—Why, my new computer is rubbish! Five hours has passed and it still hasn’t finished the downloading.

—Don’t worry. You know, sometimes the Internet ________ be very slow.

A．can

B．may

C．should

D．must

干燥淀粉在片剂中作为崩解剂的主要崩解原理是（）

A.毛细管作用

B.改善了颗粒的润滑性

C.酶解作用

D.膨胀作用

E.产气作用