A:both the singer and the dancer
B:Either the singer or dancer
C:The singer or dancer
D:The singer and dancer
列宁说:“没有革命的理论,就不会有革命的行动”,下面理论(思想)与行动对应错误的是( )
在制作洋葱鳞片叶内表皮细胞临时装片时,下列叙述正确的两项是( )