Let's do it at once, ?
A:shall we
B:will you
C:do we
某同学在显微镜下观察绿色植物叶的徒手切片,当转动细准焦螺旋时,有一部分细胞看得清晰,另一部分细胞较模糊,这是由于
His parents didn't earn much money so he dropped out of school because of p____(贫穷).