单选题
Differences in positions adopted by oxygen and hydrogen atoms
account for
variations in the structure of different forms of ice.
A、
are caused by
B、
explain
C、
derive from
D、
constitute
【正确答案】
B
【答案解析】
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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