概要：The new car factory will produce an average 200,000 cars each year .The average age of the girls in our class is 22 .4. play a part in 在……起作用。play an important part in 在……起重要作用。Women are playing an important part in our socialst construction . 妇女在社会主义建设中正发挥着重要作用。Electricity plays an important part / role in our daily life .The part that women have played is great .We must make the young play their parts to the full .5. a cause of death 死亡原因6. in danger 处于危险境地You are in danger
高二英语第九单元 Saving the Earth (拯救地球),标签：高二英语选修7教案,高二英语下册教案,http://www.67jx.comThe new car factory will produce an average 200,000 cars each year .
The average age of the girls in our class is 22 .
4. play a part in 在……起作用。play an important part in 在……起重要作用。
Women are playing an important part in our socialst construction . 妇女在社会主义建设中正发挥着重要作用。
Electricity plays an important part / role in our daily life .
The part that women have played is great .
We must make the young play their parts to the full .
5. a cause of death 死亡原因
6. in danger 处于危险境地
You are in danger of being killed .
We are worried about the country , which is in danger of war .
The workers in danger must be rescued without delay . 必须立即挽救那些处于危险中的工人们。
注意：out of danger 脱离危险，摆脱危险。be dangerous 危险的。
7. three types of tiger living in China 生存在中国的三种老虎
8. a total of 总额，总量，总数有
A total of 160 people died in the earthquake .
This company has a total of 30 workers .
9. go on an organized trip to + 地点“去……团体旅行”
10. fill in 填写
Please fill in the blanks here with your name and address .
His discovery filled in the gaps in the fields of science and technology .
11. be interested to do 干……很感兴趣
12. be busy (in) doing 忙于干……
We are busy going over our lessons .
13. take photographs / photos / pictures + of 拍摄……的照片
14. to one\'s joy 使某人高兴的是。to one\'s great joy = to the great joy of sb = much to one\'s great joy
To the great joy of my friends , I have won the first .
15. in good condition 完好无损，健康良好，保养得好
He has been in good condition .
How can we keep the water in good condition in our village ?
注意：out of condition 身体不适
I can\'t go swimming today . I\'m out of condition .
二、学海导航
【学法指要】
单元易错用的熟词释疑
● POPULATION 能用复数吗？
在 Lesson 34 课文第一段中有这样一句：Many parts of the world , which once had large populations and produced plenty of crops , have become deserts . 这里的 population 为什么使用复数？
【释疑】
◆ population 多用单数，指某国家或地区的人口。如果用复数，指世界不同地区的人口。例如：
Many parts of the world , which once had large populations and produced plenty of crops , have become deserts . 世界上许多地区曾经人口众多，五谷丰登，而今却成了沙漠。
According to the latest census , China\'s population has increased . 根据最近的调查，中国的人口增加了。
◆ population 直接作主语时，谓语动词一般用单数形式指住在某地区的全体居民，为不可数名词，但前面有 some , most 特别是分数或者百分数时，谓语动词常用复数。例如：
The population in these villages has to get its water from wells . 住在这个村子里的人必须自井中汲水。
The population of the city rose by 20% . 这个城市的人口增长了 20 % 。
Most of the population in this city are workers . 这个城市大多数人是工人。
At present about 38% of the Chinese population smoke . 目前中国大约有 38% 的人吸烟，
In India , however , the population of tigers has increased , from 2,000 in 1972 to about 5,000 in 1989 .
然而，在印度，老虎的数量增加了 ， 1972 年只有2，000 只，1989年增加到了大约5，000 只。
In the south most of the population live on rice . 在南方，绝大多数人以大米为食。
◆ 问“人口多少”用 ：what 或者 how large 。不用 how many 和 how much 等词。说人口多用 large或者 great , 说人口少用small 。例如：
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