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  3. Another thing an astronaut has to learn about is eating in space. Food is weightless, just as men are. Food for space has t

Another thing an astronaut has to learn about is eating in space. Food is weightless, just as men are. Food for space has t

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问题     Another thing an astronaut has to learn about is eating in space. Food is weightless, just as men are.
    Food for space has to be packed in special ways. Some of it goes into tubes that a man can squeeze into his mouth. Bite-sized cookies are packed in plastic.
    There is a good reason for covering each bite. The plastic keeps pieces of food from traveling in the spaceship. On the earth very small pieces of food would simply fall to the floor. But gravity doesn’ t pull them to the floor when they are out of the plastic in a spaceship. They move here and there and can get into a man’ s eyes or into the spaceship’ s instruments. If any of the instruments is blocked, the astronauts may have trouble getting safely home.
    As astronauts travel on longer space trips, he must take time to sleep. An astronaut can fit himself to his seat with a kind of seat belt. Or, if he wants to, he can sleep in a sleeping bag which is fixed in place under his seat. But be careful he must put his hands under the belt when he goes to sleep. This is because he is really afraid that he might touch one of controls that isn’ t supposed to be touched until later.
In a spaceship, astronauts can______.
选项 A、walk just as they do on the earth
B、not eat anything because it’s dangerous
C、control the spaceship when they are sleeping
D、not litter small things or it will make trouble
答案D
解析 推理判断题。根据常识可知，在太空中，由于失重，宇航员不可能像在 地球上一样行走，所以A项错误。根据第三段可知，食物在太空中会失重，吃东西就 会变得非常困难，但不存在危险，所以B项也错误。根据第三段可知，为了防止在睡 眠中不小心触摸控制键，宇航员要将双手放在安全带下。因此他睡着的时候是不能 控制宇宙飞船的，所以C项也错误。根据第二段内容可知，为了防止失重的小东西飞 到人眼睛里或仪器中，宇航员是不能到处乱扔东西的，所以D项正确。
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