题目

?Why not buy a radio and learn English on the radio? ?_____A.Sounds like a good idea!B.It doesn't matter.C.Thanks for your help.D.Sorry to hear that. 答案:【答案】A【解析】句意:?为什么不买一个收音机,通过收音机学习英语呢??听起来是一个好主意。A. Sounds like a good idea!”听起来是一个好主意“; B. It doesn't matter.”没关系“;C. Thanks for your help.”谢谢你的帮助“;D. Sorry to hear that.”听到这个很难过“。根据题意,故选A。15.如图,已知一次函数y1=-x+m与二次函数y2=ax2+bx-3的图象相交于点A(-1,0)、B(2,-3),且二次函数与y轴相交于点C.(1)求点m的值和二次函数的解析式;(2)求二次函数的顶点坐标和对称轴;(3)请直接写出当y1<y2时,自变量的取值范围.
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