Nothing is so easy as ________ parents to raise their expectations of their children too high.                                                             (2012·福建，33)

A．of

B．to

C．by

D．for

下列疾患可造成舌 * * 萎缩，除了

A．扁平苔藓

B．地图舌

C．口腔念珠菌感染

D．B族维生素缺乏

E．盘状红斑狼疮