如图，OA=4，线段OA的中点为B，点P在以O为圆心，OB为半径的圆上运动，PA的中点为Q.当点Q也落在⊙O上时，cos∠OQB的值等于（       ）

    Mr. Smith is my new friend. He1from Paris, France. He is a French2of a middle school. His students all like3very much. He can speak some Chinese,4not much. He wants to learn more, so he goes to5 classes every week. He likes living and working6China very much. He7 the Chinese people are very friendly(友好的). He has two8, Maria and Tom. They are students, but they go to different(不同的)9. They have some pen pals and they often write10 the pen pals. They also have many Chinese friends at school and they play games after class.

若$\left|3y-2x-5\right|+{\left(3x+4y-1\right)}^2=0$，则x的值等于(      )

找出句子中使用不当的词，并改正过来。

①烛光摇曳着，发出微小的光。____

②杰奎琳稳定地把烛台端了起来。____

③万一蜡烛自动熄灭，蜡烛的秘密就会揭露，秘密情报站就会遭到损坏。____

④伯诺德夫人慌忙从厨房中取出一盏油灯放在桌子上。____

现存世上最大型的鸟和最小型的鸟分别是（　　）