问题 单项选择题

下列有关数据库的描述,正确的是

A.数据处理是将信息转化为数据的过程

B.数据的物理独立性是指当数据的逻辑结构改变时,数据的存储结构不变

C.关系中的每一列称为元组,一个元组就是一个字段

D.如果一个关系中的属性或属性组并非该关系的关键字,但它是另一个关系的关键字,则称其为本关系的外关键字

答案

参考答案:D

解析:解析:数据处理是指将数据转换成信息的过程,故选项A)叙述错误;数据的物
理独立性是指数据的物理结构的改变,不会影响数据库的逻辑结构,故选项B)叙述错误;关系
中的行称为元组,对应存储文件中的记录,关系中的列称为属性,对应存储文件中的字段,故
选项C)叙述错误。

多项选择题
完形填空

    Directions: Reading the following passage. Answer the questions accroding to the information given in the passage and the required words limit.

Xu Hui is very excited. The Senior 1 student in a middle school in Beijing will go to Japan with his parents during the Spring Festival.

“Overseas touring has always been a dream for me,” he said happily.

Nowadays, Chinese people enjoy longer holidays, such as the three “Golden Week Holidays”(the Spring Festival, May Day and National Day). They have more time to travel. Rising incomes also make travelling abroad realistic for ordinary Chinese people.

Nearly 7 million Chinese travelled overseas in 2001, according to the National Tourism Administration(国家旅游局). The most common problem travellers face is how to choose the best routes.

By the end of 2002, Chinese citizens were allowed to travel to 19 foreign countries and regions at their own expense.

The top 10 places included Hong Kong, Macao and Thailand. European countries are also becoming increasingly popular.

“More and more Chinese people have shown interest in travelling to Europe, particularly France and Finland,” said Tan Wen, a general manager of China Youth Travel Service. “Sooner or later, there will be a peak in European tours.”

Another consideration is choosing the right travel agencies and finding the best price. The China Consumers’ Association offered tips to consumers on choosing the right travel agencies to help prevent a relaxing vacation from turning into a costly disaster.

“Price should not be the single most important factor in choosing a travel agency,” said Zhang Yuanchao, CCA vice-secretary general. Consumers are advised to choose large State travel agencies with good reputations and official approval to organize overseas tour groups.

Zhang’s association dealt with more than 5, 000 complaints about travel agencies last year. And the majority of the complaints were about random changes in travel routes, bad tour guides, and forced shopping.

Travellers were warned to look carefully at their contracts with agencies and to buy travel insurance.

81. How many reasons are given in the article as to why ordinary Chinese people are traveling abroad more today? ( No more than 2 words )

82. List two factors Chinese travellers should consider while choosing a travel agency.

( No more than 3 words )

83. What seems to be the most common result of choosing a bad travel agency ?

( No more than 12 words )

84. What would be a good title for this passage ? ( No more than 6 words)