Question

6．PALO AITO，California-"Switching off the television may help prevent children from getting fatter--even if they do not change their diet or increase the amount they exercise，"US researchers said last week．
A study of 192 third and fourth grades students，generally aged eight and nine，found that children who cut the number of hours spent watching television gained nearly two pounds （0.91kg ） less over a one-year period than those who did not change their television diet．
"The findings are important because they show that weight loss can only be the result of a reduction in television viewing and not any other activity，"said Thomas Robinson，a pediatrician （兒科專家）at Stanford University．
"American children spend an average of more than four hours per day watching television and videos，and rates of childhood being very fat have doubled over the past 20 years，"Robinson said．
In the study，presented this week to the Pediatric Academic Societies'annual meeting in San Francisco，the researchers persuaded about 100 of the students to reduce their television viewing by one-quarter to one-third．
Children watching fewer hours of television showed a significantly smaller increase in waist size and had less body fat than other students who continue their normal television viewing，even though neither group ate a special diet nor took part in any extra exercise．
"One explanation for the weight loss could be the children unstuck to the television may simply have been moving around and burning off calories，"Robinson said．
"Another reason might be due to eating fewer meals in front of the television．Some studies have suggested that eating in front of the TV encourages people to eat more，"Robinson added．
39．What do the first two paragraphs imply？D
A．Children in the US are tired of watching TV．
B．Watching TV can help children to loose weight．
C．Younger children watch more TV than older ones．
D．More TV viewing is harmful to children's health．
40．In average，the time American children spend watching TVA．
A．is more than four hours a day
B．is less than four hours a day
C．has doubled in the last twenty years
D．is more than doing any other things
41．The researchers made sure the students didn't change their diet in order toD．
A．keep them from getting too heavy
B．enable them to do more exercises
C．reduce their time watching TV
D．make their findings more believable
42．According to the passage，why can watching TV increase kids'weight？A
A．They usually eat more while watching TV．
B．They change their diet while watching TV．
C．They burn off more calories while watching TV．
D．They don't want to take exercise while watching TV．

Answer 1

分析 本文主要講的是關(guān)掉電視有助于防止兒童發(fā)胖的問題，并進(jìn)行大量實(shí)驗(yàn)進(jìn)行驗(yàn)證，美國兒童看電視時(shí)間太長，文章建議減少孩子看電視的時(shí)間，并分析原因．

解答 39．D．細(xì)節(jié)理解題．根據(jù)前兩段中"Switching off the television may help prevent children from getting fatter"以及"found that children who cut the number of hours spent watching television gained nearly two pounds"可知，這些都是看電視的危害．故選D．
40．A．細(xì)節(jié)理解題．根據(jù)第四段第一行"American children spend an average of more than four hours per day watching television and videos or playing video games．"可知．故選A．
41．D．細(xì)節(jié)理解題．根據(jù)文中第六段中敘述可知，不改變其飲食是為了控制變量，改變的只是看電視的時(shí)間長短，使實(shí)驗(yàn)更有說服力．故選D．
42．A．細(xì)節(jié)理解題．根據(jù)文中最后一句話"eating in front of the TV encourages people to eat more"可知．故選A．

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