已知全集U=R,集合$A=\left\{x|lgx\le 0\right\}$,$B=\left\{x|2^x\le 1\right\}$则$C_U\left(A\cup B\right)=$(     )

    Hi, I am Susan. I am from the U. K. But now I'm studying(学习) in China. I'm going to do many things in the winter holiday. First, I'm going to finish my homework. Then I'm going to take a trip. I'm going to Beijing. It's snowy in Beijing. There is white snow everywhere. So I'm going to make a snowman. I can ski. My parents will come to China with me. We are going to fly there. We are going to have a nice trip.

根据短文内容判断正误。

下列关于核酸的叙述不正确的是（　　）