— Are you okay?
— ______ [ ]
A. Yes, I'm OK.
B. No, I'm OK.
C. I'm OK.
答案:A
She felt _____ of having asked such a silly question when the audience couldn't help laughing.
[ ]
A. guilty
B. crazy
C. miserable
D. ashamed
现代废水处理技术中,下列方法中属于化学法的是( )。
A.隔油 B.离心 C.活性污泥法 D.氧化还原