设函数y1(x)，y2(x)，y3(x)是二阶线性微分方程y"+a(x)y’+b(x

阅读理解。

     Most middle school students wear uniforms. Some students like uniforms, but others don't. However,

recently, a Japanese government survey (政府调查) shows that more students in Japan like uniforms

now because school uniforms are more fashionable (时尚的) than they were before.

     I surveyed some Japanese students about what they thought about school uniforms. I asked them,

"Do you like fashionable uniforms?" There were lots of different opinions (观点, 看法).

     Hiromi said, "I like school uniforms because I don't need to choose clothes every day. I think that

fashionable uniforms are good. My high school uniform is fashionable, but there is a problem. Fashionable uniforms are too expensive."

     Miki said that she didn't like fashionable uniforms because she didn't want to spend too much money

on uniforms. She thought that the uniforms should be changed(被改变). They should be cheaper and

easier to get.

     Mitsuaki said, "I don't like school uniforms because I want to look different. I also agree that

fashionable uniforms make many students want to wear uniforms in high school. If students like

fashionable uniforms, it is good. "

1. Do more students or fewer students like uniforms in Japan now?

    _____________________________________________________________________

2. What is the question of the survey?

    _____________________________________________________________________

3. How many students' opinions are there in the passage?

    _____________________________________________________________________

4. Why does Hiromi like school uniforms?

    _____________________________________________________________________

5. Why do students not like school uniforms?

    _____________________________________________________________________

读某地剖面等压线分布图，完成下列问题。

对图中ABCD四点气压高低的比较正确的是（）。

A．A＞D

B．B＞C

C．A＞B

D．C＞D

肺炎支原体的发病机理与直接毒性和免疫损伤有关。()

根据2005年修订的《中华人民共和国公司法》；股份有限公司注册资本的最低限额为（）

A.人民币十万元

B.人民币五百万元

C.人民币一千万元

D.人民币一亿元

以下哪些行为属于未履行承诺之服务？