单选题 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 travelling 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.
单选题 Why would astronauts cover each bite of food in space?
【正确答案】 B
【答案解析】事实细节题。文章第二段主要是解释食物要用塑料包起来的原因。在太空中由于不存在重力，食物就会到处移动，可能飞到人眼睛里或宇宙飞船的仪器中，引起麻烦。
单选题 In a spaceship, astronauts can ______.
【正确答案】 D
【答案解析】推理判断题。可以用排除法。在宇宙中，由于失重，宇航员不可能像在地球上一样行走，所以A不对。因为食物也像宇航员一样失重，吃东西就会变得非常困难，而不存在危险，所以B也不对。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，这样C也排除了。为了防止小东西由于失重飞到人眼睛里或机械中，宇航员是不能到处乱扔东西的，所以只有D是正确的。
单选题 In what way is food for space packed?
【正确答案】 D
【答案解析】事实细节题。第一段的最后两句指出，一些食物被放在管子里，小饼干则被用塑料包装起来。
单选题 Why does an astronaut put his hand under his belt when he sleeps?
【正确答案】 B
【答案解析】事实细节题。文章最后两句提到，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。
单选题 The best title of this article is ______.
【正确答案】 A
【答案解析】归纳概括题。文章前两段讲的是太空中“吃”的问题，最后一段讲的是太空中“睡”的问题，所以本篇文章的最佳题目应是A“太空中的吃和睡”。B、C、D都只谈了一个方面，都是片面的。