单项选择题

Revolutionary developments in both observational and theoretical astronomy ______ in the 1960' s.

A．disputed
B．occurred
C．interfered
D．commended
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单项选择题
I don' t understand why such a good man has been treated with such scorn and ______ .
A．defection
B．defense
C．difference
D．indifference
单项选择题
The teacher rather than the students ______ the mistakes.
A．is responsible for
B．are responsible for
C．is responsible to
D．are responsible to
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