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 movement运动。evolution进化。return返回。revolution革命，公转。
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