题目

 In order to ____ a living, he left his hometown at the age of 15 and set foot in a strange city. A. have       B. take        C. do        D. make 答案：D某物体在运动的过程中，重力对其做功100J，则物体的（　　）A．动能一定增加100JB．动能一定减少100JC．重力势能一定增加100JD．重力势能一定减少100J