Researchers warn (against) taking (large numbers of) vitamin A pills, because the tablets contain a form of (the chemical) flint

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问题 Researchers warn (against) taking (large numbers of) vitamin A pills, because the tablets contain a form of (the chemical) flint that can be extremely toxic (with high doses).

选项 A、against
B、large numbers of
C、the chemical
D、with high doses

答案D

解析
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