在“感往昔之沦丧”中，“感”之义为（）
A.感慨
B.为……感慨
C.感动
D.为……感动
参考答案：B
—Must I finish the exercise this afternoon?
—Yes, you _____ , but you _____ finish it right now. [ ]
A. must; mustn't
B. must; don't have to
C. may; needn't
D. may; mustn't
集中式危险废物焚烧厂不允许建设在人口密集的（）区域。
A.工业区
B.居住区
C.商业区
D.文化区
