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
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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