1 . 互联网已经成为高中生学习和生活的重要部分，但在利用网络时，难免有一些不愉快经历。你是学生会主席李华，为营造健康文明的网络环境，请以学生会的名义，向全校同学写一封倡议书。
内容包括：
1. 倡议的原因；
2. 具体的提议；
3. 发起呼吁。
注意：1. 字数80左右；
2. 可适当增加细节，以使行文连贯。
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2 . ZHAO ZHIZHONG, a professor of geography at Hainan Normal University, recently proposed to make the law and forbid pupils below the age of 16 to use smartphones. Beijing Youth Daily comments:

With the prosperity of the economy, many families choose to buy a smartphone for their children at school to search for materials and assist in studying.     1    .

In and out of class, the pupils have smartphones in their hands.     2    . While enjoying their lunch, they hold them in their hands. Even on the bed before sleeping, they hold one in their hands.

It seems the heavy addiction to smartphones is affecting ever more pupils at young ages.     3    . The addiction to smartphones, which is popular among pupils, is a problem that affects them in many aspects. It distracts them from their academic studies and prevents them from talking with each other. That’s why quite many people agree to limit the use of smartphones among pupils. That’s also why Zhao’s proposal got quite a wide welcome among the public.

    4    . This is because smartphones, if used well, do play a key role in helping the pupils get wider access to the outside world and broaden their horizon. Besides, the school might not have the power to forbid pupils from using their own properties that do not pose harm to others.

There are certain countries that limit pupils from using smartphones in class but allow them to use them after it.     5    . But that can offer some food for thought.

A．While walking, they hold them in their hands.

B．So a flexible ban can be considered to avoid the trouble.

C．They, just like their parents, have become enslaved by smartphones.

D．However, it remains doubtful whether a simple ban is proper.

E．Perhaps a child model for smartphones can also be introduced.

F．The actual effect remains to be seen.

G．In fact, when children get their smartphones, the situation is different.

3 . Millions of people go online each day only for fun or to pass the time. Besides the list of things like books, music, movies and televisions, you can now add surfing the Internet as a primary way of entertainment and passing the time.

So how many people actually use the Internet today? According to some reports, about 40% of the world’s population has a connection with the Internet. That’s a huge increase from only 1% in 1995.

The number of Internet users continues to grow. In 2005, the number of Internet users was more than one billion. Just five years later, that number doubled to over two billion. In 2014 that number passed the three billion mark!

Today, about 75% of all Internet users live in the top 20 countries. The other 25% are spread out amongst the remaining countries. The country with the most Internet users is China with over 640 million users. The total is more than the next three countries—the United States, India and Japan—combined.

Of all those billions of Internet users, a large part of users are children. From computers in schools to mobile devices, children are growing up in a connected world. Studies have shown that over 75% of children spend more than two hours each day of “screen time”, which means time is spent in front of a computer or mobile device.

Too much “screen time” can be harmful to children. For example, too much screen time has been linked to many problems, such as high blood pressure, high cholesterol（胆固醇） and overweight. What’s more, school-age children who use a computer more than two hours per day are more likely to have emotional, social, and attention problems. Thus, if you’re one of the 75% that spend more than two hours per day in front of a screen, consider cutting back and getting outside to enjoy the natural world.

1. How does the author prove that more and more people use the Internet?

A．By explaining a rule.

B．By telling an interesting story.

C．By introducing an experiment.

D．By showing the changes of numbers.

2. Which of the following can replace the underlined word “combined” in paragraph 4?

A．put up

B．taken up

C．added up

D．made up

3. Why does the author discuss the harmful effects of “screen time” in the last paragraph?

A．To explain why “screen time” is useful.

B．To stress the importance of “screen time”.

C．To voice his view on less “screen time”.

D．To show the difficulty of quitting “screen time”.