Добавил:
Upload Опубликованный материал нарушает ваши авторские права? Сообщите нам.
Вуз: Предмет: Файл:
Ekologiya_New.pdf
Скачиваний:
495
Добавлен:
30.05.2015
Размер:
1.33 Mб
Скачать

4.I don't ride the bus to work every morning because it's always so crowded.

5.Sara didn't know that highway 57 was closed, so she didn't take an alternative route.

5.Camille couldn't finish unloading the truck because no one was there to help her.

3. Open the brackets and put the proper form of verbs.

1.I am not an astronaut. If I (be) were an astronaut, I (take) would take my camera with me on the rocket ship next month.

2.That sounds like a good job offer. I (accept) _____ it if I (be) _____

you.

3.Don't throw aerosol cans into a fire. An aerosol can (explode) you

(throw)

 

it into a fire.

4.It is expensive to call across the ocean. However, if transoceanic telephone calls (be) _____cheap, I (call) ______my family every day and (talk) _____ for hours.

5.The teacher was absent today, so class was canceled. If she (be) _____

absent if again tomorrow, class (cancel)_______ tomorrow, too.

6.Sea water is salty. If the oceans (consist) _________ of fresh water,

there (be) _________ plenty of water to irrigate all of the deserts in the world to provide an abundant food supply for the entire population of the earth.

4.Open the brackets and put the proper form of verbs.

1.If the population of one animal (increase), there would not be enough food and water for all the animals.

2.As the oxygen in the atmosphere (increase), a layer of ozone was formed, life would be impossible without it on the surface of the Earth.

3.If fire (destroy) the vegetation in a region, there will be certain changes.

4.Plants die if you (not / water) them.

5.Today life on the Earth (be) is in danger: if man himself will destroy the equilibrium of ecosystem by pollution.

6.If the Sun (not be ) there would not be light, heat, energy of any kind. 7.If factories (stop) pouring chemicals into lakes and rivers, there (be) more clean water.

5.Read and translate these pairs of sentences. Compare them.

62

1. If the population of one animal

1.If the population of one animal

 

increases, there is not enough food

increased, there would not be

 

and water for all the animals.

enough food and water for all the

 

 

animals.

2.

If fire destroys the vegetation in a

2.If fire destroyed the vegetation

 

region, there will be certain

in a region, there would be certain

 

changes.

changes.

3.

First grass and some flowers will

3.First grass and some flowers

 

grow.

would grow.

4.

Then insects will appear.

4.Then insects would appear.

5. The wind will blow the

5.The wind would blow the

 

seeds of small trees.

seeds of small trees.

6.

These trees will grow and

6.These trees would grow and

 

birds and animals will appear.

birds and animals would appear.

7. Life is impossible without

7.Life would be impossible without

 

a layer of ozone.

a layer of ozone.

8.Without the Sun there is no light,

8.Without the Sun there would be

 

heat, no energy of any kind.

no light, no heat, no energy of any

 

 

kind.

 

 

 

3. Make up sentences using conjunctions: when ,which, where, as, that

1.A gas without colour, ..... forms about four fifths of the air.

2.Organisms such as bacteria and fungi ..... decompose dead plants and animals.

3. The long-term process through ..... a population of organisms accumulats genetic changes that enable its members to successfully adapt to environmental conditions and to better exploit food resources.

4.Consider the evolution of the atmosphere: ..... life began there was no oxygen in the atmosphere.

5.It is a necessity for maintaining animal life and is the medium in .....

many animals live.

6. .... the oxygen in the atmosphere increased, a layer of ozone was formed, life would be impossible without it on the surface of the Earth.

7.Crops can grow and produce best in correct place ..... you know the microclimate of this or that part of the area.

63

Соседние файлы в предмете [НЕСОРТИРОВАННОЕ]