对常见的贮粮害虫的主要防治方法有:()
A、密闭防虫、胜盖防虫
B、生姜防虫、海带防虫、花椒防虫
C、暴晒杀虫、开水杀虫
D、药剂杀虫
参考答案:A, B, C, D
— Would you go to the concert this evening?
— Sorry. ________ tomorrow's lessons, I have no time to go out with you.[ ]
A. Not preparing
B. Not having prepared
C. Not to prepare
D. Being not prepared
头脑风暴应遵循以下原则( )。
A.畅所欲言
B.标新立异
C.多多益善
D.改进补充