集合$A=\left\{x|\left|x+1\right|\le 2\right\},B=\left\{y|y=x-1,-1\le x\le 1\right\}$，则$A\cap \left(C_{R}B\right)=$（ ）

2010年哈佛大学教授丽莎·蓝道尔在相对论的基础上提出第五度空间，引发学界关注。相对论提出一百多年来影响深远，其历史意义有(　　)
①是物理学思想的一次重大革命　②否定了经典力学的绝对时空论　③深刻地揭示了时间和空间的本质属性　④树立了新的空观、运动观、物质观

    Will you be happy when you leave your mother? Or will you miss your mother? If you do, you are homesick. “homesick” is a word made up of HOME and SICK. You know each word, right? But do you know the meaning when you put them together? It is Sick For Home. It means you miss your home. You miss the delicious food at home.

    Now think for a minute about SEASICK. Is Seasick the same as Homesick? Does seasick mean Sick For Sea? It means something quite different. “Seasick” means Sick By The Movement On The Sea. If you travel by ship and you feel seasick, you just want to go back home and have a good rest. Why? Because you feel sick on a ship.

    Have you ever heard of a person being heartsick? If you're heartsick, you are sad and your heart is broken. And we also have other words made like this, such as “handshake” and “handbag”. Isn't it interesting? It is also helpful to know something like this in your English study.