化学灭鼠
参考答案：
使用化学药剂杀灭鼠类的方法，也是目前主要的灭鼠方法
— Hi, Johnson, any idea where Susan is?
— It's class time, so she in the classroom now.
A. can be
B. must have been
C. might have been
D. should be
什么是总结式导语？
