问题 填空题

在数据库系统的三级模式体系结构中,描述数据在数据库中的物理结构或存储方式的是【 】。

答案

参考答案:内模式(或存储模式)

解析:内模式也称存储模式或数据库模式,它是数据物理结构和存储结构的描述,是数据在数据库内部的表示方式。

阅读理解

Cao Min couldn’t believe she was experiencing exactly what she had seen years ago in the film “Titanic”.

Cao and her two children from Anhui Province were traveling on board the “Liaoludu 7” on February 22. They were among the first people on the ship who were rescued by lifeboats. Cao’s one-year-old son was the youngest passenger on board.

The “Liaoludu 7” was traveling in the Bohai Straits from Lvshun in Liaoning Province to the port city of Longkou in Shandong Province. It suddenly lost its power at 2:30 pm and tilted(倾斜) on its side. With 81 people on board, the ferry began to sink.

“I was so scared that my legs couldn’t move forward. They kept shaking even when I was asked to jump onto a lifeboat,” Cao recalled.

Upon receiving the mayday appeal (紧急呼救), China Marine Search and Rescue Centre immediately informed the State Council. The center sent eight lifeboats to the fishing boats.

After more than four hours of fighting strong winds and freezing ocean water, the passengers were recovered. All but four survived. These four died after spending too long time in the freezing waters, according to a spokesperson for the Beijing-based center.

小题1:According to the passage, which of the following is TRUE?

A.The film “Titanic” had been on show again in Shanghai.

B.Cao Min and her children experienced the terrible accident.

C.“Liaoludu 7” with all passengers on board were saved.

D.The ferry began to sink on the way to the port of Liaoning.小题2:From the passage we can infer that                  .

A.China Marine Search and Rescue Centre quickly carried out the rescue task

B.the center sent eight lifeboats and asked for help from the United Nations

C.the passengers were fighting strong winds and freezing ocean water for one hour

D.the ferry sank into the sea immediately it tilted on its side at 2:30 pm小题3:According to the passage, ________ passengers on board were still alive.

A.four

B.seventy-seven

C.eight

D.eighty-one

填空题