题目

 With no rain for three months and food supplies _____ out, the situation here is getting from bad to worse. A. run       B. running     C. to run         D. to be run 答案：B（2013?兰州）如图所示的四种现象中，属于光的折射现象的是（　　）A．水中的倒影B．透过树叶间的阳光C．水中弯折的铅笔D．物体的影子