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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热门试题

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

单项选择题

Improved quality of facial tissues resulted from ______.

A．mass—production methods
B．popular demand for a better product
C．a decrease in production costs
D．competition among manufacturers