NASA is worried about two things: recovery time once astronauts return home, and, more importantly, how to maintain strength and fitness for the two and a half years or more that it would take to make a roundtrip to Mars.
本文讲述了在太空中的种种奇特之处以及看不见的危险。
★1.What is the major challenge to astronauts when they sleep in space?
A.Deciding on a proper sleep position.
B.Choosing a comfortable sleeping bag.
C.Seeking a way to fall asleep quickly.
D.Finding a right time to go to sleep.
答案 A [细节理解题。根据文章第二段第一句及第二句可知,像睡觉这样简单的事情,也给人带来了挑战,比如说睡姿。故选A项。]
2.The astronauts will suffer from a carbondioxide headache when ________.
A.they circle around on their bikes
B.they use microcomputers without a stop
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。根据文章第三段最后三句可知,宇航员如果在一个地方呆得太久,因为没有引力使空气流通,呼出的二氧化碳会在脑袋周围形成看不见的云状物,最终宇航员会患上二氧化碳头痛症。故选C项。]
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