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据腾讯新闻 2017 年 1 月 26 日消息,最新研究表明,类似地球最简单、最远古的微生物,可幸存于火星极端稀薄的大气层中。当前火星表面干燥寒冷,但是大量证据显示,数十亿年前河流、湖泊和海洋覆盖在火星表面,由于地球液态水存在的区域就有生命,科学家猜测当火星处于潮湿气候状态下,生命体可以进化形成。据此回答下列各题。
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    The Internet, social media, and smart phones allow you to learn many things.____However, just like in the real world, not everyone online is your friend. Some may use these tools to send unpleasant messages to you, and some may use your information to do something bad. It's very important to know how to stay safe and have positive experiences online. Here are some tips for you.

    Be careful about friend or follower requests. When you have a friend or follower request, check the person's information first.____Only accept friend or follower requests from people you have met in the real world. Don't chat with people you don't know or trust. This is a good way to keep you safe.

    Review location(定位) services on your phone and other mobile devices.____They may put you in danger because others can find you easily. To make sure of your safety, turn off the "location services" or "locations settings" features on your mobile devices. Also turn off GPS for the camera, chat and other social media apps.

    ____Strong passwords (密码)should have some upper and lower-case letters, numbers and symbols. If you have a strong password, it'll be difficult for others to know it. Also, avoid having the same password for all your social and education accounts (账户). It is really not safe for your accounts.

    ____If someone sends unpleasant messages to you online, find someone you feel safe talking to. For example, you can talk to a parent, a teacher or a trusted adult and ask him to help report and block(屏蔽) the person. Don't try to do the same thing when others do something that hurts your feelings online.

A. Create strong passwords.

B. Try to get help when necessary.

C. Find out if he or she is someone you know.

D. Friend requests can tell a lot of information.

E. Talk to someone you find safe to talk to online.

F. They also allow you to talk with friends online.

G. Location services can tell others where you are.