人耳朵能分辨两次声音的最短时问间隔是0.1s,那么,常温下要听到高墙反射而形成的回声,人至少要离高墙( )
A.68 m
B.34 m
C.17 m
D.340 m
答案:C
Mr.Green stood up in defense of the 16-year-old boy, saying that he was not the one_____. [ ]
A. blamed
B. blaming
C. to blame
D. to be blamed
凡被实施社会治安综合治理一票否决的责任单位,在()内取消被评为文明、先进、模范等各种荣誉称号的资格。
A.半年
B.一年
C.二年