单项选择题

There was a noisy（）at the back of the hall when the speaker began his address.

A. interaction
B. irritation
C. disturbance
D. interruption

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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

Communication orally involves more than reading or talking, gesture, posture, movements may all be______to it.

A. intrinsic
B. coherent
C. appealing
D. submissive

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