下列关于数据库系统的叙述中，不正确的是( )。A．个人计算机系统上的单用户数据库系

发布时间：2018-01-13 07:23 │ 来源：www.tikuol.com

题型：单项选择题

问题：

下列关于数据库系统的叙述中，不正确的是( )。

A．个人计算机系统上的单用户数据库系统一般不支持并发控制

B．第二代数据库系统指支持关系模型的关系数据库系统

C．支持丰富的对象结构和规则是第三代数据库系统的一条准则

D．分布式系统与非分布式系统的用户操作是完全不同的

考点：计算机等级考试数据库技术三级数据库技术笔试

题型：单项选择题

阅读理解。

     Open today's newspaper. What do you see? Ads! Look through a magazine. More ads! Turn on the
TV. Still more ads! Everywhere you look, someone has something to sell. Here are some ways get us to
buy.
    Some ads use famous people. Stars are paid to sell a product. Think about it. Do they really know
about medicine? Do they know about soft drink? These people may be famous. But they may not know
about what they are selling.
     Some ads make you think you're getting the words of an expert (专家). A man in a white coat comes
on TV. He looks nice. "I use White and Black," he says. This man looks like a doctor. But he is an actor.
He has been paid to sell this product.
      Does soap (肥皂) have anything to do with a pretty child? Not much. But ads may show their products
with something nice, such as the sun, the flowers and so on. Such an ad is about feelings rather than facts.
      Ads are full of strong words. Words like"new" and"improved" have power (力量). They can help a
product sell. The soap may be called "Spring Rain". A car may be called "Tiger". Strong words work on
our feelings.
      Some ads make promises (承诺). But can they keep them? No.
      Some ads use our fear of being too late. "Buy now!" they say, "Selling ends soon." Check to see if this
is true. Don't hurry. Take time to think.
      All ads hope we will buy some thing, do something, or think in a certain way. Know what ads are doing.
Ask questions to yourself. Don't let their words and pictures fool you.

1. We can see ads ______.

[ ]

A. on TV
B. in magazines
C. in newspapers
D. all the above

2. Some stars appear in the ads because ______.

[ ]

A. they know every product well
B. they are famous
C. they are all experts
D. they all like white coats

3. According to the passage, we know that "Spring Rain" is the name of ______.

[ ]

A. a kind of soap
B. a kind of car
C. a kind of medicine
D. a kind of flower

4. The writer thinks the words and pictures in the ads ______.

[ ]

A. tell us a story
B. always make us strong
C. sometimes fool us
D. keep promises

5. What can we learn from the passage?

[ ]

A. We should always believe the ads.
B. We should not always believe the ads.
C. We should think about the ads after we buy something.
D. We can believe all the stars.

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