基本信息
第二部分 语言知识及应用（共两节，满分35分）
第一节 完形填空（共10小题；每小题2分，满分20分）
阅读下面短文，掌握其大意，然后从21-30各题所给的四个选项（A、B、C和D）中，选出最佳选项，并在答题卡上将该项涂黑。
Being alone in outer space can be frightening. That is one reason why astronauts on solo（单独的） space flight were given plenty of work to keep them 21 . 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（潜水艇） voyages. It will also happen on 23 space flights in the future. Will there be special problems of adjustment under such conditions?
