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  3. In the morning of May 5 th, 1975, the astronaut named Harry Jackson was given very careful medical examination. Then he was sent

In the morning of May 5 th, 1975, the astronaut named Harry Jackson was given very careful medical examination. Then he was sent

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问题     In the morning of May 5 th, 1975, the astronaut named Harry Jackson was given very careful medical examination. Then he was sent to the launching position, where the spaceship Astra was waiting to be launched. After Harry Jackson put on his special space suit, a lift took him up to the rocket, which was 65 feet above the ground.
    The count-down started, "six, five, four, three, two, one, zero, lift off," and the rocket immediately left the earth at a very high speed.
    After two and a half minutes, the rocket was moving at 5,000 miles an hour. When the Astra was 425 miles above the earth, it stopped for 20 minutes. Then Harry Jackson left his spaceship and swam around in space. He was fixed by a life-line that would help him return to the spaceship.
    As he moved about in space, he kept taking photos with his specially-made camera of what he did and saw. Afterwards he used the life-line to pull himself back to the spaceship. Then the Astra began to fall back. Forty-eight hours after the flight had started, Harry Jackson and his spaceship fell down in the Atlantic, where a waiting helicopter picked him up.
    The flight was carried out exactly as it was planned and was really a great success. When the results of the trip was announced, the whole nation cheered for it with great joy.
The life-line was used ________.
选项 A、to keep the astronaut from floating away from the Astra
B、to help Harry Jackson to take photos
C、to keep in touch with the launching centre on the earth
D、not leave the Astra for a moment
答案A
解析 事实细节题。根据第三段最后一句可知，life-line的作用是使Jackson不至于飞离飞船，答案为A。
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