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¡¡¡¡Directions:For each blank in the following passage there are four words or phrases marked A,B,C and D.Fill in each blank with the word or phrase that BEST fits the context.

¡¡¡¡Being alone in outer space can be frightening.That is one reason why astronauts on solo (µ¥¶ÀµÄ) space flights were given plenty of work to keep them21.They were also in constant communication with people on the earth.22,being with people from whom you cannot get away might be even harder than being alone.This is what happens on long submarine (DZˮͧ) voyages.It will also happen on23space flights in the future.Will there be special problems 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 of24is.When men are25together 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 very26.

¡¡¡¡Apparently,although no one wants to be27all 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 of28or stress.

¡¡¡¡People who are wellª²adjusted are able to29stress situations better than others.That is one reason why so much care is taken in30our astronauts.These men undergo a long period of testing and training.One of the things tested is their behavior under stress.

¡¡¡¡()21.A.tiredB.asleepC.consciousD.busy

¡¡¡¡()22.A.So farB.After allC.HoweverD.Therefore

¡¡¡¡()23.A.longB.fastC.dangerousD.direct

¡¡¡¡()24.A.fuelB.entertainmentC.adjustmentD.health

¡¡¡¡()25.A.shut upB.held upC.brought upD.picked up

¡¡¡¡()26.A.pleasingB.annoyingC.commonD.valuable

¡¡¡¡()27.A.noisyB.aloneC.personalD.sociable

¡¡¡¡()28.A.emphasisB.conflictC.powerD.pressure

¡¡¡¡()29.A.handleB.createC.affectD.investigate

¡¡¡¡()30.A.becomingB.choosingC.orderingD.promoting