单项选择题

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单项选择题
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.
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.
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.
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