题目

用配方法解方程时，下列配方结果正确的是（ ）A. B. C. D. 答案：【答案】B【解析】本题实际上是把左边配成完全平方式，右边化为常数．移项，得：x2+2x=5配方，得：x2+2x+1=5+1，即（x+1）2=6．故选B．When we plan our vacation, mother often offers _____ suggestions. [     ]A. carefulB. practicalC. effective D. acceptable