2. 专升本
  3. Newton proved that it is______that the moon is pulled out of a straight path and kept in orbit (轨道).

Newton proved that it is______that the moon is pulled out of a straight path and kept in orbit (轨道).

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问题 Newton proved that it is______that the moon is pulled out of a straight path and kept in orbit (轨道).
选项 A、the force of gravity (重力)
B、from the force of gravity
C、by the force of gravity
D、of the force of gravity
答案C
解析
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