题目

_________ to education , she spent much time communicating with the students and their parents.     A. Devoted   B. Devoting     C. Having devoted   D. Devote 答案：A质量0.8kg的小球被抛出去后，如不计空气阻力，则小球受到重力重力的作用．该力的施力物体是地球地球，力的大小是7.84N7.84N，力的方向是竖直向下竖直向下．