题目

The young lady prefers dressing up for a party to ____ by others. A、be noticed B、being noticed  C、having been noticed   D、have been noticed   答案：A入射光线跟镜面的夹角由90°减小到60°, 则反射角从________变到________. [　　] A.90°　　B.60°　　C.0°　　D.30°