单项选择题

The private detective, having received new information from a confidential source, narrowed down the ______ of his enquiry into the case.

A．aspect
B．sphere
C．dimension
D．scope
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单项选择题
in 1955 Martin Luthor King, Jr., gained national ______ for his nonviolent methods used in a bus boycott in Montgomery.
A．realization
B．permission
C．recognition
D．revolution
单项选择题
No one could come up with an easy solution to the government' s predicament—labor ______. which is caused by the wars.
A．decline
B．vacancy
C．rarity
D．shortage
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