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1、Unit 4 Population Problems1st period本單元目標(biāo)本單元目標(biāo)Now discuss these questions and answer themTHE ANSWERS ARE1.It shows the population growth.2.Yes, it is.3.Its 6.4 billion.4.They are faced with the problem of overcrowding, population growth, aging population.5.It should control the birthrate.The answers

2、 are2.5billion6billion6.4agingbirthratelivelongerpopulationgrowthlargechildrendoublingpopulationgrowthovercrowdingAnswer the questionsTHE ANSWERS ARE 1.Before 1990. 2.Before 2005. 3.Collecting enough information. 4.The past perfect tense.DO SOME EXERCISES 1He asked me _ during the summer holidays.A.

3、 where I had been B. where I had gone C. where had I been D. where had I gone 2. What _ Jane _ by the time he was sever?A. did, do B. has, done C did, did. D. had, done3. I _ 900 English words by the time I was ten。A. learned B. was learning C. had learned D. learnt4. She _ lived here for _ years.A.

4、 had, a few B. has, several C. had, a lot of D. has, a great deal of5. By the time my parents reached home yesterday, I _ the dinner already.A had cooked B. cooked C. have cooked D. was cooked6. She said she _ the principle alreadyA .has seen B. saw C. will see D. had seen7. She said her family _ th

5、emselves _ the army during the war.A. has hidden, from B. had hidden, from C. has hidden, with D. had hidden, with8. By the time he was ten years old, he _.A. has completed university B. has completed the universityB. had completed an university D. had completed university9. She had written a number

6、 of books _ the end of last year.A. for B. in C. by D. at 10. He _ to play _ before he was 11 years old.A had learned, piano B. had learned, the piano C. has learned, the piano D. learns ,piano.THE ANSWERS ARE 1. A. where I had been 2. D. had, done3. C. had learned 4. B. has, several 5. A. had cooked 6. D. had seen7. B. had hidden, from 8. D. had completed university9. C. by 10.B. had learned, the piano