问题 选择题

2012年我国国内生产总值为435 000亿元,结果用科学记数法表示435 000结果为( ▲)

A.4.35×103

B.4.35×104

C.4.35×10 5

D.4.35×106

答案

答案:C

科学记数法的表示形式为a×10n的形式,其中1≤|a|<10,n为整数.确定n的值时,要看把原数变成a时,小数点移动了多少位,n的绝对值与小数点移动的位数相同.当原数绝对值大于1时,n是正数;当原数的绝对值小于1时,n是负数.435 000=4.35×10 5,故选C.

阅读理解

Do you love American country music? If you do, come to Nashville. It’s the home of American country music.

Nashville is the capital city of the state of Tennessee. Here you don’t have to go to the big auditoriums(音乐厅) to enjoy the country music. In the open air restaurants or on the streets, you can always hear the beautiful and sweet sounding folk music. All the singers are young and they play their guitars while they sing. The songs they sing are so touching(动人) that, if you listen attentively, you can feel they are singing with their souls rather than with their voices.

Shops selling music records and tapes can be found everywhere in Nashville. Many records are made by famous singers and they are sent to many countries all over the world.

The folk songs most of the singers sing come form the rural areas in the southern United States. The songs often describe those days to situations and the feeling of the country people. They often sing in praises of heroism(英雄) and true love.

1. From the passage we know Nashville is ________.

A. a village       B. a big city   C. a small town        D. a capital city

2. To enjoy the country music, you can go to ________.

A. the big auditoriums   B. the open air restaurants    C. the streets  D. All of the above

3. According to the passage which of the following statements is not true?

A. Shops that sell music records and tapes can be found everywhere in Nashville.

B. The folk songs can impress you deeply

C. Not all records are made by famous singers

D. The folk songs only sing in praises of heroism and true love.

4. The passage is mainly about ________.

A. Nashville  B. American young people   C. pop singers   D. the country music

单项选择题