B解释的理解: Enzymes are the organism’s attempt to metabolize the chemical irritant, or render the chemical irritant harmless. Enzymes are the organism’s attempt to metabolize, or render harmless, the chemical irritant. 同时,enzymes可以跟attempt平衡.因为sth is sth(noun is noun) 所以:ets The noun attempt could follow organism’s; also, it would parallel the noun enzymes, and parallelism is needed here because the sentence uses the linking verb are to equate enzymes and attempt.
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