单项选择题

A．Current issues are kept on the shelves.B．Back issues ……

A．Current issues are kept on the shelves.
B．Back issues are bound together in volumes.
C．The procedure of borrowing a back issue is slightly different from that of a book.
D．Current issues of periodicals are put on microfilm.

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单项选择题A．twoB．threeC．fourD．five

A．two
B．three
C．four
D．five

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填空题however→while