单项选择题

Tom could hardly ______ his excitement as he knew that he had made a real discovery.

A．conceal
B．reveal
C．show
D．discover
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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
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
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