——Have you finished your homework yet?——No, not yet. I think it'll take me __________ half an hour.
A:another
B:other
C:others
D:the other
如图所示,闭合开关后能测出小灯泡L1两端电压的是( )
下列有关使用显微镜和临时装片制作的方法步骤的叙述中,正确的是( )