在观察凸透镜成像的实验中，把物体从距凸透镜2倍焦距之外，逐渐向凸透镜靠拢的过程中，光屏上所成的像将________。
一直变大
It was so dark that he ______.
A．didn’t dare to go out to fetch some water
B．not dared bring some water
C．dares to go out to bring some water
D．to dare to fetch some water
喷淋泵如何操作？
