The passage says that people can faint if they are. If you feel faint, it is best to.

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问题 The passage says that people can faint if they are______.
If you feel faint, it is best to______.

选项 A、run about
B、lie flat
C、move slowly
D、stand up

答案B

解析开头第一句说了，晕倒的原因是大脑血压突然下降，供血量不足。这时人不能站着，否则大脑血液很难得到补充。文中也提到， If a person faints while standing，lay him down。

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