导致产业活动地域联系的主要原因是
①资源的地区差异 ②区域经济发展的不平衡 ③人口密度的区域差异 ④政治体制的地区差异 [ ]
A、①②
B、③④
C、①③
D、②④
答案:A
--- What do you think about Chinese knot in the shop window?
--- Oh, it’s so beautiful. You may give it to Debbie as gift for the Dragon Boat Festival.
A.a; a
B.the; a
C.a; the
D.the; the
1,23,45,67,89,( )
A.1011
B.111
C.1101
D.101