Unit 4

1. Unit 4 Learning about language

2. Answer key for Exercise 1 trend fuel

3. state consume glance

4. Answer key for Exercise 2 • 1.data; kept on • 2.quantities; run out • 3. build up; catastrope • 4. come about • 5. consequence • 6. phenomenon • 7.graph • 8.per • 9.even if • 10.resulted in

5. 强 调 句 型

6. 强调句型的结构 • 一、It is/was+ 被强调部分 + that+剩余的部分 （被强调部分是人： who/whom/ that ） • 注意 : • 1.被强调部分是:主语，宾语，表语或状语 • 2.强调句的连接词一般只用 that ； 强调人时，可用who (主语) 或 whom (宾语).

7. 3.强调句的时态一般为“It was/is+…+that” • 4.强调句的一般疑问句句型：Is / Was +it +所强调的部分+that / who/ whom…? • 5.强调句的一般疑问句句型：疑问词 +所强调的部分+that / who/ whom…?

8. Examples It wasin the streetthat I met her father. • 1. 我是在街上遇见她的父亲的。(强调地点) • 2. 你是8点开始工作的吗？（强调时间） • 3. 正是因为她病了，他们才没见她做这项工作。（强调原因） • 4. 他为什么不能回答这个问题？（强调原因，特殊疑问句） Was itat eight o’clockthat you began to work? It was because she was ill that they didn’t ask her to do the job. Why was it that he couldn’t answer the question.

9. 判断是否是强调句，可把 It is / was …that 去掉，剩余部分在不增减任何词的情况下还是一个完整的句子，那么这种句子是强调句。 • It wasin the streetthat I met her father. • →In the street I met her father. • It wasbecause she was illthat they didn’t ask her to do the job. • →Because she was ill, they didn’t ask her to do the job.

10. 二、 not ... until ... 的强调形式: It is not until + 被强调部分+ that ... “直到…才…”， • 主要用于强调时间状语的强调句型。 • I didn't realize she was a famous film star until she took off her dark glasses. • →Not until she took off her dark glassesdid I realize she was a famous film star. • →It was not until she took off her dark glassesthat I realized she was a famous film star.

11. Answer key for Exercise 2 • I t is scientists who warned that greenhouse gases would warm the earth by trapping heat energy in the atmosphere. • It is the greenhouse effect that gives the earth’s surface the average temperature of 15°c. 3It is fossil feul that much of the energy used to light and heat our homes comes from. 4. It is the developed countyies that consume the most energy in the world. 5. It is for centuries that carbon dioxide has the tendency to stay in the atmosphere while other greenhouse gases stay in the atmosphere only for a day or less.

12. 6. It is their very existence that low-lying countries feel is in danger from rising sea levels. 7. It is environmentalists who have tried to stop the earth’s temperature rising. 8. It is furture climate changes and their effects on our environment that scientists want to find out about. 9. It is by several meters that the level of the sea could rise in the years ahead because of the globlal warming. 10. It is outer sources that might provide us with new energy sources in the future.

13. 巩固练习： 1.It was ___ he said ____disappointed me. A. what ; that B. that; that C. what; what D. that; what 2. Is it in the factory _____ this type of cars are produced? A. which B. where C. that D. / 3. Is it the factory______ this type of cars are produced ? A. which B. where C. that D. /

14. 4. _____ on Monday night that all this happened? A. Is it B. It is C. Was it D. It was 5. It was _____ the old worker came that we _____ the experiment. A. until; didn’t begin B. not until; began C. until began D. not until; didn’t begin 6. It is I ____ singing in the garden. A. who are B. who is C. that am D. that is

15. 7. ---Why didn’t you answer when I spoke to you in the street this morning? ---I ___ but you didn’t hear me. A. did answer B. didn’t want to answer C. couldn’t answer D. was too busy 8. It is in the west of China _____ there is no doubt _____it is going to rain tomorrow. A. where; whether B. that; that C. that; whether D. where; that 9. It was 1969___ the American astronauts succeeded in landing on the moon. A. that B. when C. on which D. which

16. 10. It was the training _____ he had as a young man ____made him such a famous writer. A. when; that B. that; when C. that; who D. that; that

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

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

19. 5. It was ______ back home after the experiment. • 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. • A. because B. which C. since D. that

20. 7.It was in New Zealand____ Elizabeth first met Mr.Smith. A. that B.how C.which D. when 8. I don’t mind her criticizing me, but ___ is how she does it that I object to. • it B.that C. this D.which

21. 9.It is not who is right but what is right ____ is of importance. • which B. it C.that D. this 10. It ___ we had stayed together for a couple of weeks ___ I found we had a lot in common. • was until;when B.was until;that C. wasn’t until; when D.wasn’t until; that