As a defense against air-pollution damage, many plants and animals ______ a subs

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问题 As a defense against air-pollution damage, many plants and animals ______ a substance to absorb harmful chemicals.

选项 A、relieve
B、dismiss
C、release
D、discard

答案 C

解析根据句中的against及to absorb可知，许多动植物应释放某种物质才能达到此目的，release“释放”符合题意。relieve表示“减轻，救济”；dismiss表示“解散，下课，开除”；discard表示“丢弃，抛弃”。

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