单项选择题

The library already subscribes to at least one of the materials related periodicals published by them.

A．period
B．science
C．magazines
D．novels
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The salesman stood up for his product when challenged.
A．defended
B．sold
C．spoke of
D．stood out
单项选择题
Launched in the autumn of 1976 in London, and now published ten times a year.
A．Ended
B．Followed
C．Included
D．Started
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