单项选择题

The following are good advice except ______.

A．dressing properly
B．asking what you don't know
C．offering coffee for others
D．inviting colleagues for dinner
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单项选择题
The original kites were used ______.
A．as a way to have a fun
B．as a signal
C．in religious ceremonies
D．as tools for study weather
单项选择题
The underlined phrase dry run in the third paragraph means______.
A．to run to work
B．to test the route in advance in person
C．not to make your feet wet on the way work
D．to walk as quickly as possible
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