By improving reading skills, you can read faster and understand more of _______ you read．

A．that

B．what

C．which

D．whether

复发性阿弗他溃疡在口腔黏膜的少发部位是（）。

A.唇

B.颊

C.舌尖、舌缘

D.硬腭

E.前庭沟