单项选择题

The chairman of the company said that new techniques had_______improved their production efficiency.

A．violently
B．severely
C．extremely
D．radically
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单项选择题
The meeting was so prolonged and exhausting that______ the speakers stopped for refreshments.
A．at ease
B．at random
C．at intervals
D．at large
单项选择题
A．matingB．excitingC．warningD．boring
A．mating
B．exciting
C．warning
D．boring
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