第17题: [单项选择]Difference in position 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 form D. constitute 参考答案:B 答案解析:画线词account for的意思相当于B.explain,即“可以解释为。”该句的题意为:氧原子和氢原子所处位置的不同是不同形式冰块晶体结构多样化的主要原因。故正确答案为B。辨义:A.are cau