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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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
单项选择题
In regard to the production of goods in greater quantities, the author states that ______.
A．the price of the goods should drop
B．the quality of the goods should improve
C．the price and the quality should both rise
D．the quality and the price should both drop
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