单项选择题

Because of its intimacy, radio is usually more than just a medium; it is ______.

A．firm
B．company
C．corporation
D．enterprise
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单项选择题
All the key words in the article are printed in ______ type so as to attract readers' attention.
A．dark
B．dense
C．black
D．bold
单项选择题
He always did well at school ______ having to do part-time jobs every now and then.
A．in spite of
B．regardless of
C．on account of
D．in case of
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