单项选择题

In Disneyland, every year, some 800,000 plants are replaced because Disney refused to ______ signs asking his "guests" not to step on them.

A．put down
B．put out
C．put up
D．put off
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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
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
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