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
单项选择题 The St.Lawrence and（）together form an important transportation network for eastern Canada.
单项选择题 he longest river in Canada is（）.
单项选择题 Canada.s largest city is（）
