题型：补全对话，情景问答 给下列的问句选择对应的答语。( ) 1. Who is this? ( ) 2. What do you like? ( ) 3. Can you dance? ( ) 4. What are these? ( ) 5. What shape is it? ( ) 6. What's this? A. These are my shoes.B. Yes, I can. C. It is a tiger.D. I like juice. E. This is my father. F. It's a rectangle. 查看答案
题型：多选题 如图所示，一轻质弹簧竖立于地面上，质量为m的小球，自弹簧正上方h高处由静止释放，则从小球接触弹簧到将弹簧压缩至最短（弹簧的形变始终在弹性限度内）的过程中，下列说法正确的是（ ）A．小球的机械能守恒B．重力对小球作正功，小球的重力势能减小C．由于弹簧的弹力对小球做负功，所以小球的动能一直减小D．小球的加速度先减小后增大 查看答案
