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阅读理解，阅读下列短文，从每题所给的四个选项(A、B、C和D)中，选出最佳选项。

　　“Sleep-disordered breathing” is a term for a group of conditions that can interfere with nornlal breathing while people sleep．These include snoring, mouth-breathing and sleep apnea(窒息)．Sleep-disordered breathing can do more than just leave people feeling tired the next day．It can also affect people's health．In children the effects can include behavioral and emotional problems．

　　In a new study．1ed by Karen Bonuck at the Einstein College of Medicine．researchers asked parents about their children's breathing from when they were babies up to about age seven．The study finds sleep-disordered breathing is associated with a fifty percent increase in outcomes including hyperactivity(多动症), aggressiveness and problems relating to other children．

　　Ms．Bonuck says the more serious the breathing problems, the more serious the behavioral issues were likely to be．Other studies have：linked sleep with children's behavior, but this study was extensive enough to：reject other possible causes．

　　How well do you sleep? A popular belief is that sleep gets worse with age．But．in another new study, those who reported the fewest problems with the quality of their sleep were people in their eighties．

　　Researchers did a telephone survey of American aduhs．Michael Grandner at the University of Pennsylvania medical school says the original goal was to confirm that aging is connected with increased sleep problems．The survey did find an increase during middle age, worse in women than men．But except for that, people reported that their sleep quality improved as they got older．At least they felt it did．

　　Mr．Grandner says．“Even if sleep among older Americans is actually worse than in younger adults, feelings about it still improve with age．”

　　In the study, health problems and depression were linked with poor sleep．But, based on the study．Mr．Grandner says older people who are not sick or depressed should be reporting better sleep．“If they're not．they need to talk to their doctor．”he says．He says heahtlh care providers generally dismiss sleep complaints from older adults as a normal part of aging．

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阅读理解

请认真阅读下列短文，从短文后备题所给的A、B、C、D四个选项中，选出最佳选项。

　　You are about to say something to your younger brother when he gestures that he’s got a phone message．

　　“But I didn’t hear the ring, ”you say．

　　“Because you are too old, ”your brother answers．

　　Don’t get mad．He’s just telling you the truth．

　　Teenagers in Britain and the US have a weapon against the older generation, especially parents and teachers．It’s a ring tone that many adults cannot hear．

　　According to a recent report from the New York Times, in some Manhattan schools, students have begun using the technology．Cellphone use is usually forbidden in class．But using the high-pitched(频率)ring tone, students can successfully exchange phone messages without being found by their teachers．

　　The technology relies on the fact that most adults gradually lose the ability to hear high-pitched sounds, It was developed in Britain but has recently spread to America by the Internet．

　　However, the technology was originally aimed at annoying teenagers, not the other way around．

　　Called the Mosquito, it was marketed last year by a Welsh security company．It is an ear-splitting 17-kilohertz buzzer(蜂鸣器)designed to help shopkeepers get rid of young people hanging around in front of their stores．Humans can hear sounds taking place in a frequency range between 200 and 20,000 hertz, as the research shows．But our hearing gradually becomes worse when we grow up．

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