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 形近词词义辨析。relieve“解除，减轻”；release“释放”；dismiss“解散，解雇”；discard“抛弃，丢弃”。句意：作为对空气污染的防御，许多植物和动物能够释放一种物质来吸收有害的化学物质。只有选项release符合句意。故答案为B。
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