21．Armstrong was called Pops because he ______.

A．looked like a musician B．traveled to play modern music

C．showed an interest in music D．was a musician of much influence

22.The third paragraph is developed ______

A．by time B．by order C．by space D．by comparison

23．Which statement about Armstrong is true?

A．His tale begins in New Orleans.

B．He was born before jazz was invented.

C．His music was popular with his listeners．

D．He learned popular music at a boy's home.

24．Which would be the best title for the text?

A．The Invention of the Jazz Music． B．The Father of the Jazz Style.

C．The Making of a Musician． D．The Spread of Popular Music.

　In order to earn both money and social experience recently , I became a door-to-door salesman.

　I once read a saying: "If somebody wants something of yours, you will be treated as warmly as spring, but if they don't, you may be treated as coldly as winter. " You may consider this an exaggeration (夸张), but if you are a salesman, it is clearly correct.

You would never have found it to be so true if you hadn't been a salesman. You needn't stand doubtful looks and unfriendly comments; you needn't listen to something completely wrong and nod to say that it was quite right; you needn't worry about being refused time after time; you needn't always keep patience and a smile; you needn't repeat the same sentences over and over again; you needn't talk to somebody you dislike...

I did this work for a month, then I decided to give it up. Apart from the reasons above, I found I was paying too much attention to the job and thus sacrificing my