函数y=ax²（a≠0）与直线y=2x-3的图象交于点（1，b）．

求：（1）a和b的值；

（2）求抛物线y=ax²的开口方向、对称轴、顶点坐标；

（3）作y=ax²的草图．

—Li Mei usually helps others,_____?

—Yes, she is kind-hearted.[ ]

A. does she    

B. is she

C. doesn't she