پاسخ تمرینات درس سوم چهارم دبیرستان

P:23

1.Yes I am worried about it because it is the planet we live on and some human activities are damaging this planet.

2 .Cutting down the trees, burning fuels such as coal and oil, and polluting the air, the seas and the oceans are some of the things people do that damage the earth.

3 .By telling them about the bad effects of their actions, by making rules for the protection of the environment and making them obey those rules.

4 .Yes, the destruction of parts of the Ozone layer, destruction of some jungles, and extinction of some plants and animals.

5 .Yes, some people use solar energy instead of burning fuels, they also recycle trash, and use public transportation to help protect the environment.

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P26 part 1

1. (T) The greenhouse effect is dangerous for the planet.

2.(F) Scientists believe that human activities are the only reason for globalwarming.

3. (T) It takes a long time for the climate to change.

4. (N) If global warming is not stopped, human beings might think about living on other planets.

5. (T) You can help control global warming by using public transportation.

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P:26 part 2 A

3 2 1

6 5 4

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P:26 part 2 B

Scientists think that as we use more gasoline and electricity, the earth is going to get warmer.

They believe that we know enough about the problem, to take some action.

C) Trap means to keep something in a place.

Greenhouse gases like C02 and methane make the earth warmer by trapping heat in the atmosphere.

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P 27 part 3

1. I have planted trees and I have used public transportation.

2. I put recyclable rubbish such as paper, bottles, or boxes into a separate plastic bag.

or I use different plastic bags for different kinds of rubbish to help recycling them.

3. I would tell them that the earth is getting warmer and some human activities will make the problem worse. All of us should do our part to help control global warming.

4. Government can establish effective rules and make people obey those rules. People can use public transportation.

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P 27 part 1,2

1) a. Climate change is a change in general weather patterns.

b. Solar energy is the energy that comes from the sun.

2) a. forest is a piece of land with a lot of trees.

b. researcher is a person who studies something carefully to find out more about it.

c. trash means things that you do not want any more.

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P 28 part 2

of or about the whole world.

not too hot, not too cold

use less of something.

become smaller or less.

make something smaller or less.

of or using the sun.

not doing anything.

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P 29 part VOCAB

1. increase: decrease a. raise : lower

2. extinction: death c. concern : worry

3. coal : fuel b. electricity: energy

4. risk : danger b. reduce: decrease

5. researcher: laboratory a. professor: university

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P 30 part 2

It is almost the same.

Yes, omitting the relative pronoun (which, that, ...) and the verb "to be", the first sentence can be changed into the second one.

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P 30 part 1

1. The teacher advised us to read the article ( written) about the Greenhouse Effect.

2. The scientists (studying) the causes of climate change have made a lot of progress.

3. I met a group of scientists (concerned) abut environmental problems.

4. The book (written) about global warming became very popular.

5. The cars (releasing) greenhouse gases into the air are a danger to the environment.

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P 31 part 2

1. The cars releasing greenhouse gases into the air are a danger to the environment.

2. The scientists are talking about another problem caused by human beings.

3. Anyone interested in healthy living should exercise regularly.

4. The plastic bags produced in this factory are recyclable.

5. The cars making a lot of noise pollution must be stopped by the police.

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P 30 part 3

1. Acid rain created by burning of gas, oil and coal destroys forests.

2. Factories burning coal and oil help increase pollution.

3.The greenhouse effect enhanced by human activities is dangerous for the planet.

4. Trash believed to be useless can be burned to produce energy.

5. Farming produces another greenhouse gas called methane.

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