A:Go ahead
B:All right
C:Exactly
D:Fine
实验是科学探究的重要途径,请根据图示回答相关问题.
在平行四边形ABCD中,点P从起点B出发,沿BC,CD逆时针方向向终点D匀速运动.设点P所走过的路程为x,则线段AP,AD与平行四边形的边所围成的图形面积为y,表示y与x的函数关系的图象大致如下图,则AB边上的高是( )
- Our head teacher is responsible for his work. He spends most of his time with us.
- ________ He always communicates with our parents in his free time.
世界人口加速增长阶段出现在 ( )