阅读下列短文，从短文后各题所给出的A、B、C、D四个选项中选出最佳答案。

　　Why can some people sleep through noises like a honking car or flushing toilet, while others are awakened by the lightest sound?

　　To find the answer, sleep researchers at Massachusetts General Hospital conducted an unusual study of 12 self－described deep sleepers．After tests confirmed that the healthy volunteers were solid sleepers, they took part in a three-night study in the university's sleep laboratory．The participants spent the night in a big and comfortable room．But the room also included four speakers positioned near the top of the bed．

　　During the night, the deep sleepers were subjected to 14 different recorded sounds, like street traffic, toilets flushing, and an airplane flying overhead．Next door, the researchers monitored their sleep patterns and brain waves．

　　As expected, all of the participants slept relatively well, but there were differences in how they responded to the noisy interruptions．Some of the sleepers didn't wake up even when a sound was blasted at 70 decibels(分贝)；others were awakened by sounds at 40 or 50 decibels．

　　The researchers discovered that the difference in a sleeper's reaction to noise could be predicted by the level of brain activity called “sleep spindles(纺锤体)”．A sleep spindle is a burst of high－frequency brain activity coming from deep inside the brain during sleep．The source of the spindles is the thalamus(丘脑), a part of the brain that sends sensory information to the rest of the cortex(皮层)．

　　Before the study, the Massachusetts researchers theorized that the spindles are the brain's way of preventing sensory information from passing through the thalamus and waking the rest of the brain during sleep．They found that sleepers who experienced the most sleep spindles during the night were also the soundest sleepers and were least likely to be awakened by noise．

　　Scientists already know that most people become lighter sleepers with age, most likely because older people experience less “slow wave sleep”, which is the deepest stage of sleep．People also produce fewer sleep spindles as they age．But even when controlling for the stage of sleep a person was in, the number of sleep spindles still predicted their risk for awakening because of noise．

　　More research is needed, but the findings suggest that a better understanding of sleep spindles could lead to new behavioral or drug therapies for people with sleep disorders．For example, future studies may try to determine whether diet, exercise or other behaviors may influence the number of sleep spindles a person produces during the night．

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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。

　　It feels like every time my mother and I start to have a conversation, it turns into an argument．We talk about something as simple as dinner plans and suddenly, my mother will push the conversation into World War 3．She'll talk about my lack of bright future because I don't plan to be a doctor．And much to her disappointment, I don't want to do any job related to science, either．In fact, when I was pushed to say that I planned to major(主修)in English and communications, she nearly had a heart attack．

　　“Why can't you be like my co-worker's son?” she bemoans all the time．Her coworker's son received a four-year scholarship and is now earning 70,000 dollars a year as an engineer．I don't know what to answer except that I simply can't be like Mr．Perfect as I've called the unnamed co-worker's son．I can't be like him．I am the type of the person who loved to help out in the community, write until the sun goes down, and most of all, wants to achieve a career because I love it, not because of a fame or salary．

　　I understand why my mother is worried about my future major．I've seen my mother struggle to raise me on her small salary and work long hours．She leaves the house around 6:30 am and usually comes home around 5 pm or even 6pm．However, I want her to know that by becoming a doctor, it doesn't mean I'll be successful．I'd rather follow my dreams and create my own future．

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　　Why can't my daughter manage her life better?She is 17 and an honor student, but she seems to be wasting her life away with a boyfriend who is holding her back．

　　He consumes every waking, minute of her precious time and smooth-talks her as well．

　　His goal is to get her to agree to go to the college of his choice, not her choice, and because his grades are lower, his choice will be limited．

　　I feel like I want to rescue her, but she pushes me away and shuts me out．She has only brought us pride and joy; and now this!Help!

　　Hmmmmm．What's the matter with kids today?Remember that song from“Bye Bye Birdie”?

　　Well if you do not, let me fill you in about teenagers and their life-management skills．Do not expect too much too soon because at the ripe age of 17, life-management is not within their reach, not should it be．

　　Life experience creates both the conditions and the skills for management, and if management went before experiene, there would be tittle of it．

　　Your daughter is an honor student for good reasons．She is smart, studies with intelligence and you have given her good Values．

　　When the time comes for her to apply for college, and she visit the ones that were specifically desigened for student the top of their grade, she will most likely break away from her boyfriend's influenee．

　　It is rare for an honor student to change the path of their academic career for puppy love．That being said, them might be some adoldscent wisdom in her behavior after all．

　　Perhaps she is choosing to worry you, her parents, for unconscious reasons．Being such a good girl and being a steady source of joy might have become a bit too much for her．

　　Let your daughter have her own private moment of 11^th grade rebellion．She deserves a break from perfection．

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