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    7．Dogs are known for their sense of smell．They can find missing people and things like bombs and illegal drugs．Now a study suggests that the animal known as man's best friend can even find
    bladder（膀胱）cancer．
    Cancer cells are thought to produce chemicals with unusual odors（气味）．Researchers think dogs have the ability to smell these odors，even in very small amounts，in urine（尿）．The sense of smell in dogs is thousands of times better than in humans．
    The study follows reports of cases where，for example，a dog showed great interest in a growth on the leg of its owner．The man was later found to be skin cancer．
    Carolyn Willis led a team of researchers at Amersham Hospital in England．They trained different kinds of dogs for the experiment．The study involved urine collected from bladder cancer patients，from people with other diseases and from healthy people．
    Each dog was tested 8times．In each test there were 7samples for the dogs to smell．The dog should signal the one from a bladder cancer patient by lying down next to it．Two cocker（一种猎犬）dogs were correct 56percent of the time．But the scientists reported an average success rate of 41percent．
    The British Medical Journal published the research．In all，36bladder cancer patients and 108other people took part．During training，all the dogs reportedly even identified（认出）a cancer in a person who had tested healthy before the study．Doctors found a growth on the person's right kidney（肾）．
    Carolyn Willis says dogs could help scientists identify the combined chemicals produced by bladder cancer．That information could then be used to develop machines to test for the chemicals．The team also plans to use dogs to help identify markers for other kinds of cancer．
    24．What's the general idea of the text？C
    A．Dogs have a good sense of smell    
     B．Dogs can help cure cancer
    C．Dogs can smell cancer             
    D．Dogs help perform experiments
    25．According to the text，people who suffer bladder cancerA
    A．often have urine with unusual smell  
     B．probably smoke cigarettes in their life
    C．can easily make dogs lie down       
    D．are likely to die within nine years
    26．The underlined word"involved"in the text is closest in meaning toB．
    A．showed  
    B．used       
    C．proved   
    D．preferred
    27．What can we conclude from the last paragraph？D
    A．Dogs can only smell bladder cancer．
    B．Dogs have a good knowledge of cancer．
    C．Cancer doesn't have any sign in the beginning．
    D．Scientists might invent some equipment to test cancer．

    分析 本文是一篇科教类阅读，属于说明文，狗以闻闻闻名．他们可以找到失踪的人物和物品，如炸弹和非法药物．现在一项研究表明，被称为男人最好的朋友的动物甚至可以找到膀胱（膀胱）癌症．本文以此展开，主要介绍了狗可以闻出膀胱癌的一项研究．

    解答 24．C．主旨大意题．阅读全文，根据文章内容，尤其是Now a study suggests that the animal known as man's best friend can even find bladder（膀胱）cancer．可知，本文主要介绍了狗可以闻出膀胱癌的一项研究．故选C．
    25．A．细节理解题．根据Cancer cells are thought to produce chemicals with unusual odors（气味）．可知，膀胱癌症病人的尿液有着不同的味道．故选A．
    26．B．词义猜测题．根据The study involved urine collected from bladder cancer patients，from people with other diseases and from healthy people．可知，句意为该研究涉及膀胱癌患者，其他疾病患者和健康人群的尿液．故involved意为涉及，用到．故选B．
    27．D．段落大意题．根据Carolyn Willis says dogs could help scientists identify the combined chemicals produced by bladder cancer．That information could then be used to develop machines to test for the chemicals．The team also plans to use dogs to help identify markers for other kinds of cancer．可知，科学家可能会发明一些设备来检测癌症．故选D．

    点评 本文是一篇科教类阅读，题目涉及多道细节理解题，主旨大意题．做题时学生应仔细阅读原文，把握文章主要内容，联系文章上下文内容并结合所给选项含义，从中选出正确答案，一定要做到有理有据，切忌胡乱猜测．

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