包装技术中常用的驱虫剂有（）。
A.荼
B.对位二氯化苯
C.樟脑精
D.氧化钠
E.二氧化碳
参考答案：A, B, C
She tried to finish all the work in one day but finally _____ and had to take a rest. [ ]
A. broke away
B. broke up
C. broke down
D. broke out
A．通草球一定带电
B．通草球一定带负电
C．通草球一定带正电
D．通草球一定不带正电
