题目

新交的英国笔友想跟你学习汉语。你想告诉他汉语不好学时你应说：( )A.Chinese is very easy.B.My Chinese isn’t very good.C.Chinese isn’t easy to learn. 答案：【答案】C【解析】略已知函数y=-x2+x+2，则当y＜0时，自变量x的取值范围是（ ）A．x＜-1或x＞2B．-1＜x＜2C．x＜-2或x＞1D．-2＜x＜1