单项选择题

Questions 11-13 are based on a conversation you are going to hear. What did Ed do during vacation

A．He worked for a radio station.
B．He lived in a dormitory.
C．He took a long trip.
D．He visited the man’s family.
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单项选择题
The advantage of chevrons over straight, horizontal bars is that the former ______.
A．can keep drivers awake
B．can cut road accidents in half
C．will have a longer effect on drivers
D．will look more attractive
单项选择题
What seems to be the man’s problem
A．He can’t sleep at night.
B．He can’t find a quiet place to study.
C．He can’t narrow down his research topic.
D．He can’t find enough information for his research paper.
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