◎ 题干
The pull of gravity depends upon size, _______, upon mass. An object, whether its mass is big or small on the earth, ________in weightless conditions, like the outer space.     
[     ]

A. or rather; floats    
B. rather than; flies  
C. to be more exact; flies  
D. other than; floats

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◎ 解析
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◎ 知识点
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