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
When he lived in Tibet in the 1950s, radio was the only means he had to keep ______ of current events in the country.
A．response
B．track
C．record
D．trace
单项选择题
It is the central government that has ______ the coastal economies preferential policies.
A．delivered
B．granted
C．submitted
D．given
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