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A．Left.
B．Right.
C．Backwards.
D．Forwards.
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单项选择题What is the appropriate title for the passage

A．Smart Highway Projects—The Ultimate Solution to Traffic Congestion.
B．A Quick Fix Solution for the Traffic Problems.
C．A Venture to Remedy Traffic Woes.
D．Highways Get Smart-Part of the Package to Relieve Traffic Gridlock.

单项选择题Which of the following statements can be inferred from the passage

A．People are still searching for better solutions to the traffic problem.
B．Smart-highway technology is the ultimate solution to traffic gridlock.
C．High-tech approach can solve traffic gridlock entirely.
D．The traffic problems will be solved completely in the next 20 years.