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Why do we cry Can you imagine a life without tears Not only do tears keep your eyes lubricated, they also contain a (36) that kills certain (37) so they can’t infect your eyes. Give up your tears, and you lose this on the spot defense. Nor would you want to give up the flood of (38) tears you produce when you get something physical or chemical in your eyes. Tears are very good at washing this (39) 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 (40) . And mot people say a good cry makes some feel better. Many scientists, therefore, believe that crying (41) helps us cope with the emotional situations. Tear (42) ,William Fred is trying to figure out how it happens. "One (43) ", he says, "is that tears discharge certain chemicals from your body". (44) , he says. If Fred is right, (45) Boys, for example, cry only about a quarter as often as girls once they reach their teenage years. And we all cry a lot less now than we did as babies. Could it possibly be that we face less stress (46) .

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30()

A. marriage
B. married
C. marring
D. got married

Parents should ask fat children to eat foods rich in ______ instead of fattening foods.

美国授予发明者的专利数量,由1971年的56 000项下降到1978年的45 000项。美国在研究和开发方面的投入,在1964年到达其顶峰——占GNP的3%;而在1978年只是2.2%,在这期间,研究和开发费用占GNP的比重一直在下降。同一时期,前联邦德国和日本却增加了它们GNP中研究和开发费用的比重,分别增长到3.2%和1.6%。 上述信息最能支持以下哪个结论

A. 一个国家的GNP和发明数量之间有直接的关系。
B. 日本和前联邦德国在1978年比美国在研究和开发方面花费的钱多。
C. 一个国家花在研究和开发上的钱的数量,直接决定该国产生的专利数量。
D. 1964-1978年间,美国研究开发费用占GNP的比重一直高于日本。
E. 前联邦德国和日本都将很快在专利数量方面超过美国。

Why did the man fasten the end of the rope before he climbed up the ladder()

A. He was afraid that someone would steal his box.
Because he wanted to climb up along the rope.
C. He fastened the end of the rope in order to keep the box unmoved.
D. Because he wanted to prevent the box from coming down.

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