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四级完形填空(含答案解释)—ClozeTest31免费下载，
ymbol of the new space age.Rocket engines have 1 powerful enough to shoot astronauts 2 the earth's gravitational pull and 3 them on the moon.We have now become 4 space.
Impressive and complex 5 it may appear, the rocket, which was 6 in China over 800 years 7 , is a relatively simple dev
四级完形填空(含答案解释)—ClozeTest31
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