地面对入射太阳辐射的反射取决于地面的反射率（r），而r又取决于（）。
参考答案：地面的性质
__________for his disability made her quite unhappy. [ ]
A. Her son being laughed at
B. Her son to be laughed at
C. Her son's being laughed at
D. Her son's to be laughed at
我国历史上一次空前的思想解放运动是[ ]
A．洋务运动
B．戊戌变法
C．辛亥革命
D．新文化运动
