As the pressure ______, the accumulated snow is turned into ice crystal.（1991年考试

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问题 As the pressure ______, the accumulated snow is turned into ice crystal.（1991年考试真题）

选项 A、intensifies
B、magnifies
C、heightens
D、purifies

答案 A

解析该题考查后缀-ify，意为“使，让”，故intensify意为“强化，增强”；magnify意为“放大，扩大”；-en同样意为“使”，heighten意为“增高，提高”，指高度；purify意为“使净化”。

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