C.chose a junior partner to work with.
D.decided to give up medicine for faith.
第三篇
Arctic Melt
Earth's North and South Poles are famous for being cold and icy. Last year, however, the amount of ice in the Arctic Ocean fell to a record low.
Normally, ice builds in Arctic waters around the North Pole each winter and shrinks during the summer. But for many years, the amount of ice left by the end of summer has been declining.
Since 1979, each decade has seen an 11.4 percent drop in end-of-summer ice cover. Between 1981 and 2000, ice in the Arctic lost 22 percent of its thickness -- becoming 1.13 meters thinner.
Last summer, Arctic sea ice reached its skimpiest levels yet. By the end of summer 2007, the ice had shrunk to cover just 4.2 million square kilometers. That's 38 percent less area than the average cover at that time of year. And it's a very large 23 percent below the previous record low, which was set just 2 years ago. This continuing trend has scientists concerned.
There may be several reasons for the ice melt, says Jinlun Zhang, an oceanographer at the University of Washington in Seattle. Unusually strong winds blew through the Arctic last summer. The winds pushed much of the ice out of the central Arctic, leaving a large area of thin ice and open water.
Scientists also suspect that fewer clouds cover the Arctic now than in the past. Clearer skies allow more sunlight to reach the ocean. The extra heat warms both the water and the atmosphere. In parts of the Arctic Ocean last year, surface temperatures were 3.5℃Celsius warmer than average and 1.5℃ warmer than the previous record high.
With both air and water getting warmer, the ice is melting from both above and below. In some parts of the Beaufort Sea, north of Alaska and western Canada, ice that measured 3.3m thick at the beginning of the summer measured just 50 centimeters by season's end.
The new measurements suggest that melting is far more severe than scientists have seen by just looking at ice cover from above, says Donald K. Perovich, a geophysicist at the U. S. Army Cold Regions Research and Engineering Laboratory in Hanover, N.H.
Some scientists fear that the Arctic is stuck in a warming trend from which it may never recover.
41.Which of the following is closest in meaning to the word "build" in the first sentence of the second paragraph?
A.Construct.
B.Extend.
C.Create.
D.Expand.
42.What is the ice cover in the Arctic by the end of 2007 summer?
A.4.2 million square kilometers.
B.11.4 million square kilometers.
C.1.13 million square kilometers.
D.38 million square kilometers.
43.What are the reasons for the ice melt according to the scientists?
A.Strong winds and clear skies.
B.Long summer and short winter.
C.Open water and thin ice.
D.Light clouds and light winds. www.lexue88.com
44.Why is the ice melting from both above and below?
A.Because extra heat warms the air.
B.Because extra heat warms the water.
C.Because the temperature above the water is higher.
D.Both A and B.
45.What can be a possible title for the passage?
A.What are scientists looking for in the Arctic Ocean?
B.What are scientists doing in the Arctic Ocean?
C.Why are scientists worrying about the Arctic Ocean?
D.Why are scientists interested in the Arctic Ocean?
第5部分：补全短文(第46～50题，每题2分，共10分)
下面的短文有5处空白，短文后有6个句子，其中5个取自短文，请根据短文内容将其分别放回原有位置，以恢复文章原貌。
The Invader of AIDS
The invader is small, even in the microscopic world of bacteria and viruses. It is alive only in the strictest sense of the world. It had no intelligence, no means of mobility, no methods of defense in the outside world. It is fragile, easily killed by common household bleach (漂白剂) and even short periods outside the body. ________(46). It is the AIDS virus and it is a killer.
AIDS is a disease caused by a virus that breaks down part of the body’s immune system, leaving a person defenseless against a variety of unusual life-threatening illnesses.
________(47).
The body’s immune system normally provides us the weapons we need to win constant battles with invading viruses, bacteria and other invading organisms. His defense system is powerful but not perfect. ________(48). We do not even know that anything is happening.
But the AIDS virus acts differently from other invaders. It attacks the very cells that normally protect us. ________(49). It turns our own white blood cells into mini-factories or making more viruses. Each time a cell is taken over, it fills up with thousands of new viruses, dies and releases those viruses which attack more white blood cells. After enough attacks, our defense system is weakened and certain infections and conditions that we normally fight off with no problem take advantage of his weakness.
________(50). The person dies. There are no cure for AIDS, so learning about the disease and how to avoid it are our only weapons.
A.Yet it may be the most dangerous enemy in human history.
B.Whatever condition develops because of AIDS, the outcome is always the same.
C.It gets inside these cells into mini-factors or making more virus.
D.Each of the letter in AIDS stands for a work: Acquired Immune Deficiency Syndrome.
E.The patients who suffer from AIDS have characteristic features.
F.Most attacks are detected and beaten off with ease.
第6部分：完形填空(第51～65题，每题1分，共15分)
下面的短文有15处空白，请根据短文内容为每处空白确定一个最佳选项。
Seeing Red Means Danger Ahead
The color red often means danger - and by paying attention, 51 can be prevented. At railroad crossings, flashing red fights warn cars to stay back. A red light at a traffic intersection tells cars to stop, so 52 don't run into other cars.
In the future, the color red also may help prevent danger 53 construction sites. Thanks to new work by engineers, bridge supports - or other kinds of materials - could one day contain a color-changing material. It will turn red 54 a structure collapses or falls 55 . A tiny molecule may make a big difference in future warning systems.
A polymer 56 a color-changing molecule called a mechanophore turns red seconds before it snaps. The technology may one day allow damage to materials or structures to be easily 57 .
The secret behind the color-changing material is a particular type of molecule. A molecule is a group of atoms held together by 58 bonds. Molecules come in all shapes and sizes, and make up 59 you can see, touch or feel. How a molecule behaves depends on what kinds of atoms it contains, and how they're held together.
When a polymer containing a color-changing molecule called a mechanophore is about to breaks, it produces a color. When a polymer with mechanophore molecules becomes "injured" or 60 , one of the mechanophore bonds breaks and the material turns red. "It's a really simple detection method," says Nancy Sottos, one of the scientists who worked on the project. "We're 61 up this one bond, and it changes color." Sottos and her team tested the color-changing polymers in their lab. The test 62 proved encouraging.
There is a way to get rid of~ the red color: 63 . When a bright light is shone on the mechanophore, the broken bond is fixed——and the red color disappears. This "self-healing" may be a problem for engineers. They need to use the color-changer in big construction projects that will be 64 , in sunlight. And sunlight will make the mechanophore's warning system useless.
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