2017届高考北师大版英语二轮复习单元限时规范练：必修5 Unit 15《learning》（含解析）_高考复习指南

　　A．ways of avoiding identity theft

　　B．tips of freeing computers from viruses

　　C．measures to ensure network security

　　D．steps to keep track of passwords

　　答案：A　主旨大意题。根据文章第二段“Don't fear: You can easily set up proper defenses. Here's how.”可推知答案。

　　2．To put new security measures into place, we need to ________.

　　A．clear out everything in the system

　　B．make a random selection of network

　　C．get rid of potential spyware

　　D．refresh the infected system

　　答案：C　细节理解题。根据“Clean Your Computer and Smartphone”部分中第一句话“...make sure your devices are as spotless as possible.”可知。

　　3．According to the passage, the risk of exposing personal information may possibly be caused by ________.

　　A．the applications of antivirus programs

　　B．the practice of using public WiFi

　　C．the difficult access to passwords

　　D．the separate credit card for online shopping

　　答案：B　细节理解题。根据“Secure Your WiFi”内容中的“It's fairly easy for potential criminals to gain access to your information...”可知答案。

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

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