单项选择题

The weekly radio program is on ______.

A．research a number of topics
B．give an opinion on possible topics
C．produce a list of topics
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单项选择题
A．research a number of topicsB．give an opinion on possible topicsC．produce a list of topics
A．research a number of topics
B．give an opinion on possible topics
C．produce a list of topics
问答题
According to the passage, the development of full touring companies was aided by
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