Question

7．Your DNS cache （域名存儲器）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 （詢問）nameservers （域名服務(wù)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（輸出信息）．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 短文主要講述了當(dāng)瀏覽過的網(wǎng)頁無法查看時，不同電腦系統(tǒng)的解決方案不同．

解答 25．B，細(xì)節(jié)理解題，根據(jù)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選項沒有提到．
26．B，主旨大意題，根據(jù)短文提到的是當(dāng)DNS緩存過的頁面無法查看時，不同系統(tǒng)的解決方法，故答案為B．
27．A，細(xì)節(jié)理解題，根據(jù)句子Your DNS cache （域名存儲器）stores the locations （IP addresses）of web servers 可知，域名存儲器儲存著訪問過的網(wǎng)頁地址，故答案為A．

點(diǎn)評 解答任務(wù)型閱讀理解題，首先對原文材料迅速瀏覽，掌握全文的主旨大意．因為閱讀理解題一般沒有標(biāo)題，所以，速讀全文，抓住中心主旨很有必要，在速讀的過程中，應(yīng)盡可能多地捕獲信息材料．其次，細(xì)讀題材，各個擊破．掌握全文的大意之后，細(xì)細(xì)閱讀每篇材料后的問題，弄清每題要求后，帶著問題，再回到原文中去尋找、捕獲有關(guān)信息．最后，要善于抓住每段的主題句，閱讀時，要有較強(qiáng)的針對性．對于捕獲到的信息，要做認(rèn)真分析，仔細(xì)推敲，理解透徹，只有這樣，針對題目要求，才能做到穩(wěn)、準(zhǔn)．