My father, Mr. White, often __________ at six twenty in the morning.
A:get up
B:go up
C:gets up
D:go to bed
下列单细胞生物中,对人类有害的是( )
—Come on, Sandy. Everybody will be lucky or ____(成功的) sometime in their life.
—Thanks, I'll try again.
用显微镜观察玻片标本时,发现视野中央有一个污点,移动玻片或者转动目镜污点均不动,则污点在什么结构上?( )
下列说法中正确的是()