设$f\left(x\right)=e^x-2$，则函数$f\left(x\right)$的零点位于区间 （    ）

某个生态系统中的生物有：草、虫、鸟和鹰，其中食物链的表示正确的是（　　）

    It was Sunday yesterday. The weather was fine. It was sunny and there were no clouds in the sky. Sandy and Sue got up early in the morning. Now they were in the park. It is a big park and it's so beautiful. They saw many people there. Some boys played football on the grass. Some girls danced under the tree. An old man walked beside the lake. A young woman and her little son looked at the fish in the lake. How happy they are!

如图所示，一束白光经三棱镜后发生了光的色散现象，最早发现这一现象的物理学家是____ ，从图中可以看出红色光线的偏折程度最____ ，在各种不同色光中，红、____ 、蓝叫做三原色光．