单项选择题

Questions 16 to 18 are based on the passage you have just heard.

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.
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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.
单项选择题
A. The workers on the underground platforms were replaced by machines.B. It became the first completely automatic railway in the world.C. A completely automatic line was added to its network.D. Its trains became computer-controlled.
A. The workers on the underground platforms were replaced by machines.
B. It became the first completely automatic railway in the world.
C. A completely automatic line was added to its network.
D. Its trains became computer-controlled.
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