如图所示，为某质点（质量不变）运动过程中机械能（E）随速度平方（v²）变化的图像，关于该质点到零势能面竖直距离的变化，下列说法正确的是（   ）

用括号内所给动词的适当形式填空。
1.We ____(watch) the boys____ (play) basketball on the playground when something strange happened.
2.I don't know what ____(happen)to him just now.
3.Computers are useful to us. But some students only use them____ (play) games.
4.–--Would you mind____(take) photos with me?

5.--- Of course not. When I miss you, I can have a look.

6.You may go to play football as soon as your homework ____ (finish).
7.Middle school students____(tell) not to smoke.   

在$△ABC$中,$a=80,b=100,A={45}^{°}$,则此三角形解的情况是(     )

若$f\left(x\right)=\frac{1}{\sqrt{{\log }_{\frac{1}{2}}(2x+1)}}$，则$f\left(x\right)$的定义域为(    )

①理智面对学习压力

②找心理老师进行心理减压疏导

③学会调控自己的情绪

④考试成绩是判断个人价值的唯一标准