单项选择题

The oscillator was easier to use, more stable, and less expensive than others available at the time.()

A. changeable
B. unchanging
C. diverse
D. strong

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The article sketched the major events of the decade.
A. described

B. offered
C. outlined

D. presented
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Smoking will not be allowed in all public places here.()

A. forbidden
B. banned
C. permitted
D. promoted
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