单项选择题

According to Larson, to redress the traffic problem, ______.

A．car pooling must be studied
B．rapid mass transit system must be introduced
C．flexible work hours must be experimented
D．overall strategies must be coordinated

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单项选择题

The compound word quick-fix in Paragraph 1, sentence 3 is closest in meaning to ______.

A．an optional solution
B．an expedient solution
C．a ready solution
D．an efficient solution

单项选择题

According to the passage, the smart-highway technology is aimed to ______.

A．develop sophisticated facilities on the interstate highways
B．provide passenger vehicle with a variety of services
C．optimize the highway capabilities
D．improve communication between driver and the traffic monitors