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（氣味）．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（一種獵犬）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（認(rèn)出）a cancer in a person who had tested healthy before the study．Doctors found a growth on the person's right kidney（腎）．
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．a(chǎn)re 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 本文是一篇科教類閱讀，屬于說(shuō)明文，狗以聞聞聞名．他們可以找到失蹤的人物和物品，如炸彈和非法藥物．現(xiàn)在一項(xiàng)研究表明，被稱為男人最好的朋友的動(dòng)物甚至可以找到膀胱（膀胱）癌癥．本文以此展開(kāi)，主要介紹了狗可以聞出膀胱癌的一項(xiàng)研究．

解答 24．C．主旨大意題．閱讀全文，根據(jù)文章內(nèi)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，本文主要介紹了狗可以聞出膀胱癌的一項(xiàng)研究．故選C．
25．A．細(xì)節(jié)理解題．根據(jù)Cancer cells are thought to produce chemicals with unusual odors（氣味）．可知，膀胱癌癥病人的尿液有著不同的味道．故選A．
26．B．詞義猜測(cè)題．根據(jù)The study involved urine collected from bladder cancer patients，from people with other diseases and from healthy people．可知，句意為該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意為涉及，用到．故選B．
27．D．段落大意題．根據(jù)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，科學(xué)家可能會(huì)發(fā)明一些設(shè)備來(lái)檢測(cè)癌癥．故選D．

點(diǎn)評(píng) 本文是一篇科教類閱讀，題目涉及多道細(xì)節(jié)理解題，主旨大意題．做題時(shí)學(xué)生應(yīng)仔細(xì)閱讀原文，把握文章主要內(nèi)容，聯(lián)系文章上下文內(nèi)容并結(jié)合所給選項(xiàng)含義，從中選出正確答案，一定要做到有理有據(jù)，切忌胡亂猜測(cè)．

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