题目

阅读理解     Many people dream of traveling into outer space. However, spending too much time in space may cause health problems, according to NASA. That's why astronauts shouldn't spend more than six months on the International Space Station(ISS)at a time.     Muscle(肌肉)and bone loss     In a weightless environment, astronauts don't need to use their muscles to support themselves, so their muscles start shrinking. To keep their muscles strong, astronauts need to exercise about 2 hours each day on the ISS.     Sleep disorder (混乱)     In space, the sun rises every 90 minutes. It is hard for astronauts to get used to this light-dark cycle when they sleep. Also, they need to sleep in a sleeping bag that is fixed to a wall, and it is uncomfortable.     Astronauts now have individual sleeping pods(分离仓)that help shut out some of the light. Sill, studies have found that most astronauts only sleep about six hours each night, even though they should have eight and a half hours.     Brain changes     Scientists have found that the position of the brain changes during spaceflight. It can affect how the brain deal with how we see, stay balanced and move around. That's why some astronauts can't control their movement and balance after returning to the Earth. Scientists have also found that astronauts may get used to this change after going on more spaceflights. But they still need to do more research. （1） According to the passage, astronauts may have the following health problems EXCEPT ____________. A . bone loss B . brain changes C . sleep disorder D . headache （2） Astronauts may have muscle problems after returning to the Earth because_________. A . they seldom walk while in space B . they are too busy to exercise in space C . they don't have enough room to exercise in space D . they don't need to use their muscles to support themselves in space （3） Astronauts sleep in individual sleeping pods to ________________. A . stay warm at night B . shut out light C . enjoy a quiet place D . avoid moving around （4） The underlined word "shrinking" in the second paragraph means ________________. A . 萎缩 B . 改变 C . 消失 D . 膨胀 （5） The best title of this passage is ________________. A . Sleep Disorder in Space B . Brain Changes in Space C . Muscle and Bone Loss in Space D . Health Problems in Space 答案： D D B A D

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