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2010届高考英语40分钟限时训练[5]
完形填空（时间：10分钟）
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 21 . They were also constant communication with people on the earth.
完形填空（时间：10分钟）
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 21 . They were also constant communication with people on the earth.
