单项选择题

Will you participate ______ the coming dancing party.'

A．at
B．on
C．with
D．in
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单项选择题
What is the most important service of trees to man according to the passage
A．They offer him shade.
B．They help him stop droughts and floods.
C．They provide him wood.
D．They help him make money.
填空题
( )宴会厅 ( )开房
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