2. 外语
  3. Why do we cry? Can you imagine a life without tears? Not only do tears keep your eyes lubricated, they also contain a【B1】______

Why do we cry? Can you imagine a life without tears? Not only do tears keep your eyes lubricated, they also contain a【B1】______

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问题     Why do we cry? Can you imagine a life without tears? Not only do tears keep your eyes lubricated, they also contain a【B1】______ that kills certain【B2】______ 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【B3】______ tears you produce when you get something physical or chemical in your eyes. Tears are very good at washing this【B4】______ 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【B5】______ . And mot people say a good cry makes some feel better. Many scientists, therefore, believe that crying【B6】______ helps us cope with the emotional situations. Tear【B7】______ ,William Fred is trying to figure out how it happens. "One【B8】______ ", he says, "is that tears discharge certain chemicals from your body".【B9】___________________________ , he says.
    If Fred is right,【B10】_________________________ ? 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?【B11】______________________ .
【B10】
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答案what do yon think would happen to people who restrain their tears
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