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【单选题】

Personal electronics are the worst because_________.

A.
they don't provide exercise
B.
they provide a mental break
C.
they provide a long-term distraction
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参考答案:
参考解析:
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举一反三

【单选题】Desk distraction toys are harmless because ____.

A.
they develop physical strength
B.
they provide a short-term distraction
C.
they improve circulation