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

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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、release
C、dismiss
D、discard

答案B

解析 release"释放出";relieve"减轻(痛苦),解除(负担)";dismiss"打发走,解雇";discard"扔掉,抛弃"。句子的意思是:"作为一种免遭空气污染损害的防范措施,许多动植物释放出一种能够吸收有害化学物质的东西。"所以选A、C、D都不合适。
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