Walnut trees __________ environment stresses such as drought by producing sig...

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问题 Walnut trees __________ environment stresses such as drought by producing significant amountsof 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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