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
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
单项选择题
According to the passage, lung cancer ______.
A．is the major cause of death between the ages of 35 and 55
B．is most often caused by smoking
C．never affects non—smokers
D．has nothing to do with smoking
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