Workbook Unit 7 Answers

UNIT 7

Exercise 1

2. The taste of our drinking water has been ruined due to additives, such as chlorine.

3. Mysterious new illnesses have been caused by agricultural pesticides.

4. Agricultural crops such as fruits and vegetables are being destroyed because of traffic pollution.

5. Extremely dangerous chemicals are being released by factories.

6. People’s health in many large cities has been damaged as a result of smog.

7. Bigger deserts and more droughts have been created because of reduced rainfall.

8. Forests and wildlife are being harmed through global warming.

Exercise 2

Verb                        Noun                               Verb                 Noun

contaminate             contamination                 educate             education

contribute                contribution                     pollute             pollution

create                       creation                          protect             protection

deplete                    depletion                         reduce             reduction

destroy                    destruction                      threaten            threat

B

Your own answers.

Exercise 3

2. One way to inform the public about factories that pollute the environment is through educational programs on TV.

3. The ozone layer has been destroyed more in the southern hemisphere than in the northern hemisphere.

4. Agricultural sprays are damaging the soil in many countries.

5. Poverty is an enormous problem in many large cities where whole families can only afford to live in one room.

Exercise 4

A

Your own answers

C

1. True

2. False. The plastic used in credit cards is made from PVC. While PVC is being produced, harmful chemicals are released which can cause cancer in humans.

3. False. It is made from a biodegradable plastic.

4. True.

5. False. Only a few banks and credit card companies offer PVC-free cards.

Exercise 5

A

1. e

2. f

3. d

4. b

5. a

6. c

B

1. Although overpopulation is a world problem, overall birth rates are beginning to slow as women choose to have fewer children, and at an older age.

2. In some major cities, the problem of overbuilding is a result of too many skyscrapers and too little land area inside the city limits.

3. There is an overuse of fossil fuels when we should be looking for other natural sources of energy like wind and solar power.

4. City officials are trying to stop development in areas with overburdened roads and schools.

5. The best way to prevent the overflowing of our landfills is to have better and more efficient recycling programs.

6. Another way to help reduce the overcrowding of our schools is to build more schools and hire more teachers.

Exercise 6

Possible Answers

1.     A: Did you know that a big housing developer wants to build apartments in Forest Hill Park? I think it’s terrible.

B: One thing to do is to complain to the Parks Department about it.

        A: That’s a good idea.

        B: Another thing to do is to organize a public meeting to protest the threat to public property.

       

2.     A: Personally, I’m worried about drug trafficking. It puts lots of children and young people at risk.

B: One way to help is to educate young people about its dangers.

3.     A: You know, there’s a lot of corruption in our city government.

        B: The best thing to do is to report it to the local newspaper.

        A: Yeah, the bad publicity might help to clean things up a bit.

4.    A: There are so many unemployed people in this city. I just don’t know what can be done about it.

        B: One thing to do is to create more government-funded jobs.

5.     A: What worries me most is the number of homeless people on the streets.

        B: One way to help is to create more public housing projects.

        A: I agree.

        B: Another thing to do is to donate money to charities that provide shelters and food.

Exercise 7

Possible Answers

2. These days, a lot of endangered animals are being killed by hunters and poachers. The best way to stop this practice is to have more police to arrest the poachers.

3. During the past few years, lots of trees have been destroyed by acid rain. One thing to do about it is to stop factories that pollute the air.

4. Underground water is being contaminated by agricultureal sprays. The best way to deal with the problem is to create safe agricultural sprays.

5. Too many young peole’s lives are being ruined through the use of illegal drugs. The best way to fight drug traffickers is to enforce the laws against selling drugs.

Exercise 8

Your own Answers