英语八年级下册（2024）Unit 4 The Wonders of NatureSection A教学课件ppt

这是一份英语八年级下册（2024）Unit 4 The Wonders of NatureSection A教学课件ppt，共25页。PPT课件主要包含了Objectives，Lead-in，a ，拓展知识，b ，不规则变化，比较级的用法，c ，d ，desert等内容，欢迎下载使用。
T knw the rivers in the wrld.T learn abut the Yangtze River, the Yellw River and the Nile.T knw hw and why peple cnnect with rivers.
D yu knw the lngest river in China?
It the Yangtze River.
What’s the lngest river in the wrld?
It’s the Nile.
Read the cnversatin and underline the three rivers mentined.
Yaming: Welcme back, Ella! Hw was yur trip?Ella: It was great! We saw the Huku Waterfall n the Yellw River. Is that the lngest river in China?Yaming: N, the Yangtze River is the lngest river in China. It travels the farthest and is abut 6,300 kilmetres lng. The Yellw River is 5,464 kilmetres lng and is the secnd lngest. By the way, d yu knw why it's called the Yellw River?
Ella: Because it’s yellw?Yaming: Right. Sme parts f the river carry brwn and yellw earth. Ella: That’s interesting! I like learning abut rivers. My favurite is the Nile. Did yu knw it’s the lngest river in the wrld?Yaming: Yes, it’s 6,671 kilmetres lng. It’s very imprtant in Egypt’s histry. Ella: That’s right. Bth the Nile and the Yellw River helped ancient civilizatins t develp. And they’re still very imprtant tday.
Yaming: Yes. In China, we even call the Yellw River ur “mther river”! Ella: We shuld prtect them at all csts.
The Huku waterfall
壶口瀑布是黄河干流瀑布 。东濒山西省临汾市吉县壶口镇，西临陕西省延安市宜川县壶口镇，为两省共有旅游景区。南距陕西省西安市350千米；北距山西省太原市387千米。 壶口瀑布是中国第二大瀑布，世界上最大的黄色瀑布 。黄河奔流至此，两岸石壁峭立，河口收束狭如壶口，故名壶口瀑布。瀑布上游黄河水面宽300米，在不到500米长距离内，被压缩到20—30米的宽度。1000立方米/秒的河水，从20多米高的陡崖上倾注而泻，形成“千里黄河一壶收”的气概。
Yellw River
黄河，是位于中国北方地区的大河，属世界长河之一，中国第二长河（也有称第二大河流）。黄河之“黄”，实为泥沙。古籍有载：“黄河斗水，泥居其七”。黄河全长约5464千米 ，流域面积约79.47万平方千米（包括内流区4.20万平方千米）。黄河是中华文明最主要的发源地，中国人称其为中华民族的“母亲河”。每年都会携带十六亿吨泥沙，其中有十二亿吨流入大海，剩下四亿吨长年留在黄河下游，形成冲积平原，有利于种植。黄河流域是中国开发最早的地区。在世界各地大都还处在蒙昧状态的时候，我们勤劳勇敢的祖先就在这块广阔的土地上斩荆棘、辟草莱，劳动生息，创造了灿烂夺目的古代文化。
Yangtze River
长江，中国境内太平洋水系河流，发源于青海省西南部、青藏高原上的唐古拉山脉主峰各拉丹冬雪山，曲折东流，干流先后流经青海、四川、西藏、云南、重庆、湖北、湖南、江西、安徽、江苏、上海共11个省、自治区和直辖市，最后注入东海。是中国、亚洲第一大河，全球第三长河流。流域面积180万平方千米，约占全国总面积的1/5，年入海水量9513亿立方米，占全国河流总入海水量的1/3以上。截至2023年，长江流域内已建设了125座联合调度水工程，涵盖诸如长江三峡、葛洲坝等重要的水利项目。 长江干流素有中国“黄金水道”之称，通航里程达2800多千米。
What d Yaming and Ella knw abut these rivers? Read the cnversatin and cmplete the table.
civilizatins
形容词 / 副词比较级变化规则
high— higherlw — lwerdeep —deeper
一般情况下，在词尾加-er
large — largerfine — finer
以不发音字母e结尾的词，在词尾加-r
heavy — heaviereasy — easierearly — earlier
以“辅音字母 + y”结尾的双音节词，先把y改为 i ,再加-er
big — biggerfat — fatterthin — thinner
重读闭音节词词尾只有一个辅音字母时，先双写该辅音字母，再加-er
beautiful — mre beautifulinteresting — mre interestingdelicius — mre delicius
多音节词和部分双音节词在词前加mre
比较级(cmparatives)
1. 表示在两者进行比较时用比较级，结构为 “A + be/行为动词 + 比较级 + than + B.”。My paper plane flew farther than Jenny’s.2. 表示“哪一个更……”时，用“Which/ Wh is + 比较级, A r B?”句型。Which is nearer t the sun, Mars r the earth?
3. 表示“两者之间较……的一个”时，常用 “the + 比较级”结构。He is the taller f the tw.4. 表示“越来越……”时，用“比较级 + and + 比较级”，多音节词和部分双音节词用 “mre and mre + 原级”。It’s becming clder and clder.
5. 表示“越…… 就越……”时，用“the + 比较级, the + 比较级”结构。The mre careful yu are, the fewer mistakes yu will make.
Listen t the cnversatin. Then rle-play it.
Welcme back, Ella! Hw was yur trip?
It was great! We saw the Huku Waterfall n the Yellw River. Is that the lngest river in China?
N, the Yangtze River is the lngest river in China. It travels the farthest and is abut 6,300 kilmetres lng. The Yellw River is 5,464 kilmetres lng and is the secnd lngest. By the way, d yu knw why it's called the Yellw River?
Imagine that yu are Yaming r Ella. Cntinue the cnversatin with a parent abut ther gegraphical Features in China.
Ella: Culd yu tell me mre abut China, Yaming?Yaming: Sure! What wuld yu like t knw?Ella: What's the biggest desert in China? Yaming: It's the Taklimakan Desert.Ella: D yu
Ask and answer.
What is the lwest place in China?
It’s the Aydingkl Lake.
Language pints
helped the develpment f ancient _____ 帮助了古代_____的发展
develpmentn. 发展；壮大
develpv. 发展
develped adj. 发达的；高度发展的
固定搭配with the develpment f随着……的发展
What are yur plans fr the develpment f yur cmpany?你打算怎样来发展壮大自己的公司？
2. What’s the biggest desert in China? 中国最大的沙漠是什么？
v. 抛弃；遗弃；擅离（职守）
（1）Camels are called the “ships f the desert”. 骆驼被称为“沙漠之舟”。（2）Never desert yur friends in truble. 永远不要在朋友困难时抛弃他们。
写出下列单词的比较级。
1. gd _______ 2. cmfrtable ________________ 3. big _______ 4. happy ________ 5. cheap ________ 6. many _______ 7. difficult ______________ 8. little ______________
better mre cmfrtable bigger happier cheaper mre mre difficultless
用所给单词的正确形式填空。
I think paper bks wn’t disappear in the future with the ___________ (develp) f e- prducts.2. AI technlgy in China has develped _______ (fast) than anyne expected.