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1 . 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 |
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2019-02-11更新
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576次组卷
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4卷引用：【市级联考】江苏省常州市2019届高三教育学会学业水平监测（含听力）英语试题
