Sofia looked around at all the faces: she had the impression that she _____ most of the guests before. A . has seen B . had seen C . saw D . would see 答案:B 读我国的人口分布图,回答下列问题:
(1)我国人口分布稠密的地区是_________,人口分布稀疏的地区是_________
(2)在我国人口分布上有一条重要的地理分界线,此线_________人口多,
人口少。这条人口地理分界线是__________。(请在图中画出来)