学进去-教育应平等而普惠
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类型:阅读信息摘录
难度系数:0.65
所属科目:初中英语

   You can read up your favorite skateboard star, email or test your friends. You can do a lot of wonderful things online. That’s why the Internet is amazing! If you’re a kid who likes to have fun and chat with friends online, here’re the things you need to watch carefully in order to stay safe and avoid problems.

Not all websites are safe for students. Luckily, your parents can guide you to some websites. And you can also visit the websites your teachers suggest. Stick to these safe websites and don’t go out to try something new. Some websites don’t allow kids under a certain age to visit them. You may find it inviting and fun to lie about your age. It’s safer to tell the truth and avoid those websites until you’re older.

The loss of Internet ID can cause big problems. So it is important to make your Internet ID safe. If someone can get on the Internet in your username, you have no control over what they do or say. And everyone will think it’s you! So don’t ever let anyone know your username for the Internet. And don’t share your passwords with anyone except your parents.

Take good care of your private information. Never tell an online stranger where you live. Your address can make it much easier for bad people to find you. Your phone number is another important piece of personal information. Once it’s out online, it can bring you a lot of trouble. Many online cheatings are carried out with the help of people’s phone numbers. Your parents’ names are also private information. It is risky if they are let out online.

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y = sin x, x∈R, y∈[–1,1],周期为2π,函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x, x∈[–1,1], y∈[–π/2,π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2

用户名称
2019-09-19

y = sin x, x∈R, y∈[–1,1],周期为2π,函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x, x∈[–1,1], y∈[–π/2,π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2

用户名称
2019-09-19
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