Question

7．Your DNS cache （域名存储器）stores the locations （IP addresses）of web servers that contain web pages which you have recently viewed．If the location of the web server changes before the entry in your DNS cache updates，you can no longer access the site．
If you encounter a large number of HTML 404 error codes，you may need to clear your DNS cache．After you clear your DNS cache，your computer will query （询问）nameservers （域名服务器）for the new DNS information．The following methods allow you to remove old and inaccurate DNS information that may result in 404 errors．
Windows 7
To clear your DNS cache if you use Windows 7，perform the following steps：
Click Start．
Enter cmd in the Start menu search text box．
Right-click Command Prompt and select Run as Administrator．
Run the following command：

Ipconfig/flushdns

If the command succeeds，the system returns the following message：Windows IP configuration successfully flushed the DNS Resolver Cache．
Windows?8
To clear your DNS cache if you use Windows 8，perform the following steps：
On your keyboard，press Win+X to open the WinX Menu．
Right-click Command Prompt and select Run as Administrator．
Run the following command：

Ipconfig/flushdns

If the command succeeds，the system returns the following message：Windows IP configuration successfully flushed the DNS Resolver Cache．
Windows XP，2000，or Vista?
To clear your DNS cache if you use Windows XP，2000，or Vista?，perform the following steps：
Click Start．
On the Start menu，click Run．
If you do not see the Run command in Vista，enter run in the Search bar．
Run the following command：

ipconfig/flushdns

If the command succeeds，the system returns the following message：Successfully flushed the DNS Resolver Cache．
MacOS?10.10.4 and above
To dear your DNS cache if you use MacOS X version 10.10.4 or above，perform the following steps：
Click Applications．
Click Utilities．
Click Terminal．
Run the following command：

sudo killall-HUP mDNSResponde

If the command succeeds，the system docs not return any output（输出信息）．Warning：
To run this command，you must know the computer's administrator account password．

25．If the command succeeds，all the following systems return a massage exceptB．
A．Windows?8                                
B．Windows 7
C．Windows XP，2000，or Vista?
D．MacOS?10.10.4 and above
26．What's the main purpose of writing the passage？B
A．To introduce something about several systems on computer．
B．To explain how to solve some problem in several systems on computer．
C．To explain how to access some sites in several computer systems．
D．To explain how to install DNS cache in several computer systems．
27．Which of the following is true about DNS cache，according to the text？A
A．DNS cache stores the IP addresses of web servers．
B．DNS cache needs to be cleared，if you meet a large number of error codes．
C．DNS information may result in 404 errors．
D．Unless the entry in your DNS cache updates，the location of the web server won't change．

Answer 1

分析 短文主要讲述了当浏览过的网页无法查看时，不同电脑系统的解决方案不同．

解答 25．B，细节理解题，根据If the command succeeds，the system returns the following message：Windows IP configuration successfully flushed the DNS Resolver Cache．Windows?8，If the command succeeds，the system returns the following message：Windows IP configuration successfully flushed the DNS Resolver Cache．Windows XP，2000，or Vista?和If the command succeeds，the system returns the following message：Successfully flushed the DNS Resolver Cache．MacOS?10.10.4 and above，可以得知，只有B选项没有提到．
26．B，主旨大意题，根据短文提到的是当DNS缓存过的页面无法查看时，不同系统的解决方法，故答案为B．
27．A，细节理解题，根据句子Your DNS cache （域名存储器）stores the locations （IP addresses）of web servers 可知，域名存储器储存着访问过的网页地址，故答案为A．

点评 解答任务型阅读理解题，首先对原文材料迅速浏览，掌握全文的主旨大意．因为阅读理解题一般没有标题，所以，速读全文，抓住中心主旨很有必要，在速读的过程中，应尽可能多地捕获信息材料．其次，细读题材，各个击破．掌握全文的大意之后，细细阅读每篇材料后的问题，弄清每题要求后，带着问题，再回到原文中去寻找、捕获有关信息．最后，要善于抓住每段的主题句，阅读时，要有较强的针对性．对于捕获到的信息，要做认真分析，仔细推敲，理解透彻，只有这样，针对题目要求，才能做到稳、准．