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

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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