A:that; being
B:all that; be
C:that all; are
D:what; i
下图是西安市附近略图,根据此图回答历史上,西安市作为古都的区位因素是( )
①地形②气候③河流④资源
①苍蝇 ②蜜蜂 ③蜻蜓 ④蚂蚁