题目

III. 完形填空(共20小题;每小题分，满分20分) 阅读下面短文，从短文后所给各题的四个选项(A、B、C和D)中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。                    Catch of a Lifetime He was 11 years old and often went fishing in a lake. On the day   36   the bass (鱸魚) season opened, he and his father were fishing early in the evening,   37   sunfish. Then he practiced casting. When his pole   38  , he knew something huge was   39  . His father watched   40   as the boy skilful小明同学用如图所示的装置研究光的反射规律，其中有一个可折转的光屏．（1）光屏在实验中的作用是：①_____；②_____；（2）实验时，光屏应如何放置_____？（3）改变_____（选填“入射光线”或“反射光线”）的方向，多测几组入射角和反射角，并记录（数据如表）．由上述数据可知：入射角和反射角的关系是_____．实验次数入射角反射角115°15°230°30°345°45°（4）如图乙所示，将呈现反射光线的纸板向后弯折，_____（选填“能”或“不能”）看到反射光线．