Differences in positions adopted by oxygen and hydrogen atoms account for variations in the crystalline structure of different f

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

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

答案B

解析 本题中,account for的意思是“解释”。四个选项中,explain的意思是“解释”,如:The price tag says $100 and you charged me for $120;how do you explain the discrep—ancy?(货物标签上写的是一百美元,你向我索价一百二十美元,这个差异该怎么解释?)。are caused by的意思是“由……引起”;derive from的意思是“源自”;constitute的意思是“制订,组成”。只有B项符合题意。
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