单项选择题

A．The possible existence of life on other planets.
B．Methods for building powerful new telescopes.
C．A technical problem that astronomers can’t solve.
D．The discovery of planets orbiting distant stars.
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单项选择题
A．He should listen more to the teacher.B．He should take part in some social activities.C．He should make an appointment with his professor.D．He should learn to sing English songs.
A．He should listen more to the teacher.
B．He should take part in some social activities.
C．He should make an appointment with his professor.
D．He should learn to sing English songs.
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.
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