单项选择题

A．Sailing a boat.
B．Catching a worm.
C．Fishing.
D．Hanging clothes.
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单项选择题
In discussing the marketing concept, the author focuses on______.
A．its social impact
B．its theoretical basis
C．its possible consequence
D．its main characteristic
单项选择题
In the United States, people usually spend about 80-90% of our time inside buildings.
A．Y
B．N
C．NG
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