TheInternetplaysabigpartinhumanlife.Weuseitforworkanden...

問題詳情：

The Internet plays a big part in human life. We use it for work and entertainment. We can find new recipes on the Internet or advice on staying healthy. We can even use it to learn a new language. We can use the Internet to keep in contact with family and friends and stay in touch with issues we care about. The list goes on and on. So, there may be no going back to an Internet-free life. But can using the Internet too much be bad for our health? It might be, say researchers. A new study finds that heavy Internet use may be connected to high blood pressure in an unlikely group---teenagers. So, try to be a responsible guardian（監護人）.

   The study results show that teens who spend at least 14 hours a week online were more likely to have high blood pressure. High blood pressure makes your heart and blood vessels work too hard. Over time, this extra strain increases your risk of a heart attack or stroke. High blood pressure can also cause heart and kidney disease. It is also closely linked to some form of dementia（痴呆）, or a brain disease.

   The Henry Ford Hospital in Detroit, Michigan did the study. It involved 335 young people, from 14 to 17 years old. One hundred thirty-four of the teens were described as “heavy Internet users”. Researchers say the study is the first one to connect heavy web use with high blood pressure. Other research has connected that heavy Internet use with health problems including anxiety, depression and obesity.

   The lead researcher of the study is Andrea Cassidy-Bushrow. For the purpose of the study, she explains, teens considered heavy Internet users were online on average 25 hours a week. It is important for teens to take regular breaks from their computers or smart phones and to do some kind of physical activity. She also suggests that parents limit their children’s use of the Internet to two hours a day, five days a week.

   The Centers for Disease Control and Prevention (CDC) says, 70 million, or 29%, of American adults have high blood pressure. The CDC estimates that high blood pressure costs the United States ＄46 billion each year.

28. The author mainly wants to tell us ______.

  A. how to prevent high blood pressure.

  B. too much Internet use may be bad for teenagers.

  C. it’s necessary for teenagers to avoid the Internet.

  D. heavy Internet use will worsen teenagers’ memory.

29. The first paragraph of the text is used to ______.

  A. introduce the topic                  B. analyze the causes

  C. offer some opinions                 D. make some suggestions.

30. According to Casssidy-Bushrow, teenagers’ use of the Internet should be limited to_____.

  A. 25 hours a week                    B. two hours a week

  C. ten hours a week                    D. five hours a week

31. The text is mainly intended for _______.

  A. parents                           B. teachers

  C. web-designers                      D. students

【回答】

BACA

知識點：科普環保類閲讀

題型：閲讀理解