Directions: In Part C, you will hear two short passages, and you will be asked three questions on each of the passages. The passages will be read twice but the questions will only be spoken once. When you hear a question, read the four possible answers in your paper and decide which one would be the best answer to the question you have heard.
Questions 15 through 17 are based on the following passage.
15.
A. He always sees black and white.
B. He can only see the colours of yellow and blue.
C. He is only blind to some of the colours.
D. He is blind to any colours in the evening.
正确答案是
16.
A. He can't see the traffic light.
B. He can't see the cars.
C. He can only see yellow and blue.
D. He cannot tell red from green.
正确答案是
17.
A. If one always makes his eyes too tired, he will become colour-blind.
B. The colour-blind people's parents must be colour-blind.
C. Doctors now have no idea about the reason of colour blindness.
D. People have begun to find out the reason of colour-blindness.
正确答案是
Questions 18 through 20 are based on the following passage.
18.
A. Thirty seven million square miles.
B. Seventy per cent of the world's surface.
C. Sixty-three million square miles.
D. Thirty per cent of the world's surface.
正确答案是
19.
A. Thousands of years of rain.
B. The earth's rivers.
C. The cooling of the burning gas and water vapour.
D. A mixture of the burning gas and water vapour.
正确答案是
20.
A. By calculating the amount of salt on the land.
B. By calculating the quantity of salt in the sea.
C. By measuring the length of the river.
D. By subtracting (减除) the amount of salt in the sea from the amount of salt on the land.
正确答案是
15. C 16. D 17. C 18. B 19. A 20. B