清代华北大旱，赤地千里，河北及山东的饥民，大批出山海关，移民于东北。回答第4题。地理学中最适于用来解释华北人口迁移的概念是（ ）
| A．交通易达性 | B．人口增长模式的转变 |
| C．经济区域专业化 | D．环境人口容量变化 |
-----Hurry up. Xiao Shenyang is coming.
------ Oh, I was afraid that we_____.
| A．already miss him | B．had already missed him |
| C．will miss him already | D．have already missed him |
She was ____ with me for_____particularls, because her husband didn’t come back. all the night from watching. a multi-national naval parade in Qingdao.
A. curious ; fartherB, eager; moreC. urgent ; furtherD.hasty; less
The decide to_______ their holidays until next month for watching a multi-national naval parade in Qingdao.
| A．delay | B．decay | C．put off | D．deliver |
----- When was the People’s Liberation Army’s Navy founded?
-----It ____the April of 1949.
| A．dates to | B．dated back | C．dated from | D．dates back to |
A naval parade can provide a platform, _____ navies on behalf of different nations can communicate.
| A．in which | B．through which | C．where | D．that |