单项选择题

A．To show special courtesy.
B．To make themselves understood.
C．To show their art of language.
D．To show their superiority.
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单项选择题
A．1 hour.B．2 hours.C．3 hours.D．4 hours.
A．1 hour.
B．2 hours.
C．3 hours.
D．4 hours.
单项选择题
A．Informal language and polite forms.B．Formal language and polite forms.C．Formal language and impolite forms.D．Informal language and casual forms.
A．Informal language and polite forms.
B．Formal language and polite forms.
C．Formal language and impolite forms.
D．Informal language and casual forms.
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