光的反射定律：光反射时，反射光线、入射光线与法线在同一 内；反射光线和入射光线分别位于法线的 ；反射角 入射角．
平面；两侧；等于．
—Excuse me.Could you please tell me __________?
—Sure.There’s a bookstore on River Road.
A．where can I get a dictionary
B．where could I get a dictionary
C．where I could get a dictionary
D．where I can get a dictionary
