74．What is the report mainly about?

　　　　 A．How to grow vegetables in hot areas. 　　

　　　　 B．How to grow crops in tropical climates.

　　　　 C．How to cool the soil.　　　　　　 　　　　

　　　　 D．How to use sea water.

73．Sea water mentioned in the passage is mainly used to________.

　 　 A．water the farms　　 　　　　　　　　　　　　　　　　　 B．water the gardens　　

C．cool the air　　　 　　　　　　　　　　　　　　　　　　　　　 D．make the earth cool

72．What does the new system enable the gardeners to do?

　 　 A．Water the field with seawater.　　　　　　　　　

　　　　 B．Grow asparagus in hot places.

　 　 C．Grow cool climate vegetables in hot areas.　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　

　　　　 D．Cool the soil.

71．In larger cities, the fumes from coal and oil may contribute to ___________.

A．heart disease　 　 　　　　　　　　　　　　　　　　　　　　 B．lung diseases　 　　 　

C．loss of clear vision　　 　　　　　　　　　　　　　　　　 D．serious headache

　　　　　　　　　　　　　　　　　 E

Did you know that vegetables can grow in the climates they are not used to? Cool climate vegetables like asparagus (芦笋) are now able to be grown in places as hot as Hawaii. In Hawaii, marine (海的)engineers have been able to actually let you believe such vegetables that they are living in cooler climates. In that way they grow faster and taste better. What these engineers have been using is very simply cold sea water. How did they use it? They place pipes in the soil and cold water flowing through them cools the earth. This causes plant growth and enables gardeners in tropical climates (热带气候) to grow crops from cooler climates. Also some of these pipes are exposed to the air and they make the air “wet” and thus water the gardens. What especially makes people happy about this process (过程) is that nothing to the natural conditions is being used. Another new use for cold ocean water is to cool buildings. Engineers believe that for example the entire west coast of the United States could be air-conditioned using seawater.

70．The fumes from coal and oil may cause metal ______.

A．to turn black　 　　　　　　　　　　　　　　　　　　　　　　　 B．to become rusty　 　　　　　　　　　　　　　　　　　　　　

C．to corrode　 　　　　　　　　　　　　　　　　　　　　　　　　　　 D．to twist

69．Why is air pollution more grave in the city than in the country?

　　 A．Because there larger populations in cities.

　　 B．Because the air in the city is dirty.

　　 C. Because there are more cars in the city.

D. Because there are much more gas fumes from cars and burning of coal and oil for energy

　 in the city than in the country.

68．What is the purpose of this passage?

　　 A．to persuade people to stop polluting the air

　　 B．to tell the causes of air pollution

　　 C．to tell why cities are bad places to live

　　 D．to describe why cities are bad places to live

67．The key point of the passage is that _________.

　　 A．the cause of air pollution is people

　　 B．the causes and the effects of air pollution are both found in cities

　　 C．the effects of air pollution range from headaches to death

　　 D．air pollution is caused by dirty air

66．What did the author feel about his / her performance?

　　 A．He / She thought it was comfortable and successful.

　　 B．He / She thought it was very difficult but successful.

　　 C．He / She thought he / she had never made a mistake during the performance.

D．He / She thought he / she played through the piece carefully but light-heartedly.

D

　　 People and the sources of air pollution are found in the same places. This means that cities with large populations have the biggest problem of dirty air. Air pollution is caused by many different things. A major source of air pollution is the gas fumes from cars. Statistics show that 93 percent of all auto trips are within cities. Another major source of dirty air is the burning of coal and oil for energy. This energy is needed to make electricity. Of course, much more electricity is used in the city than in the country.

　　 On the average, we throw away more trash and garbage than the year before. The burning of garbage contributes to air pollution. Many major industries are also responsible for the dirty air in the around cities. The fumes from iron, steel, chemical, and petroleum production add particles to the air.

　　 The effects of air pollution range from mild headaches to death. The levels of pollution found in heavy for traffic may cause headaches for loss of clear vision. Wherever coal and oil are used for fuel, fumes may kill trees and plants and cause metal to corrode. In some of the larger cities, these fumes endanger the live of human beings by contributing to lung diseases and causing early death.

65．The author _________.

　　 A．didn’t make any mistake in the performance

　　 B．felt better at the beginning of the performance

　　 C．paid all attention to nothing but his / her performance

　　 D．lost his / her concentration sometimes during the performance