问题 单项选择题

MIPS是衡量CPU处理速度的一种常用指标,它的含义是:( )。

A.每秒钟平均可执行的单字长定点指令的数目

B.每秒钟平均可执行指令的数目

C.每秒钟平均可执行的浮点指令的数目

D.每秒钟平均可执行的算术运算指令的数目

答案

参考答案:A

解析:CPU的处理速度也是PC机的主要性能参数之一。CPU速度是指计算机每秒钟所能执行的指令条数。由于不同类型的指令所需的执行时间不同,因而运算速度的计算就有不同的方法。其中的一种计算方法就是以单字长定点指令的平均执行时间来计算,单位就是MIPS。

阅读理解

With the increasing numbers of smart phones and Chinese Internet users, micro blogging, known as Weibo in Chinese, has become more and more popular. Popular websites have created their own Weibo sites, which allow users to post a message of up to 140 words, along with pictures and videos(视频).

In August 2009 the largest website in China —— “sina.com” firstly set up sina Weibo”, helping micro blogging enter the mainstream in China. In 2010, Internet giants sohu, yahoo, baidu also sent up their own Weibo sites. By the end of October 2010, only sina’s Weibo site had registered(登记)more than 50 million users, with an average of 40 people opening a Weibo site every second. Weibo allows people to post messages quickly using their mobile phones, to stay in touch with friends, and provides channels for different people to communicate.

As the social influence of Weibo continues to grow, more and more news agencies(通讯社)and government departments are beginning to send information through Weibo sites. Wang Peng, a Weibo blogger, said, “Through Weibo it allows me to send my advice to director of my news agencies. Also, I can keep in touch with friends. There are many middle school and university classmates on my blog”. With sending more information to people, the influence of micro blogging in China is increasing.

小题1:From this passage, we know that “Weibo” is a ______ way of communicating.

A. boring                       B. popular                  C. difficult

小题2:You can send ­­­_______ to your friends by using micro blogging.

A. long messages               

B. mobile phones               

C. nice pictures

小题3:According to the passage, ________ was the first one to open a Weibo site.

A. sina.com                 B. sohu.com                 C. baidu.com

小题4:From Wang Peng’s words, we can guess that he is most probably a(n) ______.

A. engineer                 B. student                      C. reporter

小题5:The best title of this passage is “______”.

A. Micro blogging was first used in China

B. Micro blogging in China takes off

C. Weibo changes Chinese Internet users

多项选择题 案例分析题