Once out of the earth’s gravity, the astronaut is ________ by the problem of weightlessness.

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• You're busy filling out the application form. for a position you really need; let's assume you once actually completed a couple of years of college work or even that you completed your degree.

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• __________most of the earth‘s surface is covered by water， fresh water is very rare and precious．

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• 听力原文：I do think you ought to get a small computer for your business. It would do most of the routine tasks in a tenth of the time you spend on them now. Then you'd have time to do other things. You'd soon wonder how on earth you ever managed with-out one.

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• Viewed from a star in some other comer of the galaxy, Earth would be a speck, a faint blue dot hidden in the blazing light of our sun. While our neighbors Venus and Mars would reflect a fairly even glow, Earth would put on a little show. Earth's light would brighten and dim as it spins, because oceans, deserts, forests and clouds—which are all too small to be seen from such a distance-reflect varying amounts of sunlight. The variations, it turns out, are so strong and distinctive that surprising amount of information could be taken from a simple ebb and flow of light. Scientists at Princeton University and the Institute for Advanced Study conducted a detailed study of Earth's reflections as a way for human scientists to learn about distant planets that may be like our own.

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