Though scientists get closer to understanding why we age， the reason for differe

题干

Though scientists get closer to understanding why we age， the reason for different aging rates among individuals remains only __________ understood．

A．concretely	B．thoroughly
C．vaguely	D．flexible

上一题下一题 0.4难度单项选择更新时间:2019-02-18 12:18:17

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