unit 4 topic 3 what do you know about mars 学案1（仁爱版九年级上）

学习目标与要求：1. 了解更多关于火星的知识。 2. 掌握在原级比较中表示事物之间倍数、分数和百分数等数量关系的句型。 模块一：温故知新学习内容复习含情态动词的被动语态及prefer的用法。( ) 1. The old _ by the government. A. should take good care of B. take good care of C. should be taken good care D. should be taken good care of( ) 2. -I believe that many secrets in space _ soon. -I agree. We are looking forward to the answer. A. are discovered B. were discovered C. can be discovered D. have discovered ( ) 3.Tom prefers _ to _. He is a quite boy. A. to watch TV, dance B. to watching TV, dance C. watching TV, dancing D. watching TV, dance模块二：自主学习 (独立进行） (Self-study & Self-exploration)学习内容摘 记Step 1 词汇学习-预习P97-98的新单词，抄写4遍，并将新单词在课文中标记。Step 2 短语学习-请同学们在课本上找出下列短语，英汉互译。（要求：短语在课本上划出） solar system 太阳系 be named after 以命名 go around 旋转 at a distance of 相隔 in the night sky 在夜空 two-fifths as strong as 五分之二倍的强度 search for搜索 whats worse 更糟糕的是 Step 3 课文学习理解课文P97-1a 的短文 Step 4 句型及词的用法学习-知识点归纳。4.1 (1) So a person who weighs 90 kilos on earth weighs only 36 kilos on Mars.所以，一个在地球上重90公斤的人在火星上只重36公斤。(2) What on earth are you doing? 你究竟在干什么？【解析】在(1)句中划线部分是_(宾语从句/定语从句)，对_进行修饰或限制。这里who作weighs的_不能省略。而且由于被修饰词a person是第三人称单数，所以这里用weighs, 即第三人称单数形式。【归纳】观察(1)(2)两句，on earth有两种意思：_，_，作的意思讲时，常放在特殊疑问代词之_(前/后)。4.2 I often miss the family, but the excitement of being on Mars is worth it! 虽然我经常想念家人，但是在火星上的兴奋是值得的。 The novel is well worth reading. 这部小说很值得一读。【归纳】中，“值得”_“很值得做”_。及时训练：4.2 ( ) The science fiction is worth _. Because it can make you interested in science. A. read B. reading C. to read D. read it4.3 (1) Its diameter is 53% as wide as that of the earth. （百分比）它的直径是地球直径的53%(2) The gravity on the surface of Mars is about two-fifths as strong as it is on the earth. （分数） 火星表面的引力大约是地球表面引力的五分之二。(3) The students in our school are twice as many as those in yours. (倍数) 我们学校里的学生是你们学校里的学生的两倍。(4) The weather in Beijing isnt as hot as that in Wuhan. 北京的天气不如武汉热【归纳总结】1、2、3句都是表示原级比较的句型，其一般结构为：A+谓语动词+_/_/_+as+_+ as + B.第4句的结构是as+_+ as,其中that指代上文的_,若是复数名词则用_代替。Step 5 尝试性练习单选( ) 1. The apples in this basket are bigger than _ in that basket. A. them B. those C. / D. that( ) 2. The famous painting was named_ Autumn. A. to B. as C. for D. after( ) 3. Uncle Wangs purse was found by a _ girl named Ann. A. 12-year-old B. 12-years-old C. 12 years old D. 12 year old( ) 4.Is Mars bigger than the earth？ -No. Its about_ the earth. A. as big as B. as small as C. the same big as D. a quarter as big as( ) 5. _ since the pet dog ran away from its owner. A. It is three days B. It has been three days C. C. Three days has passed D. A, B or C 小组内成员互查完成情况并给予等级评定： 模块三：教师精讲（认真听讲并记录要点）训练内容摘 记Step 1 讲解新课1. 以与宇宙相关的图片，引入文章2. 听文章，了解大意，后完成书本P97-1b的练习3. 细看文章，组内合作完成P98-1c 的问题。4. 完成听力练习练习P98-2 。Step 2 巩固整合 讲解讲学稿知识点4.3 含百分比、分数和倍数的比较级的问题模块四：当堂训练（预时20分钟） 姓名：_班级：九(_)一、单项选择。二、用所给词的适当形式填空。1. Zhaolin Middle School is _(name) after a hero.2. She has been working there since the _(begin) of last summer.3. They are busy _(search) for more information about space.4. It_(take) the moon about a month to go around the earth one circle.5. Look at the photo. The _(four) one from the right is my teacher.