单项选择题

The problem with slang and trendy expressions is ______.

A．that they are out - of - date
B．that they are difficult
C．that they change fast
D．that they mean nonsense
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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 _________ is a major river of North Americ
A． SeineB. ThamesC. MississippiD. Danube
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