单项选择题

Such euphemisms may be stylistically "permissible" if they are kept within______.

A．boundaries
B．ranges
C．borders
D．limits
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单项选择题
The words Francis Key wrote on the back of an old letter The Star Spangled Banner became the national ______ of the United States.
A．song
B．hymn
C．anthem
D．motto
单项选择题
The doctor recommends me ______ on a strict diet.
A．to go
B．going
C．I should go
D．go
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