单选题 Questions 19 to 22 are based on the passage you have just heard.

单选题 What's the topic discussed in this passage?

A、 Why people hold back their tears.
B、 Why people cry.
C、 How to restrain one's tears.
D、 How tears are produced.

【正确答案】 B

【答案解析】[听力原文]19-22
Why do we cry? Can you imagine life without tears? Not only do tears keep your eyes lubricated, they also contain a substance that kills certain bacteria so they can't infect your eyes. Give up your tears, and you'll lose this on-the-spot defense. Nobody wants to give up the flood of extra tears you produce when you get something physical or chemical in your eyes. Tears are very good at washing this irritating stuff out. Another thing you couldn't do without your tears is cry from joy, anger or sadness. Humans are the only animals that produce tears in response to emotions, and most people say a good cry makes them feel better. Many scientists, therefore, believe that crying somehow helps us cope with emotional situations. Tear researcher, Winifred, is trying to figure out how it happens. One possibility he says is that tears discharge certain chemicals from your body, chemicals that build up during stress. When people talk about crying it out," I think that might actually be what they are doing", he says. If Fred is right, what do you think will happen to people who restrain their tears? Boys, for example, cry only about a quarter as often as girls once they reach teenage years, and we all cry a lot less now than we did as babies. Could it possibly be that we face less stress? Maybe we found another ways to deal with it, or maybe we just feel embarrassed.

[精解] 题干问：“这篇文章讨论的话题是什么?”hold back的意思是“阻止，抑制，隐瞒”，restrain的意思也是“抑制，制止”。从文中可知，“人们为什么抑制眼泪流出”和“怎样抑制眼泪”并不是这篇文章讨论的内容，所以A、C不符合题意。文章并没有说明眼泪产生的机理，只是说眼泪与健康的关系，即“人们为什么哭”符合题意。所以答案选B。

单选题 What is Winifred trying to find out?

A、 What chemicals tears are composed of.
B、 Whether crying really helps us feel better.
C、 Why some people tend to cry more often than others.
D、 How tears help people cope with emotional problems.

【正确答案】 D

【答案解析】[精解] 题干问：“威妮弗雷德试图找到什么?”材料中说“Many scientists，therefore，believe that crying somehow helps us cope with emotional situations．Tear researcher，Winifred，is trying to figure out how it happens．”这里“how it happens”指代前面说的“crying somehow helps us cope with emotional situations．”所以本题的答案选D。

单选题 What does the passage say about teenage boys and girls?

A、 Only one out of four girls cries less often than boys.
B、 Of four boys, only one cries very often.
C、 Girls cry four times as often as boys.
D、 Only one out of four babies doesn't cry often.

【正确答案】 C

【答案解析】[精解] 题干问：“关于十几岁的男孩和女孩，这篇文章是怎么说的?”材料中说“Boys，for example，cry only about a quarter as often as girls once they reach teenage years…”即十几岁的男孩哭的次数是女孩的1/4，所以答案C“女孩哭的次数是男孩的四倍”符合题意。

单选题 What's the difference between human beings and other animals when shedding tears?

A、 Only humans respond to emotions by shedding tears.
B、 Only humans shed tears to get rid of irritating stuff in their eyes.
C、 Only human tears can resist the invading bacteria.
D、 Only human tears can discharge certain chemicals.

【正确答案】 A

【答案解析】[精解] 题干问：“人类和动物在流泪的时候有什么不同?”材料说“Humans are the only animals that produce tears in response to emotions…”这和答案A的意思一致，所以本题的答案选A。