汽车自O点从静止开始在平直公路上做匀加速直线运动，途中在6s内分别经过P、Q两根电线杆，已知P、Q电线杆相距60 m，车经过电线杆Q时的速度是15 m/s，则下列结论中错误的是[ ]

A．经过P杆的速度是5 m/s

B．车的加速度是1.5m/s²

C．P、O间的距离是7.5 m

D．车从出发到Q所用的时间是9s

连词成句。

1. trips, I, to, love, on, go (.)

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2. Nanjing, we, to, want, go, to (.)

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3. city, a, and, big, famous, Beijing, is (.)

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4. very, old, Palace, the, Museum, is, beautiful, and (.)

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