圆弧插补段程序中，若采用圆弧半径R编程时，从始点到终点存在两条圆弧线段，当()时，用

CNNIC于2008年7月发布的《第22次中国互联网络发展状况统计报告》显示，我国网民数达2.53亿，超美国居世界首位。尽管如此，我国互联网普及率只有19.1%，仍然低于21.1%的全球平均水平。与上年同期相比，我国网民人数增加了9100万，是历年来增长最快的一年，同比增长56.2%。仅2008年上半年，我国网民数净增量就达4300万。统计表明，我国网站数量持续增长，截至2008年7月共有网站191.9万个，同比增长率为46.39%；其中CN域名下的网站数为136.9万个。

2008年上半年的新增网民中，30岁以上者所占的比重约为（）。

A.28%

B.30%

C.33%

D.35%

Since 1989, Dave Thomas, who died at age 69, was one of the most recognizable faces on TV. He appeared in more than 800 commercials (商业广告) for the hamburger chain named for his daughter. “As long as it works," he said in 1991, “I'll continue to do those commercials."

Even though he was successful, Thomas remained troubled by his childhood. “He still won't let anyone see his feet, which are out of shape because he never had

properfitting shoes," Wendy said in 1993. Born to a single mother, he was adopted(收养) as a baby by Rex and Auleva Thomas of Kalamazoo in Michigan. After Auleva died when he was 5, Thomas spent years on the road as Rex traveled around seeking construction work. “He fed me," Thomas said, “and if I got out of line, he'd beat me."

Moving out on his own at 15, Thomas worked, first as a waiter, in many restauran

ts. But he had something much better in mind. “I thought if I owned a restaurant," he said, “I could eat for free." A 1956 meeting with Harland Sanders led Thomas to a career as the manager of a Kentucky Fried Chicken restaurant that made him a millionaire in 1968.

In 1969, after breaking with Sanders, Thomas started the first Wendy's Old Fashi

oned Hamburgers, in Columbus, Ohio, which set itself apart by serving made to order burgers. With 6,000 restaurants worldwide, the chain now makes$ 6 billion a year in sales.

Although troubled by his own experience with adoption, Thomas, married since 1954 to Lorraine, 66, and with four grown kids besides Wendy, felt it could offer afuture for other children. He started the Dave Thomas Foundation (基金会) for Adoption in 1992.

In 1993, Thomas, who had left school at 15, graduated from Coconut Creek High School in Florida. He even took Lorraine to the graduation dance party. The kids voted him Most Likely to Succeed.

“The Dave you saw on TV was the real Dave,"says friend Pat Williams. “He wasn't a great actor or a great speaker. He was just Joe Everybody."

1.What is the article mainly about?

A. The life of Dave Thomas.              B. The dream of Dave Thomas.

C. The schooling of Dave Thomas.          D. The growth of Dave Thomas's business.

2. What do we know about his childhood?

A.He lived a poor life.                  B.He had caring parents.

C.  He stayed in one place.              D.  He didn't go to school.

3.Choose the right time order of the following events in Thomas's life.

a.graduated from high school         b.started his own business

c.became a millionaire               d.started a foundation

e.met Harland Sanders

A. e，b，c，d，a，    B. a，e，c，b，d，      C. e，c，b，d，a，    D. a，e，b，c， 

4. “He was just Joe Everybody." (in the last paragraph) means  _______.

A. Dave was famous               B. Dave was ordinary

C. Dave was showy                D. Dave was shy 

5.What is the name of Dave Thomas's business?

A. Thomas's.         B. Wendy's.         C. Lorraine's.         D. Rex's. 

若D1=A1，A2，A3，D2=B1，B2，B32则D1×D2集合中元组共有几个

A．6

B．8

C．9

D．12

首创于四川地区的( )，是我国使用纸币的开始，也是世界上最早的纸币。

A．交钞

B．交子

C．会子

D．飞钱

依据我国《合同法》的规定，以下可以引起合同变更的是( )。

A．一方以欺诈、胁迫的手段订立合同

B．因重大误解而订立的合同

C．一方要求变更合同

D．损害社会公共利益的合同