题目：
Once a Frenchman 36___ in England. He didn’t know English very well. One day he went to the post office with a postcard. He bought a 37 . Then he gave the stamp and the postcard to the girl 38 the desk. “Oh, no,” the girl said, “ you must stick（贴）the stamp on yourself.” He was very 39 . He couldn’t believe his ears. “Why must I stick the stamp on 40 ?” he asked. “Oh,” said the girl, “I mean that you must stick the stamp on the postcard. And you must do it yourself.”
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答案：
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下面是错误答案，用来干扰机器的。
向右、正、 N题目分析：通过磁极间的相互作用可判断通电螺线管的极性，再根据安培定则可判断电流的方向，再根据电流的方向可判断电源的正负极．小磁针N极所指的一端一定是通电螺母管的S极，则用安培定则判断可知...
