Surfing the Internet can help open students' eyes and get more knowledge. As a teacher, I encourage my students to use the Internet. In class those students who surf the Internet understand lessons better than the others. Besides, people can use the Internet to write letters or stories and send emails. Many students communicate with their friends online. You can also make friends by chatting on QQ. It's cheaper than calling somebody far away and it's much quicker. Nearly one third of young people surf the Internet for fun. They like to listen to music, watch films, and go to their favorite stars' websites. But can the Internet cause problems? Some of my students who used to study well at school are now failing exams. Because they spend a lot of time playing computer games.

图 (甲)是直流电动机模型，图 (乙)是自制简易电动机模型．现在主要讨论图(乙)简易电动机的制作与操作问题：

阅读漫画《杀熟经济》，根据漫画内容，合理想象，写一段描写性的文字；针对这种现象发表你的看法并阐述理由。

      近年来，微商依靠微信朋友圈蓬勃兴起，之后又因为微商销售的对象是微信朋友，很快又被冠以“杀熟经济”这个不怎么好听的名号。现在只要一打开这个微信朋友圈，进入眼帘的很多是各种商品推介，卖面膜的、卖牛肉干的、卖袜子的，可谓比比皆是。有人直言，朋友圈已成生意圈。这种现象也引发网民大量吐槽。