题干
——Canada is one of the largest______ in the world.
——That is, it is larger than ______ country in Asia.
A：country; any other
B：countries; any other
C：countries; any
答案(点此获取答案解析）
C
W同主族；Y的原子序数是W和X的原子序数之和的一半；含Z元素的物质焰色反应