Unit7 Section A 1a-1c 课件2022-2023学年人教版八年级英语下册

Unit 7 What’s the highest mountain in the world? Section A 1a-1c 1 Lead in 1,Which is the highest mountain in the world? 2.Which is the longest river in the world? 3.Which is the longest river in Asia? Qomolangma the Nile the Changjiang River Qomolangma Qomolangma runs along the border between China and Nepal. It is covered with snow all the year round. It’s 8844.43 meters high, the highest in the world. Which is the highest mountain in the world? the Sahara The Sahara is the biggest desert in the world. It is located in the northern Africa. Its climate conditions are very bad and is one of the earth's most unsuitable for biological survival. Which is the biggest desert in the world? the Nile The Nile is the longest river in the world. It’s more than 6,671 kilometers long. It runs through 9 countries. It runs into the Mediterranean Sea (地中海) in the end. Which is the longest river in the world? the Caspian Sea The Caspian Sea (里海) is the biggest inland lake in the world. It lies in the border between Asia and Europe. Which is the biggest inland lake in the world? Objectives 1.To learn new words: square, meter, deep, desert, 2.To learn to talk about geography and nature (了解地理自然) 3.To learn to read large numbers（大数字） 4. To learn to compare facts（学会比较） Self-learning 1.Self-learn the new words on page 49 2. Have a check. square meter deep desert n. 平方；正方形 n. 米；公尺 adj. 深的；纵深的 n. 沙漠 1. 复习1—100以内的所有数字。 2. 掌握百、千、万、十万、百万的表达法。 1、1-19的基数词 one 1 two 2 three 3 four 4 five 5 six 6 seven 7 eight 8 nine 9 ten 10 Exploration 2)三位数以上的数，从个位往前数，每三位数加一个逗号，从后往前数的第一个逗号代表thousand, 第二个逗号代表million, 第三个逗号是billion，注意这几个词不能用复数形式，后也不能加and。例如： 2,648 two thousand, six hundred and forty-eight 16,250,064 sixteen million, two hundred and fifty thousand, sixty-four 220 hundred 百 thousand 千 milli