C.they exercise in one place for a long time
D.they watch a movie while pedaling
答案 C [细节理解题。第三段第五句staying in one place too long可知,如果在同一个地方待太长时间,呼出二氧化碳,趋向在头上形成隐形的云,从而引起二氧化碳性头疼。可知选C。]
7.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.their brains receive contradictory messages
答D [细节理解题。由第四段可知,内耳认为你要倒下,而眼睛告诉你在直立。即:大脑接收到了恰恰相反的信息。选D。]
8.One of 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
答案 B [细节理解题。由第五段提示词more importantly可知,人们主要关心的是在飞往火星来回两年半或更多时间如何保存体力和保持健康。因此选B。]
Passage
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