The Internet, as we know, is probably one of the greatest inventions of human history. Never before has the access to the collection of the world’s knowledge ever been more available. 【小题1】 Some people look to make use of the information you are providing to the Internet. Everything you do online leaves a small footprint.

There are a couple of steps you can take to make your adventures online a little safer and more secure. Let’s take a look at them.

Cover your tracks.

Whenever you visit a website, a small file is marked in your browser(浏览器), which is called a “cookie”. 【小题2】 This enables the webserver to know if you have been there before and it can tailor the presentation to your personal tastes. They are also how Facebook knows to serve you ads based on stuff you looked at on Amazon.

So what’s the harm in the cookie? Well, hackers can use the information stored in your cookies to edit a browsing history or with less secure cookies, take your passwords for some sites. If you want to protect yourself from your information being available to sites then you can turn off the generation of cookies in your browser. 【小题3】

【小题4】

The major browsers, Chrome, Internet Explorer, Firefox, and Safari are all built to be secure from snooping(窥探), but the people who write the code for the browsers are human and they make mistakes.     【小题5】 These are usually addressed very quickly, but it is important that you make sure your browser is up to date. Just like your operating system, new security patches are being applied all the time, you need to make sure you have them. Turning on automatic updates is something I highly recommend.

Big Messaging Apps Abroad

While WeChat is China’s biggest mobile messaging app, there are many similar apps in other countries that offer similar features.

WhatsApp (US)

Users: more than 300 million

Platforms: Android, iOS, Windows Phone, BlackBerry

Features: Text chat, push-to-talk, file sharing, location sharing

With more than 300 million active users, WhatsApp is one of WeChat’s biggest competitors.

Developed by two ex-Yahoo employees in 2009, WhatsApp originally focused on text chat, but on Aug. 6 it also started push - to - talk service. It’s noted for its accessibility, ease of use and the absence of advertisements. The service is free for the first year, after which $ 0.99 (6. 06 yuan) is charged for a one –year subscription.

Kakao Talk (South Korea)

Users: more than 100 million

Platform: Android, iOS, windows Phone, BlackBerry and Bada (an operate system developed by Samsung)

Features: Text chat, group chat, push–to–talk, group calls, file sharing

With more than 100 million users in more than 230 countries, Kakao Talk is a multi - platform (多平台) texting application that allows users to send and receive messages for tree. With Kakao Talk, users can message each other one-on-one or in group chats with unlimited numbers of friends. You can also choose from more than 250 animated emoticons and share them with friends.

Line (Japan)

Users: more than 200 million

Platforms: Android, iOS, Windows Phone, BlackBerry and PC

Features: Text chat, group chat, push–to–talk, file sharing, location sharing, gaming, stickers

Line tops the list of the most downloaded free apps in 52 countries. Apart from text and voice messaging, Line provides its users with more than 250 original stickers and emoticons to buy from its own shop. In the first quarter of 2013 alone, it made $ 17 million just from stickers. The popular app also allows friends to battle each other in the Line games.

Downloading files is one of the primary uses of the Internet. You can find virtually anything online, and chances are that you've been downloading files ever since you started using your computer. Your Operating System will attempt to put all of your downloads in one central location, but eventually you may have downloaded files all over your computer. Knowing how to quickly find your downloaded files can save you a lot of time and headache.

● Check your Downloads folder（文件夹）. Windows includes a Downloads folder that acts as the default (默认的) download location for most programs for every user. There are a couple of ways you may be able to find your Downloads folder:

Click the Start menu and then click your user name. You should see a Downloads folder in the window that opens.

Open Windows Explorer ⊞ Win+E. Your Downloads folder may be listed in the left frame under "Favorites" or "Computer/This PC".

Press ⊞ Win+R and type shell: downloads. Press ↵ Enter to open the Downloads folder.

● Check other locations. If you download with a lot of programs, chances are that your downloads have become a bit spread out. Other popular places for your downloads to appear are your Desktop and your Documents/My Documents folder.

If you have a secondary drive that acts as a file storage, check to see if you've created a download folder on it as well.

● Search for the file. If you know the name of the file you downloaded, you can search for it to quickly open it. Press ⊞ Win and start typing the name of the file. You should see it appear in the search results.

● Open your downloaded files. You shouldn't have much difficulty opening most files that you download online, but you may run across a few file types that can give you problems. See the guides below for details on opening these troublesome files.

Playing MKV video files

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