What proportion of cell-phone users use their phones regularly while driving? When are drivers at greatest risk from drowsines

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问题 What proportion of cell-phone users use their phones regularly while driving?
When are drivers at greatest risk from drowsiness?

选项

答案11 p.m. to 8 a.m.

解析

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What proportion of cell-phone users use their phones regularly while driving? When are drivers at greatest risk from drowsines

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