内容正文：
Module 9 Population
Unit 1 The world’s population was about 7.8 billion in 2020.
外研八年级（上）
Learning Objectives
1. understand conversations about population;
2. use large number to talk about population issues；
3. arouse the awareness of concern with population issues.
By the end of the class, we will be able to:
Work in pairs. Look at the picture and talk about it.
Use the words in the box to help you.
city shop noise people traffic
There are many people in the city.
The city is very crowded.
There is much noise.
The traffic may be heavy.
What caused the above problems?
What information can you get from this video?
The population of the world increase quickly; the population of China is the largest of all;...
From the video we know that the world’s population is 7.7 billion by 2019 and China has a population of 1.4 billion. So, do you know how to read big numbers?
大数字念法：
每三个数字为一个单位，每个单位的数字按照百、十、个位向后读，遵循百位以内数字的读法。进位读法为thousand, million, billion向上递增。
Try to read these numbers.
100:
1000:
1000000:
1000000000:
130:
1250:
150,000:
500,000:
2,100,000:
5,600,000:
82,550,000:
3,5600,271,849:
one hundred
one thousand
one million
one billion
one hundred and thirty
one thousand, two hundred and fifty
one hundred and fifty thousand
five hundred thousand
two million, one hundred thousand
five million, six hundred thousand
eighty-two million, five hundred and fifty thousand
?
3，5600，271，849
thousand
million
billion
hundred
eight hundred and forty-nine
three billion,
five thousand and six hundred million,
two hundred and seventy-one thousand,
大数字的表达方法
Listen and repeat.
8,742
2,463,128
1,370,000,000
2,000,030,000
eight thousand, seven hundred and forty-two
two million, four hundred and sixty-three thousand, one hundred and twenty-eight
one billion, three hundred and seventy million
two billion and thirty thousand
Listen and choose the correct answer.
1 What is the population of New York?
a)About 17 million.
b)About 9 million.
c)Abou