As a defense against air-pollution damage, many plants and animals ________ a substance to absorb harmful chemicals. ( 章节：3 难度：3)
- A、avoid
- B、employ
- C、dismiss
- D、discard
正确答案:B
答案解析:有
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As a defense against air-pollution damage, many plants and animals ________ a substance to absorb harmful chemicals. ( 章节：3 难度：3)
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