Being alone in outer space can be fdghterdng. That is one reason why astronauts on space flight were given plenty of work to keep

　　.

　　busy. They were also in constant communication with people on the earth. However, being with people

　　.

　　you cannot get away from might be even harder than being alone.

　　Scientists have studied the reactions of men

　　.

　　one another during long voyages. They have found that the longer the voyage ___ (last), the more serious the problem of adjustment is.When men are shut up together for a long period, they begin to feel uneasy.

　　.

　　(apparent), although no one wants to be alone all the time, everyone needs some degree of privacy. When people are enclosed together, they are in

　　.

　　is called a stress situation.That means that they are under an

　　.

　　(usual) amount of pressure or stress.People who are well-adjusted are able to handle stress situations better than others. That is one reason why so much care

　　.

　　(take) in choosing our astronauts. These men undergo

　　.

　　long period of testing and training. One of the things

　　.

　　(test) is their behaviour under stress.

　　第四部分

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