Chronic high-dose intake of vitamin A has been shown to have______effects on bones.

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问题 Chronic high-dose intake of vitamin A has been shown to have______effects on bones.

选项 A、adverse
B、prevalent
C、instant
D、purposeful

答案A

解析 维生素A的慢性高剂量摄入被证明对骨骼有不利影响。adverse“不利的”,prevalent“流行的”,instant“立刻的,即时的”,purposeful“有目的的,故意的”。根据题意,本题选择adverse。
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