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题目材料:

The passage suggests which of the following about the effect of fluoride on humans?
  • AThe effect of fluoride intake from water and air is relatively difficult to monitor.
  • BAn intake of 4 milligrams over a long period of time usually leads to a skeletal disorder in humans.
  • CAn intake of slightly more than 4 milligrams for only a few months is not likely to be life-threatening.

C显示答案

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