1 . 阅读下面短文，在空白处填入1个适当的单词或括号内单词的正确形式。

The Internet has clearly affected all     1     (level) of education by providing endless possibilities for learning. I believe the future of education is a networked future. People can use the Internet to create and share knowledge and develop new ways of teaching and learning that excite students’ imagination at any time, anywhere,     2     (use) any device. By connecting and empowering students and educators, we can speed up economic growth and enhance (增强) the well-being of society throughout the world. We should work together, over a network,     3     (build) a global learning society.

The Internet is an inexhaustible (无穷尽的) source of information. What’s     4     (much), the Internet has enabled users to move away from their former passive role as recipients (接受者) of messages     5     (give) by traditional media     6     an active role, choosing what information to receive, how, and when. The information recipient even decides whether     7     not they want to stay informed.

Today, you can use the Internet to access libraries, art galleries, news archives, and other information sources from anywhere in the world: I believe this is a key advantage in the education field. The web is a(n)     8     (amaze) resource for enhancing the process of building knowledge.

Besides its communicative purposes, the Internet     9     (become) an important tool for exchanging knowledge and education since it entered our lives; it is not just an information source, but a channel (渠道) for connecting other people and groups     10     are working on related research topics.

2 . 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”.