问题 填空题

武汉长江二桥是世界上第一座弧线形钢塔斜拉桥,该桥全长16800m,用科学记数法表示这个数为________.

答案

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>1时,n是正数;当原数的绝对值<1时,n是负数.

解:将16 800用科学记数法表示为1.68×104

考查科学记数法的表示方法.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,表示时关键要正确确定a的值以及n的值.

阅读理解

When he was 16, his father seriously said to him, “I’ll give you whatever you want before you are 18. But after that, I won’t care much about you, and you should give me whatever I want.” When his 18th birthday was coming, the young man began thinking about looking for a job. So he sent resumes(简历) to many companies he liked on the Internet. But, most got no reply, he said, “Maybe they were surprised about my primary school education.”

By chance, one of his friends was looking for someone, who could work as an egg porter(搬运工) in the supermarket, for 0.5 Yuan a box. Facing lots of difficulties in getting a job, he said, “I’ll take this job. At least I can make some money for my petrol(汽油).” Then every day, he drove his car, his 18th birthday gift, to work in the supermarket. He did that for three months.

Later, he heard that a newspaper was looking for a network technician(网络技术员), so he asked for it. But they were also worried about his school education. He practiced his skill right in front of the computer, and showed the managers web pages he had designed. He started to work the next day, and became the director of network department in less than a year.

And now, the 23-year-old man is a boss. In January 2005, he started a magazine for children, with himself as the editor in chief(主编). And the only writer was his father.

小题1:It was difficult for the young man to get a job because _______.

A.he was only 18 years old

B.his father cared too much about him.

C.he had an expensive car

D.he didn’t have enough school education小题2:What did the 18th birthday mean to the young man?

A.He could get a car as a gift.

B.He had to make a living all by himself.

C.He had to leave his parents.

D.He had to work in a supermarket.小题3:The young man’s father might be_______.

A.a well-know and rich writer

B.a computer programmer

C.a very old and kind man

D.a manager of a big company小题4:The magazine the young man started was perhaps______.

A.about network technicians

B.about working for newspapers

C.made of many funny stories

D.sold only in supermarkets

单项选择题