考研英语每周4题

An important factor in a market-oriented economy is the mechanism by which consumer demands can be expressed and responded to by producers. In the American economy, this mechanism is provided by a price system, a process in which prices rise and fall in response to relative demands of consumers and supplies offered by seller-producers.

Question：The first two sentences in the second paragraph tell us that ________.
A. producers can satisfy the consumers by mechanized production
B. consumers can express their demands through producers
C. producers decide the prices of products
D. supply and demand regulate prices

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考研英语一周4题详解：订阅与退订