单项选择题

The Interior Plains lie between () and ().

A. the Canadian Shield/the Appalachian Region
B. the Canadian Shield/the Rocky Mountains
C. the Great Lakes/the Arctic Islands
D. the Appalachian Region/the Great Lakes

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单项选择题

The longest river in Canada is ().

A. the Mackenzie
B. the St. Lawrence
C. the Severn
D. the Yukon