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第1题

We can conclude from the passage that ________. A) while pushing asteroids off course nuclear weapons would destroy the
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第2题

What do people think of the suggestion of using nuclear weapons to alter the courses of asteroids? A) It sounds practic
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第3题

What do scientists say about the collision of an asteroid with Earth? A) It is very unlikely but the danger exists.
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第4题

What does the passage say about asteroids and meteoroids? A) They are heavenly bodies different in composition. B)
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