已知抛物线y=ax²+bx+c的开口向下，顶点坐标为（2，﹣3），那么该抛物线有（   ）

根据句意及首字母或汉语提示完成单词

根据短文理解，完成各题任务。
C
    Sally is an English girl. She is my English teacher, Mrs. Brown's daughter. She is only five years old. (A)She can't go to school. She likes playing ping-pong.
    Her favorite ping-pong player is Zhang Yining. Sally is in the ping-pong club. She goes to the ping-pong club every day. She plays ping-pong for two hours there.
    Sally has a sister. Her name is Maria. She is in our class. She likes running. She runs with her mother every morning. (B)她最喜欢的赛跑明星是刘翔. Maria says she wants to be a running star like Liu Xiang.

选择合适的句子完成对话，有两项多余。

A. Is the man your father?               B. No, I don't. C. What are you going to be one day?      D. What does he do? E. Who's the man?                     F. Where does he work? G. Does your father work in a car factory?

A:Hello. ____ 

B:Yes, he is my father.

A:____ 

B:He is an engineer.

A:____ 

B:He works in a car company.  He likesdrawing pictures.

A:Do you like drawing pictures?

B:____ I like singing.

A:____  

B:I'm going to be a singer one day.

下列各句中，加横线成语使用不恰当的一项是（    ）