2. 外语
  3. The force that makes objects fall Adown the ground is also the force Bthat keeps the planets Cin their orbits Daround the sun.

The force that makes objects fall Adown the ground is also the force Bthat keeps the planets Cin their orbits Daround the sun.

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问题 The force that makes objects fall Adown the ground is also the force Bthat keeps the planets Cin their orbits Daround the sun.
选项 A、 
B、 
C、 
D、 
答案A
解析 Down is incorrect because objects cannot fall down the ground. Objects fall from the sky to the ground. Correction: to.
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