单项选择题

By means of induction and deduction, ______.

A．scientists create theories based on Nature
B．ordinary people fulfill daily activities
C．ordinary people benefit from Nature
D．scientists develop skills in science work
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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.
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.
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