C. Because

　　D. Having

　　二. 完型填空（共10小题，每小题2分，满分20分）

　　Being alone in outer space can be frightening. That is one reason why astronauts on solo (单独的) space flights were given plenty of work to keep them

　　41 . They were also in constant communication with people on the earth.

　　42

　　being with people from whom you cannot get away might be even harder than being alone. This is what happens on long submarine (潜水艇) voyages. It will also happen on

　　43

　　space flights in the future. Will there be special problem of adjustment under such conditions?

　　Scientists have studied the reactions of men to one another during long submarine voyages. They have found that the longer the voyage lasts, the more serious the problem of

　　44

　　is. When men are

　　45

　　together for a long period, they begin to feel uneasy. Everyone has little habits of speaking and behaving that are ordinarily acceptable. In the limited space over a long period of time, however, these little habits may become very

　　46 .

　　Apparently, although no one wants to be

　　47

　　all the time, everyone needs some degree of privacy. When people are enclosed together, they are in what is called a stress situation. That means that they are under an unusual amount of

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