A． prevailing
B． obvious
C． notorious
D． disastrous
参考答案A
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]。
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A． the more time people spend on media use, the less time they spend on exercising
B． the lightest media users spend more time in studying, exercising and sleeping
C． the heaviest media users are more likely to suffer healthy problems
D． the heaviest media users are more likely to have emotional problems
A． has been unexpectedly increasing
B． is sure to be on the decline soon
C． is not able to increase any more
D． is reported to reach its climax
