He was ill in hospital. His teacher looked after him                        .           [ ]

A. as good as possible            

B. as soon as possible            

C. as well as possible            

D. as better as possible

关于小孔成像，正确的是（　　）

A．小孔成像实验中，小孔越大成像越清楚

B．小孔成像实验中，小孔越小像越亮

C．小孔成像实验中，小孔一定要是圆的

D．小孔成的像，一定是倒立的