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    CHICAGO- Have you ever worked on your laptop computer with it sitting on your lap, heating up your legs? If so, you might want to rethink that habit from now on. Doing it a lot can lead to “toasted skin syndrome (症状)”, an unusual-looking spotted skin condition caused by long-term heat exposure (暴露), according to medical reports.
    In one recent case, a 12-year-old boy from California developed a skin discoloration on his left lap after playing computer games a few hours every day for several months. “He recognized that the laptop got hot on the left side; however, he did not change its position, ” Swiss researches reported in an article published Monday in the journal Pediatrics.
    Another similar case is a Virginia law student who needed treatment for the spotted darkening on her leg. Dr. Kimberley Salkey, who treated the young woman, learned the student spent about six hours a day working with her computer placed on her lap. As Dr. Salkey later learnt, the temperature under the laptop could reach 51 degrees. That case, from 2007, is one of 10 laptop-related cases reported in medical journals in the past six years.
    The condition can also be caused by overuse of heating pads (垫子) and other heat sources that usually aren't hot enough to cause burns. It's generally harmless but can also cause such permanent (永久的) skin darkening. In very rare cases, it can cause damage leading to skin cancers, said the Swiss researchers, Drs. Andreas Arnold and Peter Itin from University Hospital Basel. They do not mention any skin cancer cases linked to laptop use, but suggest, to be safe, placing a carrying case under the laptop if you have to hold it on your lap.
    Dr. Kimberley Salkey said that under the microscope, the affected skin is similar to skin damaged by long-term sun exposure.
    Major producers including Apple and Dell warn against placing laptops on laps or exposed skin for long periods of time because of the risks for burns. In the past, “toasted skin syndrome” has happened to workers whose jobs require being close to a heat source, including bakers and glass blowers, and in people who gathered near hot stoves to stay warm.
    Dr. Anthony J. Mancini, chief at Children's Memorial Hospital in Chicago, said that it's unlikely that computer use would lead to cancer since it's so easy to avoid close skin contact (接触) with laptops.

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    In August 1999,Yuriko noticed that her daughter,Ayako,was looking thin and pale,1 she insisted that the 22-year-old see a doctor.As they waited for the rest results,the doctor2 gave Yuriko a note while her daughter wasn't noticing.

    In the restroom,Yuriko opened the note,“It is stomach cancer,“said the doctor.“Please3There is no time.”

On September 21,Ayako had a(n)4Three quarters of her stomach were removed.The doctor 5 the situation to Yuriko but the medical terms sounded like a foreign language.

    Ayako was put on anti-cancer drugs,and over the next three months,she 6 from side effects,and lost seven kilograms.

    Yuriko decided to do more to 7 her daughter.She read all kinds of books on cancer.As a single mother,she had no one to share her 8with.

9 the difficulties,Yuriko was able to help her daughter.When Ayako started experiencing breathing difficulties,Yuriko 10 if it could be a side effect of the anti-cancer drug.She told Ayako's doctor and he 11to take her off the drug.

    12in November 2002,Ayako's treatment came to an end.Although she felt her pain 13Yuriko couldn't forget how lost and 14 she felt during her daughter's treatment.She wrote a letter to the local newspaper 15the creation of a support group for cancer patients.

    Phone calls and letters 16 her idea started pouring in.In December 2002,Yuriko formally17 Ikkikai,roughly meaning “sharing the joy”,with the18of providing hope and information for people with cancer,and their families.

    Ikkikai's message has begun to 19Yuriko says,“The simple act of talking to other people who understand your problems can make the greatest 20I hope that more people would join in the group.”

用二倍体西瓜为亲本，培育“三倍体无籽西瓜”过程中，下列说法正确的是（   ）

某些空调器生产企业抛出令人震惊的超低价格，结果返修率、退货率超过50％以上，消费者深受其害。这些消费者受害是因为上述空调器

聂卫平曾说过这样一句话：“围棋就像小鬼，我对它研究的越深，就越觉得搞不清楚。”聂老的这句话阐述了研究围棋就像追求真理，永无止境。这从一个侧面说明
①真理最基本的属性是客观性                   ②认识具有无限性  
③真理应随着历史条件的变化而丰富、发展、完善  ④真理具有条件性