-You didn't send me an e-mail last night, did you?            

-Sorry. My computer ______________, so I couldn't get online.       [ ]

A. broke down    

B. broke off        

C. broke out    

D. broke into

胆盐可协助下列哪一种酶消化食物（）

A.胰蛋白酶

B.糜蛋白酶

C.胰脂肪酶

D.胰淀粉酶

E.肠致活酶