The boreal forests of Canada is ______ in size in the world.
A、second
B、third
C、fourth
D、fifth
【正确答案】：A
【题目解析】：This band of tree growth, which covers the southern portion of the Canadian Shield and stretches uninterrupted from the border with Alaska to the Atlantic coast, is second in size only to the boreal forests of Russia. 参见教材P264。
