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.
填空题
According to Bob Bernhard, in order to reduce road noise, people must change ______.
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