Manypeopledreamoftravelingintoouterspace．However，spend...

问题详情：

 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． Still，studies have found that most astronauts only sleep about six hours each night， even though they should have eight and a half hours．

    Brain change

    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 running 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．

（26）According to the passage， astronauts may have the flowing health problems EXCEPT______．

A． bone loss B． brain changes C． sleep disorder D． headache

（27）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

（28）Astronauts sleep in individual seeing pods to______．

A． stay warm at night

B． shut out light

C．enjoy a quiet place

D． avoid moving around

（29）The underlined word "shrinking"  in the second paragraph means______．

A．萎缩 B．改变 C．消失 D．膨胀

（30）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

【回答】

26.D   27.D   28.B   29.A   30.D

【分析】本文主要介绍了根据美国宇航局的说法，在太空中花费太多的时间可能会导致健康问题．

【解答】（26）D．细节理解题．根据文中Muscle （肌肉） and bone loss肌肉和骨丢失；Sleep disorder （混乱）睡眠障碍；Brain change脑改变．可知头痛不属于宇航员的健康问题．故选D． 27.D．细节理解题．根据文中In a weightless environment， astronauts don't need to use their muscles to support themselves，可知在失重环境下，宇航员不需要用肌肉来支撑自己．因此宇航员返回地球后可能会有肌肉问题，因为他们不需要用肌肉在太空中支撑自己．故选D． 28.B．细节理解题．根据文中Astronauts now have individual sleeping pods （分离仓） that help shut out some of the light． 可知宇航员现在有单独的睡眠舱，可以帮助遮挡一些光线．故选B． 29.A．词义猜测题．根据文中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．可知在失重环境下，宇航员不需要用肌肉来支撑自己，因此肌肉开始_____，为了保持肌肉的强壮，宇航员每天需要在*空间站上锻炼2小时左右．根据前后文含义以及结合选项可知，shrinking此处意为"萎缩"．故选A． 30.D．主旨大意题．通读全文，尤其是根据第一段中However， spending too much time in space may cause health problems， according to NASA． 可知然而，根据美国宇航局的说法，在太空中花费太多的时间可能会导致健康问题．因此可知本文主要介绍了空间健康问题的相关情况．故选D．

知识点：健康保健类

题型：阅读理解