52. Professor Bidle and Paul Falkowski will probably do research into the influences of ____.

A. global warming　　　　　　　 　　　　　　B. bacteria's genetic diversity

C. glacier melting　　　　　　　　　　　　　 D. biological diversity

51. According to Paul Falkowski, the ices in Antarctica are gene banks because ____.

A. there are bacteria from African deserts　　 B. dead bacteria in them can be easily revived

C. they are fit for people to store bacteria　　 D. plenty of living bacteria can be found in them

50. Professor Bidle found that the eight-million-year-old bacteria were __.

A. alive with their genes damaged

B. as active as the one-hungred-thousand-year-old ones

C. totally the same as what they used to be

D. harder to revive than the one-hundred-thousand-year-old ones

49. The author is most probably a ______.

A. teacher　 　　　　　　 B. psychologist　 　　　 C. philosopher　 　　　 D. doctor

C

Imagine putting some bacteria in the freezer and taking them out millions of years later to find that they are still alive.

That would be similar to what happened recently, when scientists brought eight-million-year-old bacteria back to life - simply by thawing them out.

The ancient bacteria were found frozen in the world's oldest known tracts of ice, the glaciers(冰川)of Antarctica.

Professor Bidle and his colleagues found and revived(复活)two samples of bacteria from the glacial ice. The first was a hundred thousand years old, and the second was around eight million years old. The eight-million-year-old bacteria were alive. But their genes were seriously damaged from long exposure to cosmic(宇宙 )radiation, which is higher at the earth's poles.

Most of the bacteria in the samples probably blew over from African deserts, said Paul Falkowski, a scientist at Rutgers University. Once the bacteria landed on the glacier's snowy surface, they combined with the snow to form ice. "These ices are actually gene banks," he added.

As glaciers and ice caps melt as a result of increasing global warming, large amounts of bacterial genetic material might be washed into the ocean.

These bacteria might get incorporated into today's bacteria in the ocean, or living bacteria from the ice might also grow and have an important effect on the ecosystem.

"How that's going to play out, we don't know," Bidle said. He and Falkowski plan to focus their future work on how current ice melting influences modem bacteria's genetic diversity.

48. When we listen to a person talking, the most important thing for us to do is　　 __.

A. notice the way the person is talking

B. take a good look at the person talking

C. mind his tone, his posture and the look in his eyes

D. examine the real meaning of what he says based on his manner, his tone and his posture

47. The underlined word "it" in the second paragraph refers to______.

A. being friendly　 B. a bit of envy　　 C. lucky dog 　　　　　　　 D. your luck

46. According to the author, the reason why we go wrong about our friends is that　　　 .

A. we fail to listen carefully when they talk　 B. we tend to doubt what our friends say

C. people tend to be annoyed when we check what they say

D. people usually state one thing but mean another.

45. This passage is mainly about ______.

A. how to interpret what people say

B. what to do when you listen to others talking

C. why we go wrong with people and how to avoid these mistakes

D. why we go wrong with people sometimes

44. What is the source of the suggestions for fighting shyness?

A. The author of the article. 　　　　　　　　　　　　　 B. Shy men and women.

C. Doctors and psychologists. 　　　　　　　　　　　 D. Popular entertainers

B

We can make mistakes at any age. Some mistakes we make are about money. But most mistakes are about people. "Did Jerry really care when I broke up with Helen?" "When I got that great job, did Jim really feel good about it, as a friend? Or did he envy my luck? “And Paul, why didn't pick up that he was friendly just because I had a car?" When we look back, doubts like these can make us feel bad. But when we look back, it's too late.

Why do we go wrong about our friends-or our enemies? Sometimes what people say hides their real meaning. And if we don't really listen we miss the feeling behind the words. Suppose someone tells you, "You're a lucky dog, "and that's being friendly. But "lucky dog"? There's a bit of envy in those words. Maybe he doesn't see it himself. But bringing in the "dog" bit puts you down a little, what he may be saying is that he doesn't think you deserve your luck.

"Just think of all the things you have to be thankful for" is another noise that says one thing and means another. It could mean that the speaker is trying to get you to see your problem as part of your life as a whole. But is he? Wrapped up in this phrase is the thought that your problem isn't important. It's telling you to think of all the starving people in the world when you haven't got a date for Saturday night.

How can you tell the real meaning behind someone’s words? One way is to take a good look at the person talking. Do his words fit the way he looks? Does what he says agree with the tone of voice? His posture? The look in his eyes? Stop and think. The minute you spend thinking about the real meaning of what people say to you may save another mistake.

43. Which of these can you conclude from reading the article?

A. Shy people never have any fun.

B. Entertainers choose their work to fight shyness.

C. The attempt to overcome shyness is always Successful. 　.

D. The attempt to overcome shyness is always worthwhile(值得的).