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Before his son was born, in order to meet each other, Addison made the 200-mile round-trip commute_______________.

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A．Demand a prompt response.B．Provide all the details.C．Send it by express mail.D．

A. Demand a prompt response.
B. Provide all the details.
C. Send it by express mail.
D. Stick to the point.

A．Because they lack self-discipline in their studies.B．Because they spend too muc

A. Because they lack self-discipline in their studies.
Because they spend too much time on the Internet.
C. Because they have not exerted their utmost efforts.
D. Because they have developed poor relationships with teachers.

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一个水池有两个排水管甲和乙，一个进水管丙。若同时开放甲、丙两管，20小时可将满池水排空；若同时开放乙、丙两水管，30小时可将满池水排空；若单独开丙管，60小时可将空池注满。若同时打开甲、乙、丙三水管，要排空水池中的满池水，需多少小时？（）

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以下各项最适合做本文标题的是（）。

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