The biggest safety threat（威脅）facing airlines today may not be a man with a gun ,but the man with portable（便攜式）computer in business class .In the past 15 years ,pilots have reported about over 100 incidents that could have been caused by electro-magnetic interference(電磁干擾) .The source of this interference remain unclear ,but increasingly ,experts are pointing the blame at portable electronic devices（設(shè)備）such as portable computers ,radio and mobile telephones .
RTCA ,an organization which advises the aviation industry ,has suggested that all airlines ban, such devices from being used during “key” stages of flight ,particularly take-off and landing .Some experts have gone further ,calling for a total ban during all flights .Nowadays ,rules on using these devices are left up to airlines. And although some airlines ban passengers from using such equipment during take-off and landing ,most are not willing to exercise a total ban ,if many passengers want to work during flights .
The difficulty is understanding how electromagnetic fields might affect an aircraft’s computers .Experts know that portable devices give off radiation which affects those wave lengths which aircraft uses for communication .But because they have not been able to reproduce these effects in a laboratory ,they have no way of knowing whether the interference might be dangerous or not .
The fact that aircraft may be in trouble because of the interference raises the danger
that some people may use radio systems in order to damage navigation（導(dǎo)航）equipment .As worrying ,though ,is the passenger who can’t hear the instruction to turn off his radio because the music is too loud .
小題1:.
.What is said about over 100 aircraft incidents in the past 15 years ?
A They may have taken place during take-off and landing .
B They have been caused by the damage to the radio systems .
C They were said to have resulted from electro-magnetic interference .
D They were caused by the passengers’ portable computers .
小題2:.
. Few airlines want to refuse a total ban on their passengers because ____ .
A they have other effective safety measures to fall back on
B they don’t believe there is such a danger as radio interference
C the effect of electromagnetic interference is yet to be proved
D most passengers refuse to take a plane which bans the use of radio 
小題3:.
. Why is it difficult to see the effects of electromagnetic fields on computers ?
A Experts lack proper equipment to such research .
B It is dangerous to carry out such research on an airplane .
C It remains a question what wave lengths are to be interfered with .
D Scientists are not able to produce the same effects in laboratory .
小題4:.
It can be inferred from the passage that the author ___ .
A hasn’t formed his own opinion on this problem
B has fully understood the danger of electromagnetic interference
C regards it is as unreasonable to exercise a total ban during flight
D is in favor of banning passengers’ use of electronic devices

小題1:.C
小題1:.C
小題1:.D
小題1:.D
略
練習(xí)冊(cè)系列答案
相關(guān)習(xí)題

科目：高中英語 來源：不詳 題型：閱讀理解

Many Americans take their summer vacations in August. President Obama and his family are among them. This August the first family visited the Florida Gulf Coast. The president wants to promote tourism in the area after the BP oil spill (漏油). The first family took a ten-day vacation on Martha’s Vineyard, an island off the coast of Massachusetts.
Martha’s Vineyard is known for the sailing, sunsets and its tall cliffs overlooking the Atlantic Ocean. The island is about 13 kilometers off the coast and is less than 260 square kilometers. Homes designed like those of earlier times line the streets of Edgartown, Oak Bluffs and Vineyard Haven. These are the major towns on Martha’s Vineyard.
For most of the year, the population of Martha’s Vineyard is about 15 000. In summer, more than 100 000 people crowd the island. In addition to the Obamas, you might see some Hollywood stars and other rich and famous people. Many visitors return year after year.
During warm weather the Vineyard is a good place for many different activities. People can play golf or catch fish. They can ride in sailboats or motor boats. They can waterski and swim. They can take quiet walks along sandy beaches and among the thick green trees.
One of the popular places for families with children is the Flying Horses Carousel in Oak Bluffs. It is the oldest continually operated merry-go-round ride in the United States. The colorful wood horses that turn in a circle were created in 1876. One of the best places for children to swim is the Joseph A. Sylvia state beach. The water there is warmer and calmer. Families also enjoy the Felix Neck Wildlife Sanctuary where they can observe much of the island wildlife.
Visitors watch the sunsets sitting on the beach and on rocks in the fishing village of Menemsha. As the sun goes down in the sky it paints yellow, red, and other colors on the clouds. Fishing boats rise and fall with the waves. Bells sound to help guide the boats to land as darkness covers the water.
Historians say British mapmaker Bartholomew Gosnold first made a map of the island for the rulers of England in 1602. Gosnold named the island to honor his baby daughter, Martha. The Vineyard part of the name came from the many wild grape vines Gosnold found on the island. Later, King Charles of England gave the island to businessman Thomas Mayhew of the Massachusetts Bay Colony, whose son established the first European settlement on the island in 1642. By the middle of the nineteenth century, ships from the American mainland began bringing visitors to the island. Big hotels were built near the edge of the water. Martha’s Vineyard was on its way to becoming the visitors center that it is today.
小題1:.
We can infer that ______.
A．the BP oil spill has a negative effect on the tourism along the Florida Gulf Coast
B．the BP oil spill has contributed to the tourism along the Florida Gulf Coast
C．President Obama went to the Florida Gulf Coast to deal with the BP oil spill
D．this was the first time that President Obama and his family had taken the vacation on Martha’s Vineyard
小題2:.
Which month is the peak time for tourism in Martha’s Vineyard?
A．January. B．August. C．December. D．March,
小題3:.
If children want to see wild animals, the family should go to ______.
A．the Flying Horses Carousel B．the Sylvia state beach
C．the fishing village of Menemsha D．the Felix Neck Wildlife Sanctuary
小題4:.
Bartholomew Gosnold named the island Martha in honor of _______.
A．his motherB．the king of England
C．his daughterD．his father

查看答案和解析>>

科目：高中英語 來源：不詳 題型：閱讀理解

New archaeological discoveries suggest that trade between Europe and Asia along the Silk Road probably began in some form many centuries earlier than once thought. The findings, coupled with a widening range of scientific and historical research could add a fascinating new page to the epic (史詩) of the Silk Road.
The most surprising discovery is pieces of silk found in the hair of an Egyptian mummy from about 1000 BC, long before regular traffic on the Silk Road and at least one thousand years before silk was previously thought to be used in Egypt. Other research may extend human activity along this route back even further, perhaps a million years to the migration of human ancestors into eastern Asia.
The official origin of East-West trade along the road is usually placed in the late 2nd century BC when an agent of the Chinese Emperor Wu-di returned from a dangerous secret mission（使命）across the desert into the remote high country of Central Asia. The agent, Zhang Qian, travelled as far as Afghanistan and brought back knowledge of even more distant lands such as Persia, Syria and a place known as Lijien, perhaps Rome. Historians have called this one of the most important journeys in ancient times. His journey opened the way for what have been thought to be the first indirect contacts between the ancient world’s two superpowers, China and Rome. Chinese silk, first traded to central Asian tribes for war horses and to the Parthian for acrobats and ostrich eggs, was soon finding its way through a network of merchants to the luxury (奢侈品) markets in Rome.
But the new discoveries show that Chinese silk was apparently present in the West long before the Han emperor started organized trade over the Silk Road. The research could change thinking about the early history of world trade and provide insights into the mystery of just how and when Europe and the Mediterranean lands first became aware of the glorious culture at the other end of Eurasia.
小題1:The word “coupled” in the first paragraph could best be replaced by        .
A．combinedB．contributedC．doubledD．produced
小題2:The silk thread found in the hair of an Egyptian mummy suggests that         .
A．Egyptians had probably travelled to China to buy silk
B．new light can now be thrown on ancient trading practices
C．historical research often achieves fascinating results
D．trade along the Silk Road began earlier than once thought
小題3:Until recently historians mostly believed that trade along the Silk Road       .
A．began a million years ago
B．primarily benefited the Egyptians
C．originated in the 2nd century BC
D．extended human migration into eastern Asia
小題4:Historians have always considered Zhang Qian’s mission important because they believe       .
A．he discovered the Silk Road
B．he helped establish East-West trade
C．he travelled as far as Afghanistan
D．he brought back knowledge of Rome to the emperor

查看答案和解析>>

科目：高中英語 來源：不詳 題型：閱讀理解

Do you know how to prepare for and survive a major earthquake? According to Department of Conservation scientists, it is important to have the right answer to that question.
How to Be Prepared
Electricity, water, gas and telephones may not be working after an earthquake. The police and fire departments are likely to be tied up. You should be prepared to fend for yourself at least three days,preferably for a week. You’ll need food, water and so on. It’s also a good idea to decide ahead of time how and where your family will reunite if separated during a quake. You might choose an out-of-the-area friend or relative that family members can call to check on you.
________
If you’re indoors, stay there. Get under a desk or table. The kitchen is a particularly dangerous spot. If you’re in an office building, stay away from windows and outside walls and do not use the elevator. If you’re outside, get into the open. Stay clear of buildings, power lines or anything else that could fall on you. If you’re driving, move the car out of traffic and stop. Avoid parking under or on bridges or overpasses.
After an Earthquake
Check for fire. If you smell gas, shut off the main gas valve(閥). If there’s sign of damage to electricial wiring, shut off the power at the control box. If the phone is working, only use it in case of emergency(緊急情況). Avoid driving if possible to keep the streets clear for emergency vehicles. Be careful that things may fall out of cupboards when the door is opened, and also that chimneys can be weakened and fall with just a touch. Listen to the radio for important information and instructions. Remember that aftershocks, sometimes large enough to cause damage in their own right, generally follow large quakes. If you leave home, leave a message telling your friends and family your location.
小題1:
The underlined phrase“tend for’’ in the second paragraph probably means“ ________’’
A．look forB．take care ofC．be proud ofD．think of
小題2:
Which of the following would be the best subtitle for the third paragraph?
A．Before an EarthquakeB．After Making Preparations
C．While Staying at HomeD．During an Earthquake
小題3:
What should you do when an earthquake happens?
A．You should stay away from the kitchen.
B．You should drive on a bridge.
C．You should turn off the power.
D．You should listen to the radio frequently.
小題4:
What will probably happen after a big earthquake?
A．The local people’s life will return to normal in a week.
B．There will be more earthquakes in a short time.
C．There won’t be any earthquakes in a short time.
D．The local people will stay at home waiting for help.

查看答案和解析>>

科目：高中英語 來源：不詳 題型：閱讀理解

When it comes to protecting the privacy of their children, U.S. parents give social networks a failing grade. According to a recent survey, three out of four parents believe social networks are not doing a good job of protecting kids’ online privacy.
The survey was conducted for Common Sense Media, a nonprofit organization devoted to helping families find the right way to deal withthe world of media and technology.
Ninety-two percent of parents said they are concerned that children share too much information online, and 85 percent said they are more concerned about online privacy than they were five years ago. In other findings, Common Sense Media found that 68% of parents are not at all confident in search engines keeping their private information safe and secure and 71% of parents said the same about social networking sites.
The survey found a great deal of concern about the online geo-location services which find and show the exact position of somebody through the net. Ninety-one percent of parents said search engines and social networking sites should not be able to share the physical location of children with other companies unless the parents approve.
“The survey results present a clear divide between the industry’s view of privacy and the opinion of parents and kids,” Common Sense Media CEO and founder James Steyer said.
“American families are deeply worried about how their personal information is being used by technology and online companies, yet the companies appear to be keeping their heads deep in the sand,” Steyer said.
IT companies need to step up but parents, children, schools and government also need to do more, he said.
“Parents and kids have to educate themselves about how to protect their information,” he said. “Schools should teach all students and their parents about privacy protection.”
“And finally, policymakers have to update privacy policies for the 21st century,” he said. According to the survey, more than 60 percent of parents want the US Congress to update online privacy laws for children and teenagers.
小題1: What does the underlined part in Paragraph 6 mean?
A．Refusing to admit the problem.B．Refusing to work with others.
C．Trying to find a solution to the problemD．Trying to look deep into the problem.
小題2: According to James Steyer, the following organizations should make more contributions to protecting    
children’s online privacy except __________.
A．IT companiesB．GovernmentC．SchoolsD．Nonprofit Organizations
小題3:What can be inferred from the passage?
A．Parents are worried about social networks because they lead to the children’s failing grades.
B．Most US parents agree that the online geo-location services should be forbidden.
C．Most USparents will support a law that limits IT companies to using personal information.
D．US Congress has not yet passed any online privacy law for children and teenagers.
小題4: Which of the following may be the best title for the passage?
A．US Congress to Update Privacy Policies for 21st Century
B．Common Sense Media Warns Against Social Networks
C．US Parents Want Better Online Privacy Protection for Kids
D．Worry Grows for Problems Caused by Social Networks

查看答案和解析>>

科目：高中英語 來源：不詳 題型：閱讀理解

From James Dean to Growing Pains, Hollywood has long had a love affair with the relationship between teens and their parents. As the fascination with this relationship attests, parents play a crucial role in the development of their children's personalities.
Teenagers learn by closely observing what people around them do. Parents are literally their first teachers and serve as role models. From hygiene to habits, from time management to personal manner, parents form the foundation of their children's characteristics. These tiny individual factors on our everyday behavior collectively constitute who we are.
A second influence occurs at the spiritual level. Parental treatment of children is reflected in children's relationship with others. For example, my dad was quite angry with my study habits a few years back and lost his temper.I clearly remember that I too would easily lose my cool and shout at people, often saying things I later regretted, in those difficult days.
Parents of my fellow classmates often tend to be anxious about the studies of their children, which can lead to a lack of confidence in their children. If we are boats weathering a storm as we navigate toward maturity, then parents should be our captains. It is as easy to lead us to shipwreck as is to take us ashore safely.
To be fair, the guidance and influence of our parents are not the sole factors in molding us. There are numerous examples of teens forging their own paths and becoming something of which their parents never dreamed. Even so, parents must be a fundamental force that positively influences their children. At their best, they can help to solve teenage problems with a respect for their children's thoughts.
小題1: James Dean and Growing Pains in the first paragraph are described as follows EXCEPT    .
A．they are about love affairs in family life
B．they are mentioned at the beginning of the passage to introduce the topic
C．they reflect a very important role parents play in childhood development
D．they are typical presentations of the relationship between teens and their parents
小題2: If parents are worried about the studies of their children, their children will      .
A．easily lose their temperB．lack self-confidence
C．follow their own pathsD．tend to shout at people
小題3: We can conclude from the passage that      .
A．teens will always be what their parents expect them to
B．parents' behavior influences their children both physically and mentally
C．the guidance and influence of parents are the only factor in molding teens
D．parents should be our captains when we teens are on boats in a storm
小題4: The passage is intended mainly for      .
A．teensB．teachersC．studentsD．parents

查看答案和解析>>

科目：高中英語 來源：不詳 題型：閱讀理解

Children are losing the ability to play properly because they are being given too many toys and games, according to new research.
The studies show that children, especially those under five, are often overwhelmed and actually play less than those with fewer toys. It may even harm their development. The studies show that giving children too many toys or toys of the wrong type can actually be doing them harm. They get overwhelmed and cannot concentrate on anything long enough to learn from it.
The conclusions have been backed up by British research looking at children with relatively fewer toys, whose parents spend more time reading, singing or playing with them. It showed such children surpass(勝過) youngsters from richer backgrounds, even those who could use computers.
Some parents notice the ill effect early. Orhan Ismail, a researcher saw a change for the worse in Cameron, his 10-month-old son, after he was given a lot of toys last Christmas.
Ismail said, “ If there are too many toys in front of him, he will just keep flitting around them and then end up going off and finding something like a slipper to play with. Now we just get out one or two toys and hide the rest in a box.”
Alexander and her husband also decided to limit the toys their 6 daughters play with. She believed many toys restrict children’s imaginations. She said, “ A Barbie can only work as a Barbie. But a cardboard box can become anything. The only limitations are in the child’s mind.”
Experts hesitate to put a figure on the number of toys children should have, but many believe two dozen is enough for children of preschool age.
小題1:In the writer’s opinion, a Barbie _____.
A．can attract more attention from children than a cardboard box
B．can work more than a Barbie
C．may become anything else such as a cardboard
D．may keep children from further imaginations
小題2:Which of the following is TRUE about toys given to children?
A．too many toys will help children develop wide interests.
B．One or two toys at a time will help children concentrate.
C．Only wrong types of toys do harm to children.
D．The proper number of toys given to the children depends on their ages.
小題3:It may NOT be a good idea to ____.
A．spend more time reading or playing with children
B．choose right types of toys for children
C．a(chǎn)sk experts for the exact number of necessary toys
D．put out one or two toys and hide the rest

查看答案和解析>>

科目：高中英語 來源：不詳 題型：閱讀理解

The teacher was leaving the village, and everybody seemed sorry. The miller at Cresscombe lent him the small cart and horse to carry his goods to Christminster, the city of his destination, such a vehicle proving of quite enough size for the teacher's belongings, for his only article, in addition to the packing-case of books, was a piano that he had bought when he thought of learning instrumental music. But the eagerness having faded he had never acquired any skill in playing, and the purchased article had been a permanent trouble to him.
The headmaster had gone away for the day, being a man who disliked the sight of changes. He did not mean to return till the evening, when the new teacher would have arrived, and everything would be smooth again.
The blacksmith, the farm bailiff and the teacher were standing in confused attitudes in the sitting room before the instrument. The teacher had remarked that even if he got it into the cart he should not know what to do with it on his arrival at Christminster, since he was only going into a temporary place just at first.
A little boy of eleven, who had been assisting in the packing, joined the group of men, and said, ‘Aunt has got a fuel-house, and it could be put there, perhaps, till you’ve found a place to settle in, sir.’
‘Good idea,’ said the blacksmith.
The smith and the bailiff started to see about the possibility of the suggested shelter, and the boy and the teacher were left standing alone.
‘Sorry I am going, Jude?’ asked the latter kindly.
Tears rose into the boy’s eyes. He admitted that he was sorry.
‘So am I,’ said Mr. Phillotson.
‘Why do you go, sir?’ asked the boy.
‘Well—don't speak of this everywhere. You know what a university is, and a university degree? It is the necessary hallmark (標(biāo)志) of a man who wants to do anything in teaching. My scheme, or dream, is to be a university graduate. By going to live at Christminster, I shall be at headquarters, so to speak, and if my scheme is practicable at all, I consider that being on the spot will afford me a better chance.’
The smith and his companion returned. Old Miss Fawley's fuel-house was practicable; and she seemed willing to give the instrument standing-room there. So it was left in the school till the evening, when more hands would be available for removing it; and the teacher gave a final glance round.
At nine o'clock Mr. Phillotson mounted beside his box of books, and waved his friends good-bye.
小題1:It seemed that the teacher _____.
A．was not getting on well with the headmaster
B．had lived a rather simple life in the village
C．was likely to continue to practice playing the piano
D．would get help in the city on arriving there
小題2: The motivation of the teacher’s moving lay in his _____.
A．a(chǎn)mbitionB．devotionC．a(chǎn)dmirationD．inspiration
小題3: The boy named Jude may be described as _____. 
A．polite, generous and cheerfulB．a(chǎn)ctive, modest and friendly
C．kind, bright and helpfulD．calm, confident and humorous
小題4:In the passage the writer describes both the teacher’s _____.
A．love for music and his dislike for musical instruments
B．hard work in the village and his strong interest in city life
C．friendship with some villagers and also conflicts with others
D．eagerness to go to the city and his affection for the village

查看答案和解析>>

科目：高中英語 來源：不詳 題型：閱讀理解

1) Your teens don’t want you to be their friends. What they need is for you to be a reliable responsible role model worthy of their respect, and not some overgrown child who wears too tight jeans or T-shirts with slogans advocating the good points of 100 proof liquor.
2) Don’t debate the teen ever. If she wants to debate, suggest she sign up for the Debate Club. If you buy into their teen logic (which is basically illogic, the product of an immature brain and every extreme of emotion known to mankind) your mouth will go dry. Teens need to know that no means no. Remember when your teen was two years old and he said “no” a lot? Well now it’s your turn, particularly when your teen wants to engage in behaviors that are dangerous.
3) Don’t buy your teen a car. If you do, he will total it in record time. Guaranteed. The teen should earn the car, or at least a portion of it (and by that I don’t mean one of the tires). You know how you take much better care of an item of clothing you spent a fortune on compared to one you bought in a bargain basement? It’s the same thing, only a car can do serious damage.
4) Encourage sports participation even if your teen has two left feet. In some sports, two left feet won’t knock him out of the box, so to speak. Sports participation develops perseverance and cheerfully functioning as a team member. You also will know where your child is every day after school (on the field, that is, or at a rival school). Just make sure you root for the right team, okay? Been there, done that.
5) Let the school know you in a good way so that school personnel do not dive under the desk when you approach. If you are asked to speak at the school, your teen will feel mighty proud. If you make something for the bake sale, try to make it taste edible and if you can’t see it through, do yourself and your child a favor and buy something at the local bakery or supermarket.
6) To know your teens’ friends is to know your teens. Teens have a secret life, and a parent’s goal is to find out secrecy that is sometimes thicker than the CIA and the KGB combined. If you really want to know what your kid is up to, get to know their friends. How? By being warm and kind, and by asking questions that don’t sound like an interrogation（審訊）, but serve that purpose without their knowing it.
小題1: When your kids are doing something that might negatively affect their future, you should _____.
A．have your kids express their opinions fully and then discuss with them
B．think about how you can be their close friends
C．report that to their school immediately
D．say no and tell them that they must stop
小題2: According to the passage, as a parent, you should encourage your kids __________.
A．to wear too tight jeansB．to sign up for the Debate Club
C．to be greatly involved in sportsD．to make as many friends as they can
小題3: The underlined word “total” in the third paragraph probably means ________.
A．damageB．a(chǎn)ddC．buyD．earn
小題4: The passage mainly wants you to know that __________.
A．kids have their secrecy and freedom
B．Raising Teenagers calls for certain parenting skills
C．your teen needs some house rules
D．the family is changing

查看答案和解析>>

同步練習(xí)冊(cè)答案