单项选择题 Crystal Ear One day a friend asked my wife Jill if I wanted a hearing aid. 'He certainly does, 'replied Jill. After hearing about a remarkable new product, Jill finally got up the nerve to ask me if I'd ever thought about getting a hearing aid. 'No way,' I said. 'It would make me look 20 years older.' 'No, no,' she replied. 'This is entirely different. It's Crystal Ear!'Jill was right. Crystal Ear is different--not the old-styled body worn or over-the-ear aid, but an advanced personal sound system so small that it's like contacts (隐性眼镜) for your ears. And Crystal Ear is super-sensitive and powerful, too. You will hear sounds your ears have been missing for years. Crystal Ear will make speech louder, and the sound is pure and natural.I couldn't believe how tiny it is. It is smaller than the tip of my little finger and it's almost invisible when worn. There are no wires, no behind-the-ear device. Put it in your ear and its ready-to-wear mold (形状) fits comfortably. Since it's not too loud or too tight, you may even forget that you're wearing it! Use it at work or at play. And if your hearing problem is worse in certain situations, use Crystal Ear only when you need it.Hearing loss, which occurs typically prior to teenage years, progresses throughout one's lifetime. Although hearing loss is now the world's number one health problem, nearly 90 percent of people suffering hearing loss choose to leave the problem untreated. For many millions, treating hearing loss in a conventional way can involve numerous office visits, expensive testing and adjustments to fit your ear. Thanks to Crystal Ear, the 'sound solution' is now convenient. Almost 90 percent of people with mild hearing loss, and millions more with just a little hearing drop-off (下降), can be dramatically helped with Crystal Ear. Moreover, its superior design is energy-efficient, so batteries can last months. Crystal Ear is now available to help these people treat their hearing loss with a small hearing amplifier (放大器). 第 36 题 Initially the writer did not want to buy a hearing aid becauseA． it would make him look old.B． it would make him nervous.C． it was too expensive.D． it was old-styled.

问答题 M．Green在果蝇中发现了一个特殊的X连锁的焦刚毛（sn）基因。雌性纯合体具有焦刚毛，但在它们的头、胸、腹部有许多区域具有sn+（野生型）刚毛。该雌性纯合体果蝇与sn雄性杂交时，一些雌性亲本仅产生焦刚毛后代，而另一些雌性亲本则以可变的频率产生焦刚毛和野生型的后代。试解释之。

单项选择题 根据下列材料请回答 16～22 题：Sleep Problems Plague the Older SetOlder Americans often have difficulty getting a good night’S rest.It's a huge quality—of-life problem，experts say，because contrary to popular belief，seniors require about the same amount of sleep as younger adults.“Sleep problems and sleep disorders are not an inherent(固有的)pa rt of aging，”said Dr.Harrison G.Bloom，an associate clinical professor of geriatrics(老年病学)and medicine at the Mount Sinai School of Medicine in New York City.“It’S pretty much of a myth that older people need less sleep than younger people.”Yet in a study published recently in The American Journal of Medicine，researchers found that more than half of older Americans have problems getting the sleep they need.older people tend to have“sleep fragmentation，”meaning they wake up more often during the night，said study author Dr.Julie Gammck，an assistant professor of medicine in the Division of Geriatric Medicine at St.Louis University.They also seem to get less“REM”sleep，the type of sleep during which rapid eye movement occurs，Bloom added.It’s unclear what role these naturally occurring changes in sleep patterns have on person’s quality of life，Bloom said.“What is important，though，is that older people often have actual sleep disorders and problems with sleep，”he said.And，experts say，there is usually more than one cause.“Sleep trouble in older adults is typically associated with acute and chronic illnesses，including specific sleep disorders like sleep apnea(呼吸暂停)and restless leg syndrome that appear with greater frequency in older populations，”said Michael V.Vitiello , a professor of psychiatry and behavioral sciences and associate director of the University of Washington’S Northwest Geriatric Education Center.Taking multiple medications，as many older people do，can also lead t0 fatigue a“ hypersomnia ，”or being tired all the time，Bloom added.Another big problem，he noted，IS depression and anxiety.“Those are very commonly associated with sleep problems.”Despite the prevalence(流行)of sleep difficulties in older adults，many patients Aren’t getting the help they need。As a result，problems like insomnia(失眠)，restless leg syndrome and sleep apnea are underdiagnosed and undertreated，Bloom said. 第 16 题 Sleep problems can seriously affect one’s quality of lifeA．Right B．Wrong C．Not mentioned