单项选择题

The author asks learners ______.

A．to never use slang
B．to understand what these slang words mean
C．to take time to use slang often
D．to stick with official English
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单项选择题
How do people address a public official correctly
A．Professor or Doctor.
B．Father or Sister.
C．Mr. Chairman.
D．His Honor or Congressman.
填空题
is:were
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