单项选择题

The police have asked for the ______ of the public in tracing the whereabouts of the missing boy.

A．cooperation
B．advice
C．helpfulness
D．aid
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单项选择题
Their distribution is also, sometimes, widely spaced, in places, closely packed together. ______
A．various
B．alternative
C．variable
D．conventional
单项选择题
During the heavy fog in the city, the traffic ______.
A．came to a standstill
B．came to an end
C．came to a conclusion
D．came to no result
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