在“汝今年余二十，目不存教，心不入道，无以慰我”中，“无以”之义为（）
A.没有
B.不能
C.不用
D.不可
参考答案：B
- My boss often made me work day and night.
- If I _______ you, I _______ the job. [ ]
A. am, will give up
B. had been, would have given up
C. were, would give up
D. had been, would give up
噪声作业点至少每（）进行一次频谱分析。
A.1年
B.半年
C.3个月
D.2个月
