选择合适的句子补全对话。

     Mrs. Smith: Hi, Li Ming! 1._____ .  Did you have fun today?

     Jenny: 2._____.

     Mrs. Smith: 3._____.

     Jenny: This morning, we went to the store.

     Li Ming: This afternoon, we went to the gym.

     Jenny: 4._____ I taught Li Ming to throw and catch the ball.

     Mrs. Smith: 5._____.

     Li Ming:  He wanted to learn, but Danny thought the ball was too heavy.

A. Yes, we did.

B. Hi, Jenny!

C. How about Danny?

D. Where did you go?

E. We played basketball.

下列叙述中，哪一条是不正确的______。

A．一个二维表就是一个关系，二维表的名就是关系的名

B．关系中的列称为属性，属性的个数称为关系的元或度

C．关系中的行称为元组，对关系的描述称为关系模式

D．属性的取值范围称为值域，元组中的一个属性值称为分量