2. 外语
  3. Mercury is the nearest planet to the sun and its period of______is 88 days.

Mercury is the nearest planet to the sun and its period of______is 88 days.

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问题 Mercury is the nearest planet to the sun and its period of______is 88 days.
选项 A、movement
B、evolution
C、return
D、revolution
答案D
解析 本题空格处是说它的公转期是88天。revolution“革命，公转”，如：therevolution of the moon round the earth(月球绕地球转)。其他三项movement“运动”，evolution“进化”，return“返回”都不正确。
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