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
The cure for lung cancer ______.
A．can be found before long
B．is available if one needs it
C．is unknown at present
D．will be found before you need it
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