2. 外语
  3. Anything that is dropped from a height falls towards the center of the earth because of the pull of______.

Anything that is dropped from a height falls towards the center of the earth because of the pull of______.

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问题 Anything that is dropped from a height falls towards the center of the earth because of the pull of______.
选项 A、weight
B、attraction
C、gravity
D、density
答案C
解析 gravity n.重力，地心引力；严肃：严重(性)。weight n．重量，重力；重压，负担；重要性，价值。attraction n.吸引，吸引力；具有吸引力的人或东西。density n.密度；密集，稠密。
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