B. they use microcomputers without a stop

　　C. they exercise in one place for a long time

　　D. they watch a movie while pedaling

　　65.Some astronauts feel sick on the station during the first few days because _____.

　　A. their senses stop working

　　B. they have to stand up straight

　　C. they float out of their seats unexpectedly

　　D. whether they are able to go back to the station

　　66.One of the NASA’s major concerns about astronauts is _____.

　　A. how much exercise they do on the station

　　B. how they can remain healthy for long in space

　　C. whether they can recover after returning home

　　D. whether they are able to go back to the station

　　【解析】

　　64. C细节理解题。根据第三段中“But station residents have to be careful about staying in one place too long. …You can end up with what astronauts call a carbon-dioxide headache”可知宇航员在一个地方运动久了会出现碳毒性头痛。故选C项。

　　65. D细节理解题。根据第四段中“Your inner ear thinks you’re failing. Meanwhile your eyes are telling you you’re standing straight. That can be annoying-that’s why some people feel sick.”可知宇航员在大脑接收到矛盾的信息时会感到恶心。故选D项。

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