Even at low levels, ______.

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问题 Even at low levels, ______.

选项 A、the nervous system has produced detrimental effects by lead
B、lead’s detrimental effects are producing the nervous system
C、lead produces detrimental effects on the nervous system
D、the detrimental effects produced by lead on the nervous system

答案C

解析 本题考查语序和语态。分析句子可知,前半句为状语,故空格处应是完整的句子,即应选择主谓宾等成分完整的选项。选项中所表达的含义为“铅对神经系统有损害”,所以使用主动语态,故答案为[C]项。
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