_________, meteorologists hope to learn how to keep its damage to a minimum.

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问题 _________, meteorologists hope to learn how to keep its damage to a minimum.

选项 A、Lightning studied by
B、Lightning is studied by
C、The study of lightning
D、By studying lightning

答案D

解析 “by+分词”结构做方式状语。例如：She earns her living by selling insurance。

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专业英语四级

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