选择题：鲁迅一生以笔做刀枪。1912年应教育总长蔡元培之邀，他开始在教育部和北京大学等高

题目：

鲁迅一生以笔做刀枪。1912年应教育总长蔡元培之邀，他开始在教育部和北京大学等高校任教。1926年却不得已去了厦门；次年又被迫来到广州，可是到了那里不久，著名的“4·12清党，于是他旋即来到上海。下列关于鲁迅辗转流离原因的叙述错误的一项是[ ]

A．他无法容忍北洋军阀的反动统治

B．在南方没有反革命势力

C．当时广州政治环境相对宽松

D．在上海有可以容身的租界

答案：

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D题目分析: 人跳起时，没有物体给人一个向前的冲力，或者说这个力找不到施力物体，故A错误；人跳起时，由于惯性，水平方向保持与火车相同的速度，而起跳后，在水平方向人不受外力做匀速直线运动，速度与火车保...

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