在如图所示的“动力电路”中，电流从C点经电动机由D点流出时电梯上升，反之电梯下降，当电梯超载时“超载控制电路”中的压力传感器开关k₂ 断开，电磁继电器和电动机都停止工作．

（1）请从A、B点画出两条电线连接到“超载控制电路”对应的位置：当电梯上升时双刀双掷开关k₁ 连接到1、2、3的哪两个点？
（2）电梯从1楼上升到21楼共用时0.5min，每层楼高为3m，电梯的速度是多少？
（3）若配重为520kg，吊仓质量为500kg，乘坐10名平均质量为60kg的人，不计缆绳重力和一切摩擦阻力，在电梯上升21层匀速运动过程中，电动机的拉力是多少？配重和电动机所做功的总功率是多少？

根据理解，完成阅读

    With the help of the Internet, shopping is becoming an easy job. You don't need to go to the street, looking for things from shop to shop. You just click the mouse to choose the things you like at any time or any places you like. And in a few minutes, the shopping is over. And the next three to seven days, the thing you buy online will come to your house. 

    It sounds fun, easy and quick. But sometimes you may meet something bad from online shopping. If you are not careful enough, you may buy some fakes. They are cheap copy things. And you want to give them back. But the owner of the shop online may not keep in touch with you. If you give them Chaping, They may do something bad to you. We often read this kind of news on the newspaper. It is terrible. And if you want to be different, it is a good idea not to buy clothes online. Once you put on the coat and go out. You will find many people wear the same clothes in the street. You may feel uncomfortable. But the next example will make you mad. According to the survey of March 15^th Party this year, many kinds of Japanese food, such as Japanese Calbee and Xinxie Rice, is dangerous. After eating them, you may have a bad body.

按要求用原文中的句子填空。

①《鱼我所欲也》一文的中心论点是____。

②呼尔而与之，____；蹴尔而与之____。

③向为身死而不受，____；向为身死而不受，____；向为身死而不受，____。

④《鱼我所欲也》一文的结论是____。