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1、Warming-upWarming-up high-higher-highesttall-taller-tallestWhos the tallest student in our class?Unit 7 Unit 7 Unit 7 Unit 7 Whats Whats Whats Whats the highest the highest the highest the highest mountain in the wormountain in the wormountain in the wormountain in the worl l l ld d d d?Muyi Middle
2、SchoolMuyi Middle SchoolMuyi Middle SchoolMuyi Middle SchoolQu XiaoqinQu XiaoqinQu XiaoqinQu XiaoqinStudy aimsStudy aimsStudy aimsStudy aims1.较大数字的读法2.掌握和运用形容词的比较级和最高级谈论各之最square n.平方；正方形平方；正方形meter n.米；公尺米；公尺desert n.沙漠沙漠deep adj.深的；纵深的深的；纵深的8,844.438,844.43What do you know about this number?Lets e
3、njoyenjoyenjoyenjoy the beauty of nature!Qomolangma The worlds highest mountain in the world.Do you know how high it is?Its 8844.43 8844.43 8844.43 8844.43 meters highmeters highmeters highmeters high.The Nile is the longest river in the world.Its more than 6,6006,6006,6006,600 kilometers kilometers
4、 kilometers kilometers longlonglonglong.The NileThe Caspian SeaThe worlds deepest salt lakeDo you know that how deep the worlds deepest salt lake?Yes,it is 1,025 meters deep1,025 meters deep.The Sahara is the biggest desert in the world.Its about 9,600,0009,600,0009,600,0009,600,000 square square sq
5、uare square kilometers in sizekilometers in sizekilometers in sizekilometers in size.The SaharaHere are some numbers can you read it?Here are some numbers can you read it?9,600,000Nine million six hundred thousand1,025One thousand and twenty-five6,671Six thousand six hundred and seventy-one8,844Eigh
6、t thousand eight hundred and forty-four 大数字的表达法：1000以上的基数词表达法从数字的右端往左数，每三位数加一个逗号（即以此把数字分为若干段）。第一个逗号前的数为thousand(千)，第二个逗号前的数为million(百万)，第三个逗号前的数为billion(十亿)1a.Match the facts you know.Qomolangma about 9,600,000 square kilometers in sizeThe Sahara1,025 meters deepThe Caspian Sea6,671 kilometers longT
7、he Nile8,844.43 meters highListen and complete the sentences.1b 1.Qomolangma is _ than any other mountain in the world.2.The Sahara is _ desert in the world.3.The Caspian Sea is _ of all the salt lakes.4.The Nile is _ river in the world.higherthe biggestthe deepestthe longest The longest riverlonges
8、t riverlongest riverlongest river in the world is the the the the Nile.Nile.Nile.Nile.Which is the longest riverlongest riverlongest riverlongest river in the world?Practice in pairs like this:A:Which is the(deepest/highest/biggest/longest)in the?B:Lets protectprotectprotectprotect the beauty of nature!1.big numbers2.数词+单位名词的复数+形容词eg.1,025 meters deep 6,671 kilometers long3.A+be+形容词的比较级+than+B eg.Mary is taller than Linda.the+形容词的最高级+名词HomeworkHomework1.To make dialogues about asking the size of objects.(1a)2.Write down three sentences using the comparisons on your exercise book.