英语人教版八年级下册unit7 A第一课时.pptVIP

Unit 7What’s the highest mountain in the world? Section A (1a-2c) Numbers and Expressions Can you read them? 8 25 185 3605 What about it? 3141592654 100 1,000 10,000 100,000 1,000,000 10,000,000 100,000,000 1,000,000,000 10,000,000,000 100,000,000,000 thousand(千) million（百万） billion（十亿） Tip（提示）：With commas, they’re easy to read. Read and learn 1000以上的基数词的表示法。先从右到左数，每三位数加一个逗点。第一个逗点前的数为thousand(千)，第二个逗点前的数为million(百万)，第三个逗点前的数为billion(十亿)。 two hundred and twenty-two 2222222222 Let’s try！ 2，222，222，222 two billion two hundred and twenty-two million two hundred and twenty-two thousand 1,025 6,671 9,600,000 8,844.43 1,025 : 6,671 : 9,600,000: 8,844.43: one thousand and twenty-five six thousand six hundred and seventy-one nine million six hundred thousand eight thousand eight hundred and forty-four point four three Have a try！ 1,025 6,671 9,600,000 8,844.43 Top of the world mountain 8844.43 meters high desert About 9,600,000 km2 in size （square kilometers） salt lake 1,025 meters deep river 6,671 kilometers long 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. higher the biggest the deepest the longest 咸水湖 其它的任何山脉 1b.listen and complete the sentences 二、对于物体长、宽、高、深度 、面积等的表达 一、 形容词和副词的最高级 适用范围： 构成： 形容词/副词比较级和 最高级的变化规则： eg：---How deep is it? ---It’s 1,025 meters deep. 三者或三者以上 主+be/实动 +the +形/副最高级+名词+in/of 短语 ?一般情况 ?以不发音e结尾的单音节词 ?在重读闭音节 ?以“辅音字母＋y”结尾的双音节词 ?其他双音节词和多音节词 ?少数不规则 key words： river, long ， about 6,300 kilometers The Yangtze River is in China. It is about . the longest river about 6,300 kilometers long key words： large , salt lake ,75 meters deep Qinghai Lake is salt lake in China. It is