问题 单项选择题

方程(x+1)(y2+1)dx+y2x2dy=0是______.

A.齐次方程

B.可分离变量方程

C.伯努利方程

D.线性非齐次方程

答案

参考答案:B

解析:[考点提示] 方程类型的判断.
[解题分析] 方程(x+1)(y2+1)dx+y2x2dy=0可化为[*],故该方程为可分离变量方程.即正确答案为B.

选择题
阅读理解

I have a friend named Monty Roberts who owns a horse ranch (大牧场) in San Isidro. He lets me use his house to hold events to raise money for youth at risk programs.

The last time I was there he greeted me by saying, “I want to tell you why I let you use my house. It all goes back to a story about a young man who was the son of a poor horse trainer who would go from stable (马厩) to stable, farm to farm, training horses. As a result, the boy’s high school was continually interrupted (打断). One day in the last year of high school, he was asked to write a paper about what he wanted to do when he grew up.

“He wrote a seven-page paper about his goal of owning a horse ranch in great detail. He put a great deal of his heart into the project and even drew a detailed floor plan for the dream ranch. Then the next day he handed it in to his teacher. Two days later he received his paper back. But he got a low mark with a note that read, ‘See me after class.’

“The boy went to see the teacher after class and asked, ‘Why did I receive a low mark?’

“The teacher said, ‘This is an unrealistic dream for a young boy like you. You have no money. You come from a poor family. Owning a horse ranch requires a lot of money. There’s no way you could ever do it, your dream couldn’t come true . ’Then the teacher added, ‘If you will rewrite this paper, I will reconsider your mark.’

“The boy went home and thought about it long and hard. He asked his father what he should do. His father said, ‘Look, son, you have to make up your own mind on this. However, I think it is a very important decision for you.’

“Finally, the boy turned in the same paper, making no changes at all. He wrote, ‘You can keep the low mark and I’ll keep my dream.’

“I was that boy twenty years ago.” My friend said, smiling.

小题1:Which of the following statements is TRUE about Monty Roberts?

A.He was born in a poor family.

B.He received a good education.

C.He is raising money for the poor.

D.He is a horse trainer who works from farm to farm.小题2:From Paragraph 3, we know Monty Roberts _____.

A.was just a daydreamer

B.decided to follow his father’s example

C.expected the teacher to praise him

D.had a great plan for his future小题3:The teacher thought Monty Roberts’s dream was _____.

A.strange

B.great

C.pleasant

D.impossible小题4: From the end of the text, we can infer that Monty Roberts was very _____.

A.careful

B.clever

C.determined

D.active小题5: The purpose of the text is to tell readers that _____.

A.seeing is believing

B.knowledge is power

C.all roads lead to Rome

D.where there is a will, there is a way