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.
单项选择题
Which animal has returned to ocean and developed into the largest of all animal forms
A．The shark.
B．The seal.
C．The whale.
D．The dolphin.
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