单项选择题

Problems like this ______ every day in the factory.

A．raise
B．rise
C．get
D．arise
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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
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
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