For a long time, most doctors maintained that taking massive doses of vitamins w

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问题 For a long time, most doctors maintained that taking massive doses of vitamins was relatively harmless; now however, some are warning that excessive dosages can be______.

选项

答案 D,F

解析 however说明前后反义重复。空格体现harmless(无害的)的反义重复。healthy健康的,innocuous无害的,wasteful浪费的,toxic有毒的,inane空洞的,venomous有毒的。答案选DF。注:这里healthy和innocuous是干扰项,同表示“对身体无害的”,是正确答案的反义重复。
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