题目内容：

“Don’t be afraid to give your best to what seemingly are small jobs. Every time you conquer one it makes you much stronger. If you do little jobs well, the big ones will tend to take care of themselves,” said Dale Carnegie.

Sometimes, doing your best work or trying your hardest at something is difficult. It may have something to do with trying to do something new for the first time, like a new sport or activity at school. It may have something to do with doing homework for a subject that is not your favorite or is not your best.

As Hunter S. Thompson once said, “Anything worth doing is worth doing right.” And as Albert Einstein added, “We have to do the best we can. This is our sacred human responsibility.”

Developing the habit of trying your hardest and doing your best is something that will help you succeed throughout your life. If you have looked at some quotes related to trying your hardest, you will see that many of them come from people who have made a big difference in the world. This is not a coincidence. It was not only their cleverness that helped them stand out and change the world, but their ability to try their hardest and do their best in whatever they were doing. If you can develop this same habit---to do your best in any situation, it will be a great benefit to your family, career, school and community.

As Bob Cousy put it, “Do your best when no one is looking. If you do that, then you can be successful at anything you put your mind to.” The choice is yours.

1.Why does the author use the quote of Dale Carnegie in Paragraph 1?

A. To describe a scene.    B. To introduce a topic.

C. To draw a conclusion.    D. To support an argument.

2.According to the passage, in which case is it difficult to try your hardest?

A. When you are doing something that you are familiar with.

B. When you are doing something that you are good at.

C. When you are doing something that you feel bored with.

D. When you are doing something that you like very much.

3.Why does the author suggest we develop the habit of trying our hardest?

A. To let us make a big difference in the world.

B. To help us achieve success all through our life.

C. To make us more skillful in our work.

D. To make it possible for us to benefit the whole world.

4.What is the main purpose of the passage?

A. To inform.    B. To advertise.

C. To introduce.    D. To persuade.