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.
单项选择题
The significance of the finding is that ______.
A．people now know the number of chimpanzees is much smaller than expected
B．it may make it possible for scientists to discover new ways of treating AIDS.
C．it proves some deadly human diseases can also be transmitted to wild animals
D．it will soon help the scientists develop a vaccine that prevents the AIDS virus
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