The researchers say the study is the first to connect heavy web use and 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. In a statement she said, "Using the Internet is part of our daily life but it shouldn’t consume us."

　　For the purpose of the study, she explains, teens considered heavy Internet users were online on "average 25 hours a week."

　　Ms. Cassidy-Bushrow adds that it is important for teens to take "regular breaks from their computers or smartphones" 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.

　　28. The first two paragraphs mean that _________.

　　A. the list of the function of the Internet is too long to be endless

　　B. the Internet has too many uses to count

　　C. the number of the people in the world use the Internet too many to count

　　D. the list of the uses of the Internet is being lengthened day by day

　　29. The reason of increasing people’s risk of a heart attack or stroke is that _______.

　　A. they use the internet too much

　　B. they pay little attention to their health

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