The Internet plays a big pan in human life.We use it for work and pleasure.We use it to lean a new language.We find advice on it.We use it to connect with family and friends.We use it to stay in touch with events we care about.The list goes on and on.
   As far as the Internet being a part of our lives，well that train has left the station.There is 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 a young group：teenagers.
   The study results show that teens who spend at least 14 hours a week only online may cause high blood pressure，which makes your heart and blood vessels （血管）work too hard.Over time，this extra pressure increases your risk of a heart attack.High blood pressure can also cause heart and other diseases.
   The Henry Ford Hospital in Detroit，Michigan did the study.335 young people，from 14 to 17 years old，took part in it 134 of the teens were described as "heavy Internet users".And researchers found that out of these 134 teens，26 had high blood pressure.The researchers say the study is the first to connect heavy web use with high blood pressure.
   The lead researcher is Andrea Cassidy Bush row.She said，"Using the Internet is part of our dally life，but it shouldn't ruin us. " Ms.Cassidy Bushrow adds that it is important for teens to stop to have a rest regularly from their computers or smartphones and do some kind of physics-activity.She also suggests that parents shouldn't let their children use the Internet for more than two hours a day，five days a week.

（1）What does the underlined part "That train has left the station." mean in paragraph 2？

A

A

A．life without the Internet is nowhere to be found.
B．there is something wrong with the station.
C．the train has stopped at the wrong station.
D．the train has changed its course.
（2）What is Para，3 mainly about？

D

D

A．Ways to prevent high blood pressure.
B．The advantages of Internet use.
C．The disadvantages of Internet use.
D．The harm of high blood pressure.
（3）Andrea Cassidy Bushrow would agree that

D

D

.
A．teenagers shouldn't use the Internet
B．the Internet will ruin human life in the future
C．smartphones are more harmful than computers
D．regular breaks are necessary when using the Internet
（4）What can be used as the best title of the passage？

C

C

A．Heavy Internet users are mostly teenagers.
B．How to prevent teenagers from the Internet.
C．Too much Internet use may be bad for teenagers.
D．Every coin has two sides - so does the Internet.