单选题
Differences in positions adopted by oxygen and hydrogen atoms
account for
variations in the crystalline 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】
are caused by由……引起；explain解释；derive from源自；constitute制订，组成；account for解释。
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