关于x的方程ax+b=0，当a，b满足条件______时，方程的解集是有限集；满

阅读短文，根据短文内容选择所给问题的答案。

Dear friends,

My name is Tony. I am English. I am twelve years old this year. I am tall, and I am good at playing football. I am in Grade Seven. There are thirty boys and twenty girls in my class. We are learning Chinese in our school. Our Chinese teacher is Mr. Wu. He is a little short, but he is very strong. He is very nice to us. I have some good friends in my class. Tom is a tall boy and has short black hair. He is good at playing football, too. Alice is short and she loves wearing red dresses. She is good at English. Shelly has long hair. She can speak Japanese and she likes swimming. We all study hard.

What about your school and your friend?  Please write soon.

Yours,

Tony

小题1:Which country is Tony from?

A．America.

B．England.

C．China.

D．Japan.小题2:Who is Mr. Wu?  

A．He is Tony’s English teacher.

B．He is Tony’s father.

C．He is Tony’s friend.

D．He is Tony’s Chinese teacher.小题3:How many students are there in Tony’s class?

A．50.

B．30.

C．20.

D．52.小题4:Who likes swimming?

A．Tom.

B．Alice

C．Shelly.

D．Mr. Wu.小题5:Who writes this letter?

A．Tony

B．Tom.

C．Shelly.

D．We don’t know.

如图：花的基本结构图，请填写指示线所指部分的名称．

①______；②______；③______；④______；⑤______；⑥______．

保护好青少年的视力是当前学校及家长十分现实的问题。那么，怎样健康用眼，预防近视的发生和发展呢？

1997年3月，甲资产评估事务所接受乙公司委托，并根据乙公司要求对甲资产评估事务所的前身某市财务资产评估服务所1992年11月30日出具的资产评估报告书（文号为：评估甲[92]字第101号）作出修改，补入部分土地价值，致使该资产评估报告书中的总资产增加。对上述改动，甲资产评估事务所未向证券监管部门和投资者作出说明，仍以原资产评估报告书的文号和时间向证券监管部门报送已修改过的资产评估报告书。

甲资产评估事务所的行为属于什么性质的行为？

流变形变类型可分为最基本的三类：（）、（）以及简单剪切和简单剪切流。