单项选择题

What is the main idea of the passage

A．During the 1970s, old buildings in many cities were recycled for modern use.
B．With government support, people could recycle old buildings.
C．Experts did quite a lot to fight urban decay.
D．Recycling old building became a reality in Boston in the 18th century.

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单项选择题

What is the author's opinion of the San Antonio project

A．It is better than the other projects discussed.
B．It is a good project for other cities to follow.
C．San Antonio's leaders use other machines instead of bulldozers.
D．The work done on the river was more meaningful than the work done on the buildings.

单项选择题

Which of the following statements is true according to the passage

A．When the price of a product goes up, there will be a greater demand for it.
B．It's up to the customer as to how much he/she pays for certain goods.
C．Seller-producers have to keep immediate track of market in order to be successful.
D．Supply and demand are always well-balanced in a market-oriented economy.