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

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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