2. 外语
  3. For a long time, most doctors maintained that taking massive doses of vitamins was relatively harmless; now however, some are wa

For a long time, most doctors maintained that taking massive doses of vitamins was relatively harmless; now however, some are wa

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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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