Unit 3, Lesson 1: World Population Growth

1. Vocabulary: pronunciation and meaning

2. Comprehension questions
(1) In which year did world population reach five billion people?
(2) Does the Earth have enough natural resources to support the whole world population?
(3) What natural resources are limited?
(4) What problem do we have with water?
(5) What problems do we have with land?
(6) What problem do we have with air?
(7) What problem do we have with nonrenewable energy?

3. usage
(1) by (line 5) vs. by (line 10) (解釋)
(2) while (line 37) vs. while (line 55) (解釋)
(3) As the standard of living goes up in other countries, so will the demand for energy. (line 60) (解釋)

4. grammar
(1) By 196, just thirty years later, the world's population had hit three billion. (line 5)
(2) Most of it comes from burning fossil fuels ... (line 49) (subject-verb agreement)
(3) Three quarters of this commercial energy is used ... (line 59)


5. prepositions: Please find collocations in which prepositions occur. For example, the answer to this question ... (line 15)

• By 1960, ... (line 5-6)
• ... by seven-six million people (line 10)
• Unfortunately, the answer to this question ... (line 15-16)
• ... depends on information ... (line 16)
• the removal of salt from salt water (Line 31) / ... remove the salt from ocean water (line 33)
• ... a solution to the shortage of fresh water. (line 32)
• In addition, over-cultivation has already ... (line 40)
• an amount of farmland equal to the size of the United States and Canada combined (line 41)
• an amount of farmland equal to the size of the United States and Canada combined (line 41)
• What effect would three billion more people have on the air ... (line 53)
  

6. Quizlet

7. assignments:
(1) Find sentences in which some collocations are used.

• answer to
• 
  

(2) Do exercises A, B, C, D, F, G

8. quiz: the first two lessons, right after the second lesson is completed.