单项选择题

Books found in second-hand bookshops may ______.

A．be on sale dozens of times
B．be rare first printings
C．all be sold
D．be well worth what is charged for them
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单项选择题
What does the word ethnic mean
A．Younger.
B．Major.
C．Relating to a particular racial, national group.
D．Religious.
单项选择题
Higher level classes are taught mainly through ______.
A．giving a lot of lectures to students
B．involving students in discussions
C．asking students questions in class
D．answering students' questions in class
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