单项选择题

A strike by British Airways ground staff has led to the of flights between London and Manchester.

A．deficiency
B．slam
C．suspension
D．veto
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单项选择题
Attempts to restrict parking in the city center have further _________ the problem of traffic congestion, and sometimes the traffic comes to a complete stop in some places.
A．degraded
B．aggravated
C．amplified
D．diffused
单项选择题
If a scientist holds an idea to be true and finds any counter evidence whatever, the idea is either or abandoned.
A．modified
B．ascertained
C．testified
D．violated
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