问题 填空题

如图所示,小朋友从滑梯上滑下,其重力势能________(选填“增大”或“减小”),他与滑梯接触面间的摩擦是__________摩擦(选填“滚动”可“滑动”)。当他滑至水平面进,还会继续向前运动,是由于他具有___________________。

答案

减小;滑动;惯性

阅读理解

I began to send my first e-mail when I was 17. I discovered Google 5 years later. Now, I use the Internet all the time. Internet has become so popular that 90 percent of 12-to-17-year-olds in the United States use the Internet, according to one recent survey, and about half of those kids use it every day. They visit chat rooms and send e-mails. They go to Websites to get information for homework.

“Kids are now living in a virtual(虚拟的) world,” says Greenfield, “As the Internet is becoming more and more important for our life, we should worry about one question: Is the Internet good or bad for kids?”

“It’s X to answer the question because the Internet involves so many things,” says Justine, a media expert at Northwestern University. “They include networked computer games, news about politics, instant messaging and e-mails to your grandmother. ” So, more and more studies shows that the online world can be helpful in some ways and dangerous in others.

“Although it’s not easy to tell whether it’s good or bad,” says Justine, “the Internet, at least, is very useful and can be used widely by everyone in the world. ”

1. What percentage of American 12-to-17-year-olds use the Internet every day?

A. About 45%        B. About 50%         C. About 80%        D. About 90%

2.. Greenfield _______.

A. is an expect from Northwestern University

B. wants to stop all the kids from using the Internet

C. is worrying about whether the Internet is good or bad for kids

D. thinks that the Internet is good or bad for kids

3. “X” in the passage should be the word “_______”.

A. possible          B. difficult            C. easy             D. good

4. Which is the best title of the passage?

A. Don’t Use the Internet                        B. Kids and Emails

C. Is the Internet Good or Bad                    D. Two Experts from Universities

单项选择题