在显微镜下观察到的小鱼尾鳍内血液流动的示意图中(箭头表示血液流动的方向),表示毛细血管的是( )
A:
B:
C:
D:
把一根木条钉牢在墙壁上需要____ 个钉子,其理论依据是:____
Hi,I'm Lili. I'm from China. I'm a____(student\teacher).This is my family. Look at the man,____(He's\She's)my father. Look at the woman,____(He's\She's)my mother.____(He's\She's)a____(student\teacher). I love my family.
Once the poison is________,there is no further danger.