题目

在、、、、中，最简二次根式的个数是（）A. 1 B. 2 C. 3 D. 4 答案：【答案】A【解析】根据最简二次根式的定义，最简二次根式必须满足两个条件：（1）被开方数不含分母；（2）被开方数不含能开得尽方的因数或因式．被开方数是多项式时，还需将被开方数进行因式分解，然后再观察判断．∵、−、−、、，∴最简二次根式只有−一个．故选A．—I want to go to Chengdu this winter holiday. It is said that people there live a very comfortable life.—Tell me about it. Chengdu is a city you don't want to leave.A.whichB.whereC.what