
通过对这个实际问题的探究,把学生的思维由用勾股定理求线段CD的长度转移为用曲线的方程来解决一方面帮助学生回顾了旧知——求轨迹方程的一般方法,另一方面,在得到汽车不能通过的结论的同时学生自己推导出了圆心在原点,半径为4的圆的标准方程,从而很自然的进入了本课的主题用实际问题创设问题情境,让学生感受到问题来源于实际,应用于实际,激发了学生的学习兴趣和学习欲望这样获取的知识,不但易于保持,而且易于迁移通过对问题一的探究,抓住了学生的注意力,把学生的思维引到用坐标法研究圆的方程上来,此时再把问题深入,进入第二环节(二)深入探究——获得新知问题二 1根据问题一的探究能不能得到圆心在原点,半径为的圆的方程2

2体重下降如果孩子在短时间之内体重发生了迅速的下降,那么身体内就很可能有了疾病,大家都知道蛔虫是一种艺术与人体营养的寄生虫,所以它存在于体内的时候就会吸取人体的营养物质,体重就会在短时间之内发生严重的下降而这个时候孩子的免疫力也会降低很多,更容易染上流行性疾病,所以如果孩子在一段时间内身体发生了,非常脆弱,或者是容易生病的现象,也一定要注意,很可能是体内有了蛔虫3拉出或者吐出蛔虫这种寄生虫一般都会在人体的肠道内生存,不过如果状况比较严重或者症状发生的比较紧急,也可能会全身蔓延,以至于发展到机体的胃部以及大肠,这个时候患者就会出现拉出蛔虫或者是吐出蛔虫的状况如果发现体内有蛔虫或者条状物的排出,家长一定要注意看一下是否是蛔虫,如果确定是寄生虫那么一定要及时就医

What should he doThis brainstorming stage is helpful in providing ideas for actualspeaking.By discussing with peers they can get a lot of informationconcerning the new topic they are going to learn.Step3 Pre-taskIn this step I introduce the topic and give the students clearinstructions on what they will have to do.So first I willprepare some vivid and beautiful pictures to present them the new words.The studentsassociate the meaning of the vocabulary and the form of it,and theyalso practice the speaking and the listening.I’ll get thestudents to do a problem|solving activity to help the students to recall somelanguage that may be useful for the task.I will make asummary to give a detailed explanation about the Grammar point—sentencestructure “should/could”.I usually try to cultivate the learner’s unconsciouscompetence,give the students more examples.In this way,I think theywill get a further understanding of the Grammar.Step4 Task-cycleTask 1—Pair work.I’ll ask the students to work with their partners to learn to giveadvice to different problems using the key words and the grammatical points.Task 2—Listeningpractice I designed the (1)Pre-listening activities (2) While-listening activities (3) Post-listeningactivities.Task 3—Group work.I’ll get the students act out the conversation in small groups.Step5 Post-taskIn this step,I prepared two activities.First is—Let’s think.Michael,coming fromUSA.He wants to practice his Putonghua,But he is very shy.So can yougive some advice to him

你将如何赞叹(“善哉,皎皎乎若明月”)4一起想象这样一幅画面:伯牙正在鼓琴,子期正在听琴,当伯牙鼓琴志在杨柳、志在春雨、志在云雾、志在炊烟……子期会怎样赞叹引导学生以排比句的形式说句子5这正是“伯牙所念,钟子期必得之”我心有所念,我的好朋友必得之而赞之,如此理解自己心意的朋友,这就叫──知音而不论伯牙志在高山、志在流水,还是志在明月、志在清风,凡伯牙所念,子期必得之,这就是真正的知音6感情诵读2──4句7而伯牙在楚国是著名的弹琴高手,他能通过乐曲表达自己丰富的情感当他一次次将自己的情感融入琴声中,弹奏出一首首美妙的乐曲时,你想,他渴望得到什么(可能是称赞)周围的人会怎么称赞呢(琴艺高超、琴艺炉火纯青)8
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