单项选择题

The survey showed that ______ numbers of 15-year-olds were already smoking twenty cigarettes a week.

A．essential
B．steady
C．primary
D．substantial
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单项选择题
______ is the question of using existing resources to produce original and beneficial solutions, ideas or products.
A．Creativity
B．Productivity
C．Application
D．Combination
单项选择题
The goals and desires ______ widely between men and women, between the rich and the poor.
A．swing
B．vary
C．distinguish
D．transfer
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