单项选择题

He always makes______of some humorous remarks into his rather serious lectures, so we say he is a good speaker.

A．injections
B．interruptions
C．inserts
D．insides
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单项选择题
Too much______to X-rays can cause skin burns, cancer or other damage to the human body.
A．disclosure
B．exhibition
C．contact
D．exposure
单项选择题
I m afraid that this border raid is the______to more serious attacks.
A．description
B．prelude
C．persuasion
D．possession
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