Номер 6, страница 40 - гдз по английскому языку 11 класс (starlight) сборник грамматических упражнений Мильруд

6. Choose the correct variant.

Many snakes living in the sea and on land are incredibly venomous. 1) , the consequences are fatal. If a snake 2) just once, the venom would be enough to kill 250,000 mice or 20 humans although it has never happened. If the venomous creatures 3) venom, they would be unable to overpower prey without risking their own neck. The production of venom takes a lot of energy but if the production of venom 4) , this ability would have vanished thousands of years ago. If the danger of venom 5) to the size of the creature, we 6) the scale of danger but this is not the case. If a scorpion 7) and scary-looking, it 8) that it is not the most dangerous. Instead, it is the smallest bug that we had better avoid. If for natural selection it 9) important to give more venom to the giant scorpions, humans 10) that from their experience. The truth is that if a predator is small, weak and slow, it 11) more powerful venom to kill instantly avoiding the struggle. Natural laws are wise. If all mammals could be killed by snakes, no living creature 12) on Earth. However, hedgehogs, rats and mice can survive snake bites. Besides, if scorpions 13) enemies of their own, they would now dominate the world. But, some vipers feed on scorpions and possess venom that is highly toxic for scorpions. Besides, if sea snakes 14) bigger jaws, they could kill humans but because of small teeth they rarely bite anything larger than a fish. Evolution also has a say. Moreover, if the marbled sea snake did not feed on eggs, it 15) its venom but this snake is not a hunter any more.

1) a) If they bit c) If they bite

b) If they have bitten d) If they had bitten

2) a) bit c) had bitten

b) has bitten d) bitted

3) a) did not possess c) has not possessed

b) have not possessed d) possessed

4) a) made sense c) has made sense

b) would have made sense d) made no sense

5) a) was linked c) had linked

b) were linked d) had been linked

6) a) could predict c) can predict

b) could have predicted d) could be predicting

7) a) was big c) is big

b) were big d) has been big

8) a) did not mean c) were not meant

b) would not mean d) does not mean

9) a) would have been c) was

b) were d) is

10) a) will know c) have known

b) would know d) would have known

11) a) does not need c) needs

b) will need d) will not need

12) a) would be left c) were left

b) would have been left d) was left

13) a) had c) did not have

b) have had d) have not had

14) a) had not had c) did not have

b) have not had d) had

15) a) would have lost c) would lose

b) would not have lost d) would not lose

6. Выберите правильный вариант.

Ответ:

1) c) If they bite
Если они кусают

2) a) bit
укусила

3) a) did not possess
не обладали

4) d) made no sense
не имела смысла

5) b) were linked
была связана

6) a) could predict
могли бы предсказать

7) c) is big
большой

8) d) does not mean
не означает

9) b) were
было

10) b) would know
знали бы

11) c) needs
нуждается

12) a) would be left
осталось бы

13) c) did not have
не имели

14) d) had
имели

15) b) would not lose
не потеряла бы