问题 单项选择题

下列叙述中,正确的选项是( )。

A.数据库设计是指设计数据库管理系统

B.数据库技术的根本目标是要解决数据共享的问题

C.数据库是一个独立的系统,不需要操作系统的支持

D.数据库系统中,数据的物理结构必须与逻辑结构一致

答案

参考答案:B

解析: 计数据库的目的实质上是设计出满足实际应用需求的实际关系模型。数据库技术的主要目的是有效地管理和存取大量的数据资源,包括:提高数据的共享性,使多个用户能够同时访问数据库中的数据;减小数据的冗余,以提高数据的一致性和完整性;提供数据与应用程序的独立性,从而减少应用程序的开发和维护代价。

阅读理解

阅读理解。

                                                          The Guitar Player

      One day Tony was crossing the road when he was hit by a car. He fell and broke his arm.

      An ambulance soon arrived and took Tony to a hospital. There a doctor operated on his arm. Then he

put the arm in a cast (石膏). Tony could not move it at all.

      "You must keep your arm in a cast for six weeks," the doctor said. "That will give the broken bone a

chance to heal (愈合)."

      At the end of six weeks Tony went back to the hospital. The doctor cut the cast with a large saw (锯).

Then he took Tony's arm out of the cast.

      "Can you move your arm, Tony?" he asked.

      Tony tried to move his arm. At first it was difficult, but soon he was able to move it a little.

      "Yes, it's fine," he said. "Thank you very much."

      "In a few days it will be as good as new, "the doctor said. Just exercise it a little,"

      "Will I be able to play the guitar?" Tony asked.

      The doctor smiled. "Of course you will," he said. "You'll have no problem."

      "That is good news," Tony said. "Because I couldn't play it at all before."

1. How long did he have to keep his arm in the cast? [ ]

A. About 40 days.

B. A few days.

C. Two weeks.

D. Two months.

2. What did the doctor tell Tony to do after the cast was taken off?[ ]

A. Keep his arm still.

B. Exercise his arm.

C. Play the guitar.

D. Operate on his arm.

3. Why was Tony pleased? [ ]

A. He could play the guitar before he broke his arm.

B. The doctor taught him how to play the guitar.

C. He thought he would now be able to play the guitar.

D. The doctor said he would never play the guitar again.

4. Which statement is NOT true?[ ]

A. It took the broken bone six weeks to heal.

B. The cast was so hard that the doctor had to cut it open with a special tool.

C. Tony liked playing the guitar but he didn't know how to play it.

D. A traffic accident happened to Tony on his way to school.