As a defense against air-pollution damage, many plants and animals a substance to absorb harmful chemicals. ( 章节：1 难度：3)_做题室

单项选择题As a defense against air-pollution damage, many plants and animals a substance to absorb harmful chemicals. ( 章节：1 难度：3): A、avoid; B、employ; C、dismiss; D、discard

正确答案：B
答案解析：
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