The passage says that people may faint if they are. We try to help a person who has fainted by.

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问题 The passage says that people may faint if they are______.
We try to help a person who has fainted by______.

选项 A、rubbing his head
B、returning blood to his brain
C、tightening his muscles
D、holding him in an upright (垂直) position

答案B

解析本题题干问“我们如何去帮助一个晕倒的人”。原文第1段第1句话指出人们晕倒是因为脑供血突然中断，所以去帮助一个晕倒的人就要帮助把血液回到大脑中。因此选项B．returning blood to his brain是正确答案。

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大学英语三级B级

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