初中“正数和负数”(第一节课)设定的教学目标如下：
①通过丰富实例，进一步体会负数的意义；
②理解相反意义的量，体会数的扩充过程；
③用负数表示现实情境中的量，体会数学应用的广泛性。
完成下列任务：
根据教学目标③，设计两个问题，让学生用负数表达，并说明设计意图；
参考答案：问题①：向东走2米记作+2米，向西走2米记作多少
问题②：某种商品价格上涨10%和下降15%，分别怎么表示
(设计意图：通过师生活动，使学生正确理解具有相反意义的量，并能用数学符号表示负数。)
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| The difference between life in one country and that in another is quite often __1__ the difference between city life and village life in __2__ country. In an English village everybody __3__ everybody else; they know what time you get up, what time you go to bed and what you usually have __4__ dinner. If you want any help, you will always get it and be glad to help anyone else in return. In a large city __5__ London, there are many things and places for people to see and to go to. But people Often don't know each other __6__. It sometimes happens that you have __7__ seen your next-door neighbour, or don't know his name or anything about him. People living in London are often very __8__, especially (特别是) __9__. Many of them usually spend evenings, weekends and holidays in the country. If you walk through a street in London on a Sunday, it is almost like __10__ town. | ||||
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