单选题 The average young American now spends practically every waking minute—except for the time in school, though reluctantly—using a smart phone, computer, television or other electronic devices, according to a new study.
Those ages 8 to 18 spend seven and a half hours a day with such devices, compared with less than six and a half hours five years ago. And that does not count the hour and a half that youths spend texting, or the half hour they talk on their cellphones. And because so many of them are multitasking—say, surfing the Internet while listening to music—they pack on average nearly 11 hours of media content into that seven and a half hours.
The study's findings shocked its authors, who had concluded in 2005 that use could not possibly grow further, and confirmed the fears of many parents whose children are constantly tethered to media devices. ^① It found, moreover, that heavy media use is associated with several negatives, including behavior problems and lower grades.
Dr. Michael Rich, a pediatrician at Children's Hospital Boston who directs the Center on Media and Child Health, said that with media use so ubiquitous, it was time to stop arguing over whether it was good or bad and accept it as part of children's environment, "like the air they breathe, the water they drink and the food they eat. "
Contrary to popular wisdom, the heaviest media users reported spending a similar amount of time exercising as the light media users. Nonetheless, other studies have established a link between screen time and obesity.
While most of the young people in the study got good grades, 47 percent of the heaviest media users—those who consumed at least 16 hours a day—had mostly C's or lower, compared with 23 percent of those who typically consumed media three hours a day or less. The heaviest media users were also more likely than the lightest users to report that they were bored or sad, or that they got into trouble, did not get along well with their parents and were not happy at school. The study could not say whether the media use causes problems, or, rather, whether troubled youths turn to heavy media use.
"This is a stunner," said Donald F. Roberts, one of the authors of the study. "In the second report, I remember writing a paragraph saying we've hit a ceiling on media use, since there just aren't enough hours in the day to increase the time children spend on media.^② But now it's up an hour. /

单选题 It can be inferred that young Americans probably ______.

【正确答案】 A

【答案解析】推断题。由题目中的young Americans定位至首段首句，句中的reluctantly表明学生们不是自愿这样做的，可以推断出可能是被迫所为，故[A]为答案。首段首句提到“using a smart phone, computer, television or other electronic devices”，但并未比较它们之间的受欢迎程度，排除[B]；这里也没有提到学生对新的电子产品的态度，[C]无依据，排除；[D]项为绝对项，直接排除。

单选题 As to the time youngsters spend on electronic devices, they spend ______hours a day altogether.

【正确答案】 C

【答案解析】细节题。由选项中的内容定位至第二段。首句和第二句说明学生花在使用电子设备上的总的时间是7.5+1.5+0.5=9.5小时，故[C]为答案。“compared with less than six and a half hours five years ago”表明6.5小时是5年前的数字，排除[A]；而7.5小时是第二段首句提到的时间，但是没有包括发送短信以及通电话的时间，题干中的altogether表明这是总时间，排除[B]；末句表明是11个小时的内容，但实际未花11个小时，排除[D]。

单选题 Which of the following statements is NOT true?

单选题 The word "ubiquitous" in Paragraph 4 is close in meaning to______.

【正确答案】 A

【答案解析】语义题。由题目定位至第四段。这一段表明．media use已经成为日常生活中的常见现象了，再结合前面的数据可以得出prevailing“普遍的”与ubiquitous语义接近，故[A]为答案。“it was time to stop arguing over whether it was good or bad and accept it as part of children's environment”表明说话者对media use认同，觉得无需反对，故[C]notorious“臭名昭彰的”和[D]disastrous“灾难的”不符合此处语境，均排除；而[B]obvious意为“明显的”，干扰性较强，但“like the air they breathe, the water they drink and the food they eat”表明media use的普及程度，而并非是否显而易见，排除[B]。

单选题 It can be inferred from the passage that generally people believe that______.

【正确答案】 A

【答案解析】推断题。由选项中的the heaviest media users定位至第五段。首句中的reported表明“花大量时间使用媒体设备和花较少时间使用媒体设备的人锻炼时间相差无几”是研究得出的结论，而这个结论是“Contrary to popular wisdom”的，可见大众观点是[A]项内容，故为答案。此处只提到两种人在锻炼时间上差不多，没有涉及学习和睡眠时间，[B]无依据，排除；第五段最后一句表明使用媒体设备和肥胖之间有联系，但这是other-studies的研究成果，没有说是大众看法，排除[C]；同理，第六段第二句是本次的研究结论，不是大众看法，排除[D]。