在计数抽捡方案的OC曲线中，OC曲线单调( )。当OC曲线一定，不合格品率减小时，

以下反应所鉴别的药物是：碱性酒石酸铜试液反应（）.

A．葡萄糖 

B．磺胺嘧啶 

C．硫酸阿托品 

D．奥沙西泮 

E．丙磺舒

某电视机专卖店出售一种新面市的电视机，平均每天售出50台，每台盈利400元．为了扩大销售，增加利润，专卖店决定采取适当降价的措施．经调查发现，如果每台电视机每降价10元，平均每天可多售出5台．专卖店降价第一天，获利30000元．问：每台电视机降价多少元？

人造地球卫星在离地面的高度等于地球半径R 的轨道上运动，已知地面的重力加速度为g ，则卫星做匀速圆周运动的线速度v 等于[ ]

A．

B．

C．

D．

阅读理解。

    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 proper fitting shoes," Wendy said

in 1993. Born to a single mother, he was adopted 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 restaurants. 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 Fashioned 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 a future for other children. He started

the Dave Thomas Foundation 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 schoolb. 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,d,

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.

国 * * 障自然资源的（），保护珍贵的动物和植物。

A.绝对保护

B.合理利用

C.最大利用

D.有限使用