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【多选题】
关于坐标系,下列说法正确的是( ) A .建立坐标系是为了定量描写物体的位置和位置变化 B .坐标系都是建立在参考系上的 C .坐标系的建立与参考系无关 D .物体在平面内做曲线运动,需要用平面直角坐标系才能确定其位置A.
？
B.
？？
C.
？？？
D.
？？？？
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【单选题】Which sentence is right?
A.
Although she knew that it was dangerous, but she walked home by herself.
B.
My knee started hurting, I stopped running.
C.
Since we've got a few minutes to wait for the train, let's have a cup of coffee.
D.
She bought the whole lot-house and farm and horses and all.
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【简答题】He was driving home one cold evening on a country road when he saw an old lady，stranded on the side of the road.He stopped to give her a ____.“Why don’t you wait in the car where it is warm，Madam？It w...
【简答题】One day a man saw an old lady standing by her expensive car, clearly in need of help. So he stopped his old truck and got out. Although he was smiling, the old lady was worried. Was he gong to hurt he...
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