单项选择题

Radio reception wasn't very good because of a disturbance in the atmosphere; the announcer's voice sounded very ______.

A．disputed
B．discarded
C．dismissed
D．distorted
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单项选择题
A system of strict discipline has a ______ effect on conduct.
A．automatic
B．deliberate
C．beneficial
D．customary
单项选择题
The students showed ______ when solving the difficult maths problems.
A．validity
B．purity
C．ingenuity
D．reliability
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