题目

_____ successful launch of China’s first lunar orbit “Chang’e-1” has sent _____ waves of excitement across the country.   A. A; the           B. The; the            C. The; /         D. /; the 答案：C平行光线射到平滑的表面(如平面镜)，其反射光线仍是________的．平静的水面对太阳光产生________反射，平行光线射到粗糙不平的表面，其反射光线向________反射，白色的墙壁对光产生________反射．