单项选择题

The Austrian manufacturing industry consists of a few large organizations, many of which operate under government auspices.

A．supervision
B．orientation
C．regulation
D．sponsorship
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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
单项选择题
A considerable amount of time and money has been invested in ______ this system.
A．defining
B．implying
C．reducing
D．perfecting
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