小林同学做“探究凸透镜成像规律”的实验中，蜡烛、凸透镜、光屏在光具座上的位置如图所示，这时烛焰在光屏上成清晰的像（像未在图中画出来），下列说法正确的是（   ）

为了除去苯中混有的少量苯酚，下列的实验方法正确的是

已知R上的连续函数g(x)满足：①当x>0时，g'(x)>0恒成立(g'(x)为函数g(x)的导函数)；②对任意的x∈R都有g(x)=g(-x)，又函数f(x)满足：对任意的x∈R，都有$f\left(x+\sqrt{3}\right)=f\left(x-\sqrt{3}\right)$成立。当$x\in -\sqrt{3},\sqrt{3}$时，$f\left(x\right)=x^3-3x$。若关于x的不等式$gf\left(x\right)\le g\left(a^2-a+2\right)$对$x\in -\frac{3}{2}-2\sqrt{3},\frac{3}{2}+2\sqrt{3}$恒成立,则a的取值范围是（   ）

根据短文内容和所给中文提示，写出空白处各单词的正确形式。每空限填一词。

    Jenny is an English girl. She is ____ (九) years old. Today is ____ (三月) 16th. It's her birthday. She wants to have a birthday ____（晚会）. It is ____ (在) seven this evening. But her uncle and aunt are____ (迟到的).She ____ (见面) five of her friends. They buy her a big birthday cake，two boxes of____ (牛奶), a basket of fruit, and ____ (一些) school things. Jenny wears a____ ( 绿色) sweater and brown trousers. She looks very nice. They all ____ (度过) a good time.