单选题：WhydoesSinclairthinkboostinglevelsofNADwon'tcausemanynegativ

题目分类：英语四级
题目类型：单选题
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题目内容：

WhydoesSinclairthinkboostinglevelsofNADwon'tcausemanynegativeeffects? A．BecauseNADisanentirelynewcompoundtohuman'sbody.
B．BecauseNADcanresistchronicdiseaseslinkedtoaging.
C．BecauseNADhasbeensuccessfullytestedonmice.
D．BecauseNADnaturallyoccursinhuman'sbody.

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