题目

There are four season in a year: spring, summer autumn and winter. Spring is the best season of the year. The weather gets warmer and the days get longer. The crops begin to grow. The trees turn green and flowers come out. Summer comes after spring. It is the warmest season. It often rains and the crops grow fast. The best sport in summer is swimming. Children often go swimming in rivers and lakes. Autumn is a busy season. The days get shorter and the nights get longer. It is harvest time. The farmers are busy. They are getting in the crops. Winter is the coldest season of the year. S 在探究光的反射规律时，老师把一块平面镜CD竖立在讲台上，坐在B点的甲同学通过平面镜看到了坐在A点的乙同学．在这一现象中，光线的反射角是 [　　] A．∠1 B．∠2 C．∠3 D．∠4