—What are on show in the museum?  

—Some photos_________ by the children of Yushu, Qinghai.   [ ]

A. have been taken      

B. were taken  

C. are taken              

D. taken

病毒感染的治疗一般用

A．抗生素

B．免疫球蛋白

C．输血

D．干扰素

E．阿司匹林