题目

      As the population of the planet increases, so does the amount of homes, businesses, parking lots, schools, airports and roadways. All these buildings use electricity and need to be lighted. Humans demand these lights. They want their homes more comfortable and they want their streets safe. The problem is that researchers are finding that all this light is having a negative effect on humans and wildlife as well.       Less than 10 years ago I drove to a less populated section of my town, lay down in the middle of the road and watched an attractive meteor shower(流行雨)20．沿一条直线运动的物体，当物体的加速度逐渐减小时，下列说法正确的是（　　）A．物体的速度一定增加的越来越慢B．物体运动的速度一定减小C．物体的速度变化量一定减少D．物体运动的路程一定增大