Unit 4 Global warming Learning about language 高二人教新课标版选修六

Discovering useful words and expressions 1. Find the words in the text that have these two meanings. Take notice of the meaning used in the reading passage, write the words and mark their usage in the chart.

Possible meaningsWordWhich used 1.n. a general tendency in the way a situation is changing 2.v. to start doing something that everyone copies trend 1

Possible meaningsWordWhich used 1.v. to make something (especially something bad) increase 2.n. a substance that can be burned to make heat or energy fuel2

Possible meaningsWordWhich used 1.n. the physical or mental condition of someone 2.v. to formally say or write some information or an opinion 1.v. to use time, energy, goods, etc 2.n. (formal) to eat or drink something state 2 consume 1

Possible meaningsWordWhich used 1.v. to look quickly at someone or something 2.v. to read something very quickly glance2

2. Go over the new words and phrases in the previous sections. Then complete each sentence with one of those new words or phrases.

1. Charles Keeling collected ______on the carbon dioxide content in the atmosphere over a forty-year period. He found that the amount of carbon dioxide _______ increasing during that time. data kept on

2. Although we are burning coal in huge _________ every year, we won't ________ of it for centuries. 3. If the amount of greenhouse gases continues to _______, we could be facing a global __________. quantities run out build up catastrophe

4. Many scientists believe that global warming has __________ through the burning of fossil fuels. come about 5. The _____________ of a rising sea level would be widespread flooding. consequence

6. On the whole the warming of the earth is a ____________ that causes great concern. 7. The __________ shows temperature changes during the 20th century. 8. One hectare of forest can absorb 23 tons of carbon dioxide ____ year. phenomenon graph per

9. The washing machine uses too much energy, but _________ we buy a more economical one, it would still use too much water. 10. The car accident on the main road yesterday ___________ one driver’s death. even if resulted in

Grammar The use of “it”

一、 it 表示强调, 其结构是 : It is/was+ 强 调部分 + that+ 原句剩余部分。此结构 只限于强调状语、主语和宾语。 注意： ①如果强调的是人, 其后用 that 或 who 均可 ; ②如果强调的是物、时间或地点等状 语, 其后只能用 that 不用 where 、 when 、 why 。

Tom lost a book on the park yesterday morning. 1. 强调主语 It was Tom that lost a book on the park yesterday morning. It was Tom who lost a book on the park yesterday morning. 2. 强调宾语 It was a book that Tom lost on the park yesterday morning.

3. 强调地点状语 It was on the park that Tom lost a book yesterday morning. 4. 强调时间状语 It was yesterday morning that Tom lost a book on the park.

Because she was ill, they didn’t ask her to do the job. It was because she was ill that they didn’t ask her to do the job. 强调原因状语从句

1. 强调句中的 be 只有 is 和 was 两种； 2. 强调句的一般疑问句句型： Is / Was +it + 所强调的部分 +that / who/ whom + 其余部分 ? 3. 强调句的特殊疑问句句型： 疑问词 + 所强调的部分 +that / who + 其余部分 ? 注意：

Was it Tom that /who I saw yesterday here ？ Was it at eight o’clock that you began to work? Where was it that you picked up the wallet? Why was it that he couldn’t answer the question ？

判断是否是强调句，可把 It is / was …that 去掉，剩余部分如果是一个完整 的句子，就是强调句。 It was in the street that I met her father. →In the street I met her father. It was because she was ill that they didn’t ask her to do the job. →Because she was ill, they didn’t ask her to do the job.

1. It was in 1945 that World War II ended. ( 强调句 ) 2. It was 1945 when World War II ended. ( 定语从句 ) 3. It was a long time since I met you last. ( 时间状语 )

二、若原句是 not…until 句型, 在强调 until 部分时, 要把否定形式放入被强调 部分。例如 : He didn’t leave until l returned. = It was not until I returned that he left ．

I didn't realize she was a famous film star until she took off her dark glasses. → Not until she took off her dark glasses did I realize she was a famous film star. → It was not until she took off her dark glasses that I realized she was a famous film star.

1. It was about 600 years ago ____ the first clock with a face and an hour hand was made. (NMET 1997) A. that B. until C. before D. when 2. It was only when I reread his poems recently ___ I began to appreciate their beauty. (NMET 1998) A. until B. that C. then D. so A B 高考链接

3. It is these poisonous products ___ can cause the symptoms of the flu, such as headache and aching muscles. (NMET 2003 上海 ) A. who B. that C. how D. what 4. Why! I have nothing to confess. _____ you want me to say? (NMET 2004 上海 ) A. What is it that B. What it is that C. How is it that D. How it is that B A

5. It was ___ back home after the experiment. (NMET 2004 湖北 ) A. not until midnight did he go B. until midnight that he didn’t go C. not until midnight that he went D. until midnight when he didn’t go 6. It was with great joy ___ he received the news that his lost daughter had been found. (NMET 2004 福建 ) A. because B. which C. since D. that C D

Homework Review the grammar and then finish the exercises on P29.