单项选择题

The most important economic activity in Canada is ______.

A．mining
B．fishing
C．farming
D．manufacturing
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单项选择题
The leading ______ state in the United States is Wisconsin.
A．wheat
B．rice
C．dairy
D．maize
单项选择题
______ has become the world's largest exporter of fish.
A．Canada
B．The United States
C．Australia
D．Britain
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