单项选择题

Questions 19 to 21 are based on the passage you have just heard.

A. It is being rapidly expanded. B. It is found in one million homes.
C. It is relatively new. D. It is very well established.
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单项选择题
A. They have central heating and air-conditioning systems.B. They have everything that people need.C. They are well-planned.D. Many people live in them.
A. They have central heating and air-conditioning systems.
B. They have everything that people need.
C. They are well-planned.
D. Many people live in them.
单项选择题
A. It will reduce the amount of pollutants in the air.B. It will increase the amount of unpleasant odors from vehicles.C. It will eventually destroy the ozone layer.D. It will reduce the cost of running large vehicles.
A. It will reduce the amount of pollutants in the air.
B. It will increase the amount of unpleasant odors from vehicles.
C. It will eventually destroy the ozone layer.
D. It will reduce the cost of running large vehicles.
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