单项选择题

The author believes that in a nation where free enterprise (自由企业制 ) exists , manufacturers will produce ______.

A．as much as they like
B．better quality merchandise (商品)
C．more than they are able to sell
D．both A and B
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单项选择题
When the demand for facial tissues increased, ______.
A．the supply was quickly exhausted
B．its price went up
C．the manufacturers tried to improve its quality
D．more manufacturers went into the business of making tissues
单项选择题
According to the passage we can see that lower prices and better quality occur _____.
A．as a result of the effect of one on the other
B．always at the same time
C．independently of each other
D．when the demand exceeds the supply
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