Ever since they were first put on the market in the early 1990s, gentically mondified (GM, 轉(zhuǎn)基因) foods have been increasingly developed and marketed in many countries in the word,mainly on the basis of their promise to end the worldwide food crisis. But can GM technology solve world hunger problems? Even if it would ,is it the best solutiorr?
Despite what it promiises,GM  technology actually has not increased the production potential    of any corp. In fact
Studies show that the most  crown GM croo.
GM soybeans, has suffered reduced productivity. For instance, a report than analysed nearly two decades of research on mojor GM food crops shows that GM engineering has failed to significantly increase US crop production.
Something else, however, has been on the rise, While GM seeds are expensive, GM companics tell farmers that they will make good profits by saving money on pesticides（殺蟲劑）. On the contrary, US government data show that GM crops in the US have produced an overall increase in pesticide use compared to traditional crops. “ The  promise was that you could use less chemicals and boost production. But nether is true,” said Bill Christison, President of the US National Farm Coalition.
At the same time, the authors of the book World Hunger: Twelve Myths argue that there actually is more than enough food in the world and that the hunger crisis is not caused by production, but by problems in food distribution and politics. These indeed deserve our efforts and money. Meanwhile, the rise in food prices results from the increased use of crops for fuel rather than food, according to a 2008 World Bank report.
As a matter of fact ,scientists see better ways to feed the world. Another World Bank report concluded that GM crops have little to offer to the challenges of worldwide poverty and hunger, because better ways out are available, among which “green” farming is supposed to be the first choice.
小題1:The author develops the second paragraph mainly       .            
A．by classificationB．by comparison
C．by exampleD．by process
小題2:What does the underlined word “boost ” in the third paragraph probably mean?
A．Control.B．EvaluateC．Obtain.D．Increase.
小題3: GM companies promise farmers that they will benefit from ______________.   
A．practicing “green” farmingB．use of less chemicals
C．fair distribution of their cropsD．using more crops for fuel
小題4:Which of the following best describes the attitude of the author towards GM technology?
A．OptimisticB．DefensiveC．DisapprovingD．Casual

小題1:C
小題2:D
小題3:B
小題4:C
略
練習(xí)冊系列答案
相關(guān)習(xí)題

科目：高中英語 來源：不詳 題型：閱讀理解

Making greener choices and encouraging healthy lifestyles can promote your health and benefit the environment．Here are some guidelines to follow:
Choose foods thoughtfully
Americans have never had such a variety or abundance of food to choose from．Besides so many choices, we now hear about our "food print", the amount of land needed to supply one person's nutritional needs for a year．Do we buy cherry tomatoes from Mexico or tomatoes grown locally in a hothouse? Do．we get the Granny Smiths from the fanners' market or the supermarket? Is organic produce healthier for us and the planet?
These are very complex issues that require analysis of many criteria, including the energy used in producing and transporting the food, as well as the type of soil and methods of raising the food．
Despite the complexities, there are some general guidelines you can follow．For instance, eat less meat or eat low on the food chain．Your doctor may have recommended you to restrict your consume red meat because of its too much fat content．Beyond that, there are environmental reasons, too. Raise food animals contributes substantially to climate change because a meat-based diet requires more land, energy and water than a plant - based one．
Drinking plenty of fluids is significant during hot weather or when exercising．But is bottled water the way to go? You may not think so when seeing the true costs．Based on a survey, manufacturing the 30 - plus billion plastic water bottles can produce more than 2．5 million tons of carbon dioxide and use here times the amount of water in the bottle．Adding in transportation, the energy used comes to over 50 million barrels of oil equivalent （等價(jià)物）．Consequently, skip the bottled water and drink tap water, both at home and at restaurants．Additionally, bottled water is not necessarily cleaner than tap.
小題1:In Paragraph 2 the author puts forward three questions mainly _____．
A．to prove Americans have less food to choose from
B．to show us the shopping habits of most Americans
C．to indicate Americans tend to buy food from abroad
D．to remind people to reconsider their food purchase
小題2:The doctor recommends eating less red meat partly because _____．
A．it contains too much fatB．it costs a lot in transportation
C．it is too low on the food chainD．it isn't related to climate change
小題3:According to the text, which of the following is true?
A．Americans all prefer to buy cherry tomatoes from Mexico．
B．The plant - based diet is responsible for the climate change．
C．Americans have a variety of food to choose from．
D．Organic produce is the only choice for Americans．
小題4:Based on the last paragraph, we know that _____．
A．bottled water is cleaner than tap water
B．tap water is economical as well as eco - friendly
C．bottled water is more available than tap water
D．tap water uses one - third the cost of bottled water
小題5:What is the best subtitle for the last paragraph?
A．Skip bottled water, carry tapB．Drink bottled water
C．Produce plastic water bottlesD．Save water resources

查看答案和解析>>

科目：高中英語 來源：不詳 題型：閱讀理解

Is there anything more important than health? I don’t think so. “Health is the greatest wealth.” wise people say. You can’t be good at your studies or work well when you are ill.If you have a
headache, toothache, backache, earache or bad pain in the stomach, if you complain of a bad cough, if you run a high temperature and have a bad cold, or if you suffer from high or low blood pressure, I think you should go to the doctor. The doctor will examine your throat, feel your pulse, test your blood pressure, take your temperature, sound your heart and lungs, test your eyes, check your teeth or have your chest X-rayed. After that he will advise some treatment, or some medicine. The only thing you have to do is to follow his advice.    
Speaking about doctor’s advice, I can’t help telling you a funny story. An old gentleman came to see the doctor. The man was very ill. He told the doctor about his weakness, memory loss and serious problems with his heart and lungs. The doctor examined him and said there was no medicine for his disease. He told his patient to go to a quiet place for a month and have a good rest. He also advised him to eat a lot of meat, drink two glasses of red wine every day and take long walks. In other words, the doctor advised him to follow the rule: “Eat with pleasure, drink with pleasure and enjoy life as it is.” The doctor also said that if the man wanted to be well again, he shouldn’t smoke more than one cigarette a day. A month later the gentleman came into the doctor’s office. He looked cheerful and happy. He thanked the doctor and said that he had never felt a healthier man.“ But you know, doctor,” he said, “it’s not easy to begin smoking at my age.”
小題1:The writer thinks that_____.
A．health is more important than wealthB．work is as important as studies
C．medicine is more important than pleasureD．nothing is more important than money
小題2: The doctor usually tells his patient what to do______.
A．without examining the patientB．a(chǎn)fter he has examined the patient
C．if the patient doesn’t take medicineD．unless the patient feels pain
小題3: The underlined part means “______”.
A．he was feeling better than everB．he wasn’t a healthy man
C．he was feeling worse than beforeD．he will be well again
小題4:From the last sentence of the passage, we learn the man_______ before the doctor told him not to smoke more than one cigarette a day.
A．was a heavy smokerB．didn’t smoke so much
C．didn’t smokeD．began to learn to smoke
小題5: Which of the following is NOT true?
A．The doctor usually tests his/her blood pressure when a person is ill.
B．The man told the doctor he couldn’t remember things.
C．The man thanked the doctor.D．The man didn’t follow the doctor’s advice.

查看答案和解析>>

科目：高中英語 來源：不詳 題型：閱讀理解

Doctors say anger can be an extremely damaging emotion, unless you learn how to deal with it. They warn that anger can lead to heart disease, stomach problems, headaches, emotional    probems and possibly cancer.
Anger is a normal emotion that we all feel from time to time. Some people express anger openly in a calm reasonable way. Other burst with anger, and scream and yell(咆哮).But other people keep their anger inside. They can not or will not express it. This is called repressing anger.
For years many doctors thought that repressing anger was more dangerous to a person's health than expressing it. They said that when a person is angry,the brain releases the same hor-mones(荷爾蒙).They speed the heart rate, raise blood pressure, or sugar into the blood, etc. In general the person feels excited and ready to act.
Some doctors say that both repressing and expressing anger can be dangerous. They believe that those who express anger violently may be more likely to develop heart disease, and they believe that those who keep their anger inside may face a greater danger of high blood pressure.
Doctors say the solution(解決辦法) is learning how to deal with anger. They say the first step is to admit that you are angry and to recognize the real cause of the anger, then decide if the cause is serious enough to get angry about. If it is, they say,“Do not express your anger while angry. Wait until your anger has cooled down and you are able to express yourself calmly and reasonably.”
Doctors say that a good way to deal with anger is to find humor in the situation that has made you angry. They said that laughter is much healthier than anger.
小題1:“Damaging emotion” means that _________.
A．the emotion is harmless
B．the emotion is harmful
C．the feeling is very strong
D．the feeling is hard
小題2: What statement is right?
A．Were you angry, you would be cancered(得癌癥).
B．Once you are angry, you must be cancered.
C．Angry as you are often, you can't be cancered.
D．Anger may cause you a cancer.
小題3: Expressing anger violently _________ repressing it according to some scientists.
A．is just the same as
B．is more harmful than
C．is no better than
D．is much better than
小題4:According to the author, you'd better _________.
A．never be angry
B．cool it down before you express it
C．laugh and laugh when you get angry
D．a(chǎn)dmit you are wrong when you are angry

查看答案和解析>>

科目：高中英語 來源：不詳 題型：閱讀理解

When thinking about quitting(停止) smoking…
List all the reasons why you want to quit. Every night before going to bed, repeat one of the reasons 10 times.
Decide positively that you want to quit. Try to avoid negative thoughts about how difficult it might be. Develop strong personal reasons as well as your health and responsibility to others. For example, think of all the time you waste taking cigarette breaks, rushing out to buy a pack, hunting a light, etc. Set a date for quitting --- perhaps a special day like your birthday, a holiday. If you smoke heavily at work, quit during your vacation. Make the date seriously, and don't let anything change it. Begin to condition yourself physically; start a modest (適當(dāng)?shù)? exercise; drink more water; get plenty of rest.
Immediately after quitting...
The first few days after you quit, spend as much free time as possible in places where smoking is prohibited, e.g. libraries, museums, theatres, department stores, etc.
Drink large quantities of water and fruit juice. Try to avoid wine, coffee, and other drinks which remind you of cigarette smoking.
Start a conversation with someone instead of a match for a cigarette.
If you miss the feeling of having a cigarette in your hand, play with something else - a pencil, a pen, a ruler. If you miss having something in your mouth, try a fake (仿制的) cigarette.
小題1:According to the passage, which of the following statements is true?
A．Whenever you feel like a cigarette, try to forget it by sleeping.
B．Try to start a conversation before asking for a light.
C．If you miss the feeling of having a cigarette in your mouth, play with a pen.
D．Every night before going to bed, repeat all the reasons 10 times.
小題2: From the passage, we know smokers __________.
A．should drink a lot of coffee B．have to stop to smoke from time to time
C．should drink a lot of wine D．should not do any exercise
小題3:According to the passage, what does the underlined word “prohibited” mean?
A．forbiddenB．a(chǎn)llowedC．receivedD．welcomed
小題4: If the passage is in a newspaper, which section is it in?
A．SportsB．NewsC．HealthD．Culture

查看答案和解析>>

科目：高中英語 來源：不詳 題型：閱讀理解

A number of scientific studies have suggested that repeatedly heading a football could increase the risk of developing dementia (癡呆癥) in later life.
In 2002, former England international footballer Jeff Astle died aged 59. A coroner (驗(yàn)尸官) said that Astle died from a brain disease likely to have been caused by “repeated small damages to the brain” related to heading a heavy leather football.
Dr. Scott Delaney, research director of emergency medicine at McGill University Health Center in Montreal, Canada, has also researched soccer-related head injury and agrees that head-to-head or elbow-to-head blows are the real risk.
In 2007, Delaney carried out a study on footballers aged between 12 and 17 that showed they were half as likely to be concussed (使腦部受到震蕩) wearing headgear (帽) than without.
He said youngsters have a higher risk of head injury than adults because their heads are thinner and less able to absorb shock. To make matters worse, their neck muscles aren’t as well developed and they often lack the correct heading technique that can help throw away the force of the ball.
Delaney recommends that children wear headgear when playing football and says his two eldest children wear head protection playing the sport. But he admits that children can be unwilling to be the first to wear head protection—especially when their football heroes play without it.
While headgear can protect footballers from being concussed during a match, no one knows the long-term effects of repeated “sub-concussive” blows to the head.
Delaney says that while there is indirect evidence that a career in soccer can lead to dementia, no one has yet found a sure link between the two. He says proving a link would mean monitoring hundreds of footballers for three or four decades—and that would take a lot of funding.
小題1:Which might be the best title of the passage?
A．Playing football may lead to brain damage.
B．Repeated small damages to the brain.
C．Footballers should wear headgear when playing. .
D．Evidence to dementia.
小題2:According to Delaney’s research, what is the most risky injuries to head?
A．Long-term effects of blows.
B．Wearing head protection.
C．Underdeveloped neck muscles.
D．Head-to-head or elbow-to-head blows.
小題3: Children are unwilling to wear headgear because they think _____ .
A．headgear is harmful to their headsB．headgear influences their skills
C．they should follow their idolsD．they mustn’t lead the fashion
小題4:It can be inferred from the last paragraph that _____ .
A．Delaney has studied dementia for three or four decades
B．few footballers would like to be studied in the research
C．funding is important in order to carry out the research.
D．no one can find the link between playing football and dementia

查看答案和解析>>

科目：高中英語 來源：不詳 題型：閱讀理解

In the rush to get to school, you drop a piece of toast on the floor. Do you throw it away or decide it’s still OK to eat? If you’re like most people, you eat it. Maybe you follow the “5-second rule”, which claims foods are safe to eat if you pick them up within 5 seconds after dropping them.      
But you might want to think again. Scientists now say that 5 seconds is all it takes for foods to become polluted with enough bacteria（細(xì)菌）to make you sick.
Bacteria can cause many kinds of illnesses. Some kinds of bacteria can grow on food. If you eat foods on which these bacteria are growing, you can become sick.
One of these food-borne bacteria is Salmonella. It makes 1.4 million people sick every year. Salmonella is often found in raw eggs and chicken. Cooking kills these bacteria, which is why it is so important to cook eggs, chicken, and other foods thoroughly.
But how long does it take these bacteria to pollute food? A team of scientists in South Carolina did an experiment. First, they placed an amount of Salmonella on three surfaces; wood, tile (瓦片), and carpet. They placed a piece of bread and a piece of bologna（一種大紅腸）on each surface for 5, 30, or 60 seconds. After just 5 seconds, both the bread and the bologna picked up enough bacteria to make you sick.
So, forget the 5-second rule. If your toast drops on the floor, throw it away and get another piece of clean toast. And this time, be careful not to drop it!
小題1:In which part of a newspaper can you most probably find this passage?
A．CultureB．HealthC．AdvertisementD．Technology
小題2:After dropping a piece of toast, a person who follows the “5-second rule” will         .
A．throw away dirty toast immediately and go away
B．pick up the toast as quickly as possible and eat it
C．eat the toast within 5 seconds and feel pleased
D．get another piece of clean toast quickly and eat it
小題3:The scientists in South Carolina did the experiment to __________ .
A．see how quickly bacteria can pollute food
B．show that the 5-second rule is correct
C．see how harmful bacteria are to people’s health
D．show that bacteria grow at different speeds on different foods

查看答案和解析>>

科目：高中英語 來源：不詳 題型：閱讀理解

Doctors have known for a long time that extremely loud noises can cause hearing damage or loss.The noise can be the sound of a jet airplane or machines in factories of loud music or other common sound at home and at work. A person only needs to hear the noise for little mire than one second to be affected.
An American scientist has found that using aspirin (阿斯匹林) increase the temporary (暫時(shí)的)hearing loss or damage from loud noise. He did an experiment using a number of students at a university who all had normal hearing. He gave them different amounts of aspirin for different periods of time, then he tested their hearing ability. He found that students who were given four grams of aspirin a day for two days suffered much greater temporary hearing loss than those who did not use aspirin. The hearing loss was about two times as great.
The scientist said millions of persons in the U.S. use much larger amounts of aspirin than were used in his experiment. He said these persons face a serious danger of suffering hearing loss from loud noise.
小題1:.
.Doctors have long known that__________.
A．one may lose his hearing when he hears a terribly loud noise.
B．one may become deaf when he hears a loud noise.
C．loud noises can cause damage to the hearing of the young people only
D．common sounds at home are not harmful to the ear
小題2:.
.One conclusion you can draw from the passage is that aspirin________.
A．makes hearing damage from loud noise worse
B．should never be taken more than four grams
C．can damage one’s hearing when it is given more than four grams daily
D．a(chǎn)lways increases hearing loss by two times
小題3:.
. The American scientist did his experiment in order to find ________.
A．how much aspirin would affect a person’s hearing
B．how much aspirin should be given in the treatment of the patients with hearing damage from loud noise
C．whether aspirin would increase the temporary hearing damage from loud noises
D．whether the people who had hearing damage should use aspirin

查看答案和解析>>

科目：高中英語 來源：不詳 題型：閱讀理解

No one really knows how and why people change as they get older. Also, no theory sufficiently explains all the changes of the aging process. Aging is a complex and varied process that varies in how it affects different people and organs. In fact, even in one person , different organ systems “age “ at a different rate.
At a certain point in our lives our body systems will begin to weaken . It may become more difficult for us to see and hear. The slow change of aging causes our bodies to lose some of their ability to bounce back from disease and injury. In order to live longer , we have always tried to slow or stop this change that leads us toward the end of our lives.
Many factors decide our health . A good diet plays an important role. The amount and the type of exercise we get are another two factors. Our living condition is yet another. But scientists studying the aging problem want to know: Why do people grow old? They hope that by studying the aging medical science they may be able to make the length of life longer.
There is nothing to be afraid of as the old age comes. Many consider the later part of life to be the best time for living. Physical activity may become less, but often we get better understanding of the world and ourselves.
What we consider the old age now may only be middle-aged some day soon. Who knows ,with so many advances in medical science happening so quickly, life length may one day be measured in centuries ,rather than in years!
小題1:The underlined phrase “bounce back ”means “__________.”
A．jump backwardB．run fastC．preventD．recover
小題2:In order to make people live longer, scientists _______according to the text.
A．teach people how to eat properly
B．discover how important the exercise is to one’s health
C．study the ways to slow or stop the process of aging
D．invent new medicine to slow down the process of aging
小題3: Many consider the later part of life to be the time of living because they__________.
A．consider their lives have been very successful
B．have come through the battle of life safely
C．know more about themselves and the outside world
D．can have a good rest and enjoy themselves
小題4:How many factors which decide our health are mentioned in the text?
A．TwoB．FourC．FiveD．Six

查看答案和解析>>

同步練習(xí)冊答案