A:2k﹣1
B:2k﹣1
C:2k
D:2k+1
新中国成立以来,我国民主法治遭到严重破坏,国家陷入崩溃边缘是在( )
研究化肥的合成、废水的处理等有现实的重要意义.
We are glad to hear that the terrorists ________ by the brave policemen several days ago.