化学消毒方法有()
A．喷雾
B．擦拭
C．浸泡
D．熏蒸
E．日晒
参考答案：A, B, C, D
---Why are you so _______,Amy?
---I thought I lost my purse, but I didn’t. I found it in my study!
A．angry
B．happy
C．sad
D．Nervous
烃类按照分子结构和性质，可以分成链烃和环烃两大类。
