Anna hasn't come to school today. I think she _______ be ill. [ ]

A. can

B. has to

C. may

D. should

厚朴药材的性状鉴别特征是（）

A.剥去外层，迎光检视有闪烁的小亮点

B.内表面淡灰黄色或浅棕色，有细纵纹，常见发亮的结晶

C.内表面紫棕色或深紫褐色，划之显油痕；质地坚硬，断面富油性，有时可见细小发亮的结晶

D.断面中间有黄棕色线纹，内侧红棕色油润

E.断面中间有多条黄棕色线纹