D. the separate credit card for online shopping

　　47.B 细节推断题。根据第四段中It’s fairly easy for potential criminals to gain access to your information if they’re able to share your connection --- that’s why you want to be careful when using public Wi-Fi.可以知道公共wi-fi容易让潜在的犯罪分子活得个人信息 ，故选B项。

　　48. To put new security measures into place, we need to ____________.

　　A. clear out of everything in the system

　　B. make a random selection of network

　　C. get rid of potential spyware

　　D. refresh the infected system

　　48.C 细节理解题。根据第三段 Before you put new security measures into place, make sure your devices are as spotless as possible. This means installing a good antivirus program and taking the time to clear out any spy- or malware that may have already infected your system. ，在采取新的安全措施时，务必要保证设备安全可靠，没有间谍软件或恶意软件，故选C项。

　　49. Which of the following is the improper way to shop online?

　　A. Adopting a unique password for every website.

　　B. Shopping online at reliable websites.

　　C. Keeping credit details safe by checking security symbols.

　　D. Monitoring credit card by storing information.

　　C

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