In the eyes of Premier Wen Jiabao, there is never ______ thing as far as peasants are concerned. [ ]

A. too small a

B. a too small

C. such small a

D. a such small

从迁移产生的方向看，迁移可分为______和______，前者指先前学习对后继学习的影响，后者指后继学习对先前学习的影响。