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
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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
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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