已知$x\in \left(0,\frac{\pi }{2}\right)$,且函数$f\left(x\right)=\frac{1+2{\sin }^{2}x}{\sin 2x}$的最小值为b，若函数$g\left(x\right)=\left\{\begin{array}{c}-1,\left(\frac{\pi }{4}<x<\frac{\pi }{2}\right)\\ 8x^2-6bx+4,\left(0<x\le \frac{\pi }{4}\right)\end{array}\right.$,则不等式$g\left(x\right)\le 1$的解集为（   ）

积极的倾听是成功交往的重要技巧之一。当好朋友向你诉说最近的烦恼时，你应当（    ）

①认真倾听，不随意打断对方       ②随时插话，妄加评论

③体谅对方的感受，积极回应       ④保持专心与尊重的态度

    How to spend a rainy day with your friends?   

    You don't have to be bored on a rainy day. Here are some new ideas:

    ____. You might tell stories you have heard before, or you might make up some really wonderful stories.

    ____. You can learn to cook a pizza or maybe some cakes. Give your friends a chance to help in the kitchen and make something tasty.

    ____. You might write stories on your own and then read them aloud to others, or you might write a story together.

     ____. Think of some scenes and then play a game. Act as teachers, doctors, nurses or policemen. You can dress up in whatever you may have.

    ____. Pick out some music and dance around in the room. You can also sing while others are dancing.

    So on the next rainy day, try some of these ideas for a day full of fun.

已知直线x+ay﹣1=0是圆C：x²+y²﹣4x﹣2y+1=0的对称轴，过点A（﹣4，a）作圆C的一条切线，切点为B，则|AB|=（　　）

用性引诱剂诱杀农业上蛾蝶类害虫利用的原理是（　　）