The first textbook _______ for teaching English as a foreign language came out in the 16th century.

A. having written      B. to be written    C. being written     D. written

—What did you do last night??

—I______________my homework but nothing else. ?

A. did            B. was doing          C. has done       D. had done?

In the atmosphere, carbon dioxide acts rather like a one-way mirror or the glass in the roof of a greenhouse which allows the sun's rays to enter but prevents the heat from escaping.

　　 According to a weather expert' s prediction, the atmosphere will be 3℃ warmer in the year 2050 than it is today, if man continues to burn fuels at the present rate. If this warming up took place, the ice caps in the poles would begin to melt, thus raising sea level several metres and severely flooding coastal cities. Also, the increase in atmospheric temperature would lead to great changes in the climate of the northern hemisphere (北半球), possibly resulting in an alteration of the earth's chief food growing zones.

　　  In the past, concern about a man-made warming of the earth has concentrated on the Arctic because the Antarctic is much colder and has a much thicker ice sheet. But the weather experts are now paying more attention to West Antarctic, which may be affected by only a few degrees of warming, in other words, by a warming on the scale that will possibly take place in the next fifty years from the burning of fuels.

　　  Satellite pictures show that large areas of Antarctic ice are already disappearing. The evidence available suggests that a warming has taken place. This fits the theory that carbon dioxide warms the earth.

　　  However, most of the fuel is burnt in the northern hemisphere, where temperatures seem to be falling. Scientists conclude , therefore, that up to now natural influences on the weather have gone beyond those caused by man. The question is: Which natural cause has most effect on the weather?

　　  One possibility is the variable behavior of the sun. Astronomers at one research station have studied the hot spots and "cold" spots (that is, the relatively less hot spots) on the sun. As the sun rotates (使旋轉(zhuǎn)), every 27. 5 days, it presents hotter or "colder" faces to the earth, and different aspects to different parts of the earth. This seems to have a considerable effect on the distribution of the earth's atmospheric pressure, and consequently on wind circulation. The sun is also changeable over a long term: its heat output goes up and down in cycles, the latest trend being downward.

　　  Scientists are now finding shared relations between models of solar weather interactions and the actual climate over many thousands of years, including the last Ice Age. The problem is that the models are predicting that the world should be entering a new Ice Age and it is not. One way of solving this theoretical difficulty is to assume a delay of thousands of years while the solar effects overcome the inertia (慣性) of the earth's climate. If this is right, the warming effect of carbon dioxide might thus be serving as a useful opposed balance to the sun's fading heat .

It can be concluded that a concentration of carbon dioxide in the atmosphere would_________.

   A. mean a warming-up in the Antarctic

   B. raise the temperature of the earth' s surface

C. prevent the sun's rays from reaching the earth's surface

D. explain the cause of  great changes in the climate in the northern hemisphere

The article was written to explain ___________.

A. the greenhouse effect

B. the solar effects on the earth

C. the causes affecting weather

D. the models of solar-weather interactions

Although the fuel consumption is greater in the northern hemisphere, temperatures there　seem to be falling. This is__________.

A. mainly because the levels of carbon dioxide are rising

 B. partly due to changes in the output of solar energy

C. possibly because the ice caps in the poles are melting

D. only due to the effect of the inertia of the earth' s climate

On the basis of their models, scientists believe the opinion that__________.

A. the climate of the world should be becoming cooler

B. the new Ice Age will be delayed by the greenhouse effect

C. the man-made warming effect helps to increase the solar effects

D. it will take thousands of years for the inertia of the earth's climate to take effect

If the assumption about the delay of a new Ice age is correct, ____________.

A. ice would soon cover the northern hemisphere

B. the greenhouse effect could work in favor of the earth

C. the best way to overcome the cooling effect would be to burn more fuels

D. the increased levels of carbon dioxide in the atmosphere could warm up the earth even more quickly

— What happened then?

   — The Red Army _____ the bridge after they crossed it.

       A．broke into B．broke out  C．turned into       D．burned down

JINTAN,JTANGSU:The 20 students 18 boys and 2 girls — had a thousand reasons to be proud of themselves. They had just climbed their way to the top rung(階梯) out of 4 million students taking part in the Fifth National Hua Luogeng Gold Cup Mathematics Contest (競(jìng)賽)Tuesday evening.

　　The 20 gold medal winners are all primary and middle school students under the age of 14.

　　‘Many of the problems are of college level and these pupils can figure them out. It is just unbelievable! ‘said a teacher from Guangdong province.

　　Named after China’ s most famous mathematician, Hua Luogeng, the contest started in 1986, one year after his death. In less than 10 years, it has been recognized by the State Education Commission (國(guó)家)as the country’s biggest and best contest of its kind.

1. This news story is mainly about .

　　A. when the contest started

　　B. how the contest got its name

　　C. the 20 pupils who have won gold medals in the contest

　　D. the 5th National Hua Luogeng Gold Cup Mathematics Contest

2. This news story most probably appeared in a news paper in .

　　A.1995　　B. 1987　　C. 1986　　D. 1997

3 Ii can be inferred from the text that the teacher from Guangdong province .

　　A. felt proud of the gold medal winners

　　B. wondered if the students were honest

　　C. thought that the problems were too difficult for the 　students

　　D. believed that the twenty winners could go to study at university

4 The underlined phrase ‘figure out’ in the text means .

　　A .guess　　B. add up　　C. work out　　D. study

The salesman scolded the girl caught_______and let her off.

A. to have stolen      B. to be stealing　      C. to steal            D. stealing

Shishmaref, an Eskimo village on an island off northwestern Alaska, is falling into the ocean. Giant storm waves have so hit the place—once well buffered by sea ice—that villagers voted in 2002 to leave their ancestral home for the mainland. They are being called one of the first refugees（難民）of global warming. k+s-5#u 

“We tend to describe climate change in terms that are abstract—a one degree rise in temperature, an increase in greenhouse gases—but when waves wash away a village, that’s concrete and very emotional,” says Igor Krupnik, an expert at the National Museum of Natural History. “When they lose a piece of their land, they aren’t just losing a certain number of square miles. They are losing part of their history and their memory. They are losing childhood events and grandparents’ tales.”

Before temperatures began to rise in Shishmaref about 30 years ago, 20 to 30 miles of hard sea ice protected the village from powerful fall storms. But the natives say the ice doesn’t freeze as solidly or as soon as it used to and now stretches only six or seven miles, leaving the community of 600 people more exposed. Storms have swept houses into the ocean.

The villagers’ plan is to move to Tin Creek, a site on the Alaska mainland 12 miles away, and they have received $180 million from the government. Residents hope that in their new community they’ll be able to maintain their close ties, continue hunting animals, and keep fishing, much as their ancestors have done for centuries. “People are asking why the government should be spending so much money on so few people,” said a government official. “But people in Alaska are like everyone else. We want to help keep their culture alive.”

The underlined word “buffered” probably means “______”. k+s-5#u 

       A．protected  B．destroyed  C．prevented  D．damaged

From the passage what do we know about the sea ice around the village in the past?

       A．It was very thin and easily broken.

       B．It was very thick and smooth.

       C．It frozen more solidly and sooner.

       D．It frozen more slowly and solidly.

According to the passage, _____ caused the village to be in danger of disappearing.

       A．water pollution        B．global warming             

       C．a(chǎn)ir pollution            D．human’s actions

What’s the villagers’ main purpose to rebuild the community?

       A．To live more happily       B．To earn money

       C．To avoid being washed away   D．To keep their culture alive

　　When I got back home I saw a message pinned to the door ________ “Sorry to miss you; will call later.”

　　The boy wanted to ride his bicycle in the street, but his mother told him _______.

　　A. not to B. not to do C. not do it D. do not to

I’m sorry you’ve been waiting so long, but it’ll still be some time ____ Brian get back.

A. before    B. since    C. till    D. after