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  3. The whole world seemed to be black, black nothingness. The sky was black with bright, shining stars that never【C1】______. The su

The whole world seemed to be black, black nothingness. The sky was black with bright, shining stars that never【C1】______. The su

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问题     The whole world seemed to be black, black nothingness. The sky was black with bright, shining stars that never【C1】______. The sun, a whiter, burning disk, seemed to hang in the black velvet of the surrounding heavens. This was the scene【C2】______spread before the eyes of the first astronaut who left his spaceship to walk in【C3】______space. The name of the Russian astronaut who performed this feat was Leonov, and the date of his walk in space was March 18, 1965. Several months later a similar feat was【C4】______by the first American astronaut to walk in space. Both of these "space walkers" had spent months, 【C5】______to their flight, learning how【C6】______control their movements under the【C7】______conditions, which exist in space. Wearing their thick space suits they learned to deal with an environment where there is neither weight nor gravity, neither "up" not "down".
    We do not realize how【C8】______we depend on the earth’s gravity【C9】______we are deprived【C10】______it. Then our feet no longer stay on the ground: we【C11】______around in the air; and the【C12】______touch may【C13】______us drifting off in the opposite direction.
    In the laboratories where astronauts are trained for their journeys, they are【C14】______to conditions that【C15】______those of flight. It takes time for them to prepare for the great changes that occur in space. When the spaceship leaves Earth at a【C16】______speed, the astronauts feel【C17】______they are being crushed against the spaceship floor. Later, when they leave the zone of Earth’s gravitation, they are unable to stay in one place. Simple actions, such as eating and drinking, become very difficult to【C18】______. You may get an inkling of what the astronauts have to【C19】______with if you try to drink a glass of water while standing【C20】______your head or while lying down.
【C5】
选项 A、advance
B、beforehand
C、previous
D、junior
答案C
解析 注解：previous(常与to连用)以前的，先的：a day previous to Christmas圣诞节的前一天。
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