Children and teenagers who spend lots of time in front of screens---especially TVs---are easier to get more weight as they grow, according to a new study.
The findings agree with the research suggesting all that inactive sitting and always watching advertisements may lead to poor eating habits.
Researchers used results from a long-term study of children who took part in the surveys every two years. Children were between ages 9 and 16 when the study started. Out of 4,300 girls in the study, 17 percent were overweight or obese（肥胖的）. Twenty-four percent of the 3,500 boys were also above a healthy weight.
The surveys included questions about their height and weight as well as how much time they spent watching TV and DVDs and playing computer and video games.
From one survey to the next, each one-hour increase in children’s daily TV watching was in connection with an increase of about 0.1 points on a body mass index (BMI)（体质指数）, which measures weight in connection with height. There’s an increase of about half a pound in weight per extra hour of TV.
“The weight of the evidence is so strong that television watching is connected with unhealthy changes in weight among youth,” says Jennifer Falbe, who led the study while at the Harvard School of Public Health in Boston.
“It's important for parents to know that all the obesity-causing（引起肥胖的）screens really should be limited in their children's lives.” Falbe says. “When children watch TV, there are many food advertisements on TV that might lead them to eat a cookie or drink a soft drink.” What's more, she says, “they can get into a hibernating(冬眠) state on the sofa, even if children are sitting down while playing a computer game.”
小题1:Which of the following statements can be the best title for the text?
A．A new study on screens.
B．TVs do harm to children.
C．The less TV time, the fatter.
D．Too much screen time leads to obesity.小题2: How many children took part in the study?
A．4,300
B．3,500
C．7,800
D．9,800小题3:According to the study, one extra hour screen time will cause children about ______ pound
fatter.
A．0.1
B．0.5
C．0.3
D．0.7小题4:According to Falbe , what should parents do to stop children getting fat?
A．Limiting the time of children watching TV.
B．Buying children food advertised on TV.
C．Not allowing children to watch TV.
D．Encouraging children to play computer games.
小题1:D
小题2:C
小题3:B
小题4:A
题目分析：根据一项研究，青少年长时间对着屏幕，特别是电视，容易超重，文章具体介绍这项调查的证据和解决这个问题的方法。
小题1:主旨题：根据全文的内容和第一段的句子：Children and teenagers who spend lots of time in front of screens---especially TVs---are easier to get more weight as they grow, according to a new study.可知这篇文章讲的是在屏幕面前待的时间太长会导致肥胖。所以选D。
小题2:细节题：根据第三段的句子：Out of 4,300 girls in the study, 17 percent were overweight or obese（肥胖的）. Twenty-four percent of the 3,500 boys were also above a healthy weight.可知一共是7800名儿童参加了研究，所以选C。
小题3:细节题：根据第五段的句子：There’s an increase of about half a pound in weight per extra hour of TV.可知在电视前面多呆一个小时会增加1.5磅的重量。所以选B。
小题4:细节题：根据最后一段的句子：“It's important for parents to know that all the obesity-causing（引起肥胖的）screens really should be limited in their children's lives.”可知解决这个问题的方法是限制孩子看电视的时间。所以选A。