问题
选择题
Canada has vast areas of wilderness, from the Arctic north, _______ average winter temperatures are usually -20 0C, to the border with the USA in the south, _______ is said to be the longest border in the world not defended.
A．which, where
B．whose, which
C．where, where
D．where, which
答案
答案：D
考查定语从句。句中where引导定语从句，先行词为the Arctic north，在从句中作地点状语；which引导非限定性定语从句，指代前面的事情。故选D。