Walnut trees______ environment stresses such as drought by producing significant amounts of a substance similar to aspirin.

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问题 Walnut trees______ environment stresses such as drought by producing significant amounts of a substance similar to aspirin.

选项 A、turn to
B、confirm to
C、contribute to
D、respond to

答案D

解析 考查动词短语辨析。turn to“转向;变成;求助于;致力于;开始行动”,confirm to“证实”,contribute to“有助于”,respond to“对……反应”。句意为“面对来自环境的压力,例如干旱,胡桃树会释放大量类似阿司匹林的物质”。D项最符合句意。
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