已知函数$f\left(x\right)=\left\{\begin{array}{c}{2}^x,x\le 1\\ {\log }_{\frac{1}{2}}x,x>1\end{array}\right.$，则$f\left(f\right(2\left)\right)$等于(     )

下列物质中，属于有机合成材料的是（  ）

    My name is John Brown. I am a school boy. My school is 1my home. Every day it takes me a lot of time 2 there. The road is not good, so I can't 3my bike to school. I often take a bus there. It usually 4 me forty minutes to get there 5.I 6 at seven every morning. I have no time for breakfast at home. I often have something for breakfast on the bus 7 at school. I don't want to  8school. Some students in our school take buses to school. Some students walk to school 9 their homes are not far.10students ride bikes

已知：RCOO $\stackrel{SOC{l}_2}{\to }$ RCOCl（酰氯，化学性质十分活泼）；

RCOCl+NH₃→RCONH₂+HCl

根据以上信息回答下列问题：