关于流媒体的描述中，正确的是( )。A．流媒体播放都没有启动

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问题单项选择题

关于流媒体的描述中，正确的是( )。

A．流媒体播放都没有启动延时

B．流媒体内容都是线性组织的

C．流媒体服务都采用客户/服务器模式

D．流媒体数据流都需要保持严格的时序关系

答案

参考答案：D

解析：流媒体是一种以音视频数据流的方式在网络上传递多媒体信息的技术。与传统的多媒体下载不同，流媒体数据流具有连续性、实时性、时序性，即其数据流具有严格的前后时序关系。

阅读理解

完形填空

根据对话内容，从对话后的选项中选出能填入空白处的最佳选项，选项中有两项多余选项。（共五小题；每小题5分，满分10分）

—How often do you use the Internet?

— 1 But I usually use it o check my email. I don’t often surf the Internet. You use the Internet a lot, don’t you?

— 2

—So, you’re working online eight hours a day. It can be awful when the connection is poor.

— 3 Sometimes I also help others in the office if they’re having trouble online.

—How useful do you think the Internet is as a source of information?

—I think it’s useful. 4 The information online may be false. You don’t see what you buy online until you actually get it.

— 5

—We usually find the website of shops, then visit the shop and buy when we’ve seen the products.

A．But there are two big problems.

B．Yes. I usually surf the Internet to look through the news.

C．Why do you want to buy something online?

D．Yes. I use it to find products at the lowest price for my company.E. Yes. I like the job though.

F. How do you solve the problems when shopping online?

G. I use it almost every day.