(3，1)→____→____→____→(1，3)

如图是自制简易电动机模型．现在主要讨论该简易电动机的制作与操作问题，步骤如下：

（1）绕制线圈的铜丝外表有漆皮，必须对线圈引出线的两端（搁置于铜质弯钩的部位）进行刮漆处理，刮漆方法见放大图．问：进行刮漆处理，目的是使引出线能够____ ．

（2）如果整个制作没有问题，但接上电源后线圈不动，这时应做何尝试？（写出一点即可）____ 

（3）通电后线圈能转动，如要改变转动方向，可采取的做法是：____ （写出一点即可）

******在第二届世界互联网大会开幕式演讲中指出，乌镇的网络化、智慧化，是传统和现代、人文和科技融合发展的生动写照，是中国互联网创新发展的一个缩影。这表明（    ）

①乌镇创造了用互联网改变事物固有联系的奇迹

②乌镇建立了有“人化”特点的人为事物的联系

③透过乌镇可以了解中国互联网发展的一般状况

④透过乌镇可以了解中国各地互联网发展的特色

    Expert(专家)say that students usually need eight to ten hours' sleep at night, but most Chinese students do not get enough sleep. Some Chinese parents are usually glad to see their children studying late. They will think their children work very hard, but not all parents are happy about this. Once a mother told us that every morning her 10-year-old boy put up one finger(手指)with his eyes still closed, begging(请求)for one more minute to sleep. Like thousands of students "early birds" in China, he has to get up before six every morning.

    A report shows that without a good night's sleep, students seem to be weaker(虚弱)than they should be. Many students have fallen asleep(睡觉) during class at one time or another. Too much homework is not the only reason why students stay up late. Some watch TV or play the computer games late into the night.

    Experts have ever said that the students should develop good study habits. So some clever students never study late, they are able to work well in class.