题目

The teacher got the students __________ all the words they didn’t know.    A. looked up      B. looking in        C. to look up        D. look at   答案：C眼球成像的正确途径是（　　）A．物体反射的光线→晶状体→玻璃体→角膜→瞳孔→视网膜B．物体反射的光线→瞳孔→玻璃体→角膜→晶状体→视网膜C．物体反射的光线→角膜→晶状体→视网膜→瞳孔→玻璃体D．物体反射的光线→角膜→瞳孔→晶状体→玻璃体→视网膜