Differences in positions adopted by oxygen and hydrogen atoms account for variations in the structure of different forms of ice.

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问题 Differences in positions adopted by oxygen and hydrogen atoms account for variations in the structure of different forms of ice.

选项 A、are caused by
B、explain
C、derive from
D、constitute

答案B

解析 account for意为“解释”。A选项:由……引起。B选项:解释。C选项:来源于……。D选项:构成。
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