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  3. Why do we laugh? For years scientists have asked themselves this question. No other animals laugh and smile--only human beings,

Why do we laugh? For years scientists have asked themselves this question. No other animals laugh and smile--only human beings,

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问题     Why do we laugh? For years scientists have asked themselves this question. No other animals laugh and smile--only human beings, so does laughter help us to【B1】______in any way? The answer seems to be that smiling and laughter help us to relax, reducing【B2】______and preventing illnesses which are caused by stress. Laughter really is the best【B3】______!
    But if you’re unhappy, it can’t do you any good to smile, can it? Not true. Apparently the【B4】______effects of smiling are just the same【B5】______you feel like smiling or not. Scientists in California asked a group of【B6】______to act five different feelings:  happiness, sadness,【B7】______, surprise and fear--just using their faces.
    Changes in their heart rate, blood pressure and temperature were【B8】______down. Most of the feelings they acted didn’t cause changes, but when they smiled their heart rate and their blood pressure went down.【B9】______. A sense of humor also helps to keep things in perspective.【B10】______.So if you find yourself in a stressful situation, try to let yourself
[giggle](咯咯地笑). A psychologist writes:  "【B11】______.If you start to laugh, in time you will actually become happier."
【B5】
选项
答案whether
解析 此处缺少连词连接后面的句子，whether...or not“不管……还是”。
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大学英语四级

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