服用抗生素不当引起的相关性腹泻在治疗上宜选用()
A．免疫球蛋白
B．生态制剂
C．维生素
D．抗生素
E．无需治疗
参考答案：B
—You should______when you are having a class.
—Yes, I think so. [ ]
A. listen to the teachers carefully
B. read some sports magazines
C. listen to music
