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第1题

18. Some of these stars have planets orbiting them, and ______ many billions of these planets could support life. ( )(本
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第2题

17. Be careful when you ______ that vase; it will break very easily. ( )(本题2.0分) A、 operate B、 deal C、 cope
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第3题

16. This latest theory has yet to be proved but seems to offer a better explanation ________ why Flight 19 and all the
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第4题

15. If the weather ______ more favorable in the past few months, the crops would be growing still better in a few days.
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