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
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
单项选择题
Because there is evidence of severely harmful effects from chemical dumps, the government has tougher cleanup measures.
A．innovated
B．imposed
C．implemented
D．inflicted
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