Đáp án unit 11 sách bài tập tiếng anh 11
READING
Part 1. Read the passage and then.do the exercises that follow.
Life on earth depends on the sun. Day after day we see its light and feel its warmth, but we do not often consider its origin. Yet there are many remarkable things about the sun. One is its distance from the earth. This is about ninety-three million miles. A journey of this distance, even if it could be made, would take several hundred years even in the fastest rocket.
The sun is a large star. The planet earth is very small in comparison. One hundred and nine globes the size of the earth would be needed to stretch from one side of the sun to the other. The sun makes us feel hot, even at a distance of ninety-three million miles. This is not surprising. The temperature on the sun is about ten thousand degrees Fahrenheit. But we receive only a small part of this heat. The total heat of the sun could melt a column of ice two and a quarter miles thick and ninety-three million miles high in one second.
The brightness of the sun” is equally astonishing- The sun gives such a bright light that 1,575,000,000,000,000,000,000 (one thousand five hundred and seventy five billions and billions) of wax candles would be needed to give an equal light. This very long row of figures gives us some idea of the brilliance of the sun. As we said earlier, we receive only a very small part of the sun’s heat. We also receive only a very small part of its light. This is sufficient for the growth of trees and plants, and for the existence of living creatures on earth. Too much heat and light would destroy the balance of life. The heat and light from the sun come in just the right quantities for life on earth.
Exercise 1. Decide whether the following statements are true (T) or false (F)
Exercise 2. Choose the best option A, B, C or D to complete each of the sentences.
1. Life on earth would not be possible______ it got sufficient light and heat from the sun.
| A. unless | B. if | C. because | D. though |
2. The size and the heat of the sun are two of______ things about the sun.
| A. normal | B. usual | C. sufficient | D. astonishing |
3. The earth receives_____of the light and heat of the sun.
| A. most | B. not any | C. little | D. some |
4. _____light and heat from the sun would destroy the balance of life on earth.
| A. Sufficient | B. Insufficient |
| C. Too much | D. Both B & C |
Part 2. Read the passage and choose the best option A, B or C to complete each of the following sentences.
Most of our energy comes from coal, oil and gas. One day these fossil fuels will all be consumed. We should be careful now how we use them and make plans for using less. Our attitudes to energy in the next 20 years will affect the entire planet for centuries. Generating electricity from the wind is a good, clean source of energy to some, but an intrusion on the landscape to others. One critic described them as “like toilet brushes disfiguring the countryside”.
Tropical forests are immensely rich. They may cover only six per cent of the earth’s surface, but they support over two-thirds of the world’s plant and animal species. Scientists believe that a quarter of a million plant species could be made extinct in our children’s lifetime largely because of forest destruction. The forests are a vital source of medicinal plants and so by destroying forests, we may be destroying the drugs which could cure cancer and other serious diseases. In the time it takes you to do this exercise, four more species will have become extinct.
More than three quarters of the world’s fresh water is locked in the ice-caps of the Arctic and the Antarctica. A small amount of this pure water would be sufficient to transform the dry areas of the world into fertile land. Engineers think that it would be possible to transport an iceberg of up to 10 kilo metres in length using a tug the size of a supertanker to pull it. The Sahara Desert has the advantage of being close to the sea and could be irrigated using water from the iceberg without the expense of long-distance pipelines.
1. Wind power is thought of as______ .
A. the best way to save energy
B. a main source of alternative energy
C. one clean source of energy
2. _____ is believed as the main cause of plant and animal species extinction.
A. Reforestation
B. Deforestation
C. Using medicinal plants
3. About one quarter of the world’s fresh water is_______ .
A. not in the form of ice-caps
B. locked in the ice-caps of the north and south polar
C. sufficient for use in the Sahara desert
Đáp án
Part 1.
Exercise 1.
| 1. F | 2. T | 3. F | 4. F | 5. T |
Exercise 2.
| 1. A | 2. D | 3. C | 4. D |
Part 2
| 1. C | 2. B | 3. A |
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