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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