青岛市2014
高考英语阅读理解、完形填空及阅读类训练（20）（答案及解析） you can not see any object unless light from that object gets into your eyes. some of the things you see give off light of their own. the sun, the stars, a lighted lamp are examples that can be seen by their own light. such things are luminous. most of the things you see are not giving off light of their own. they are simply reflecting light that falls on them from the sun or some other luminous bodies.
