13．People who are worried about bad breath often reach for a toothbrush or a gun．But in the future，personal breath monitoring may include far more than fresh breath．
In face，breath is so rich in chemical compounds that fully understanding it has proved challenging．Each breath contains gases like carbon dioxide，the volatile（揮發(fā)性的）remains of recent snacks，medicines and even compounds taken in from things like carpeting or various kinds of air pollution．But breath detectors（檢測(cè)器） can sort out these substances with increasing sensitivity（敏感性）．
Scientists are building electronic sniffers that examine the exhaled（呼氣）air for signs of cancer，asthma（哮喘），and other diseases．
"There are clear signatures in the breath for liver（肝）disease，kidney（腎）disease and heart disease．Breath is a rich mixture that can reflect out state of health and disease．"said Dr．Raed Dweik，director of the Cleveland Clinic，adding"Breath analysis is the future of medical testing．"
He and his partners are testing a desktop system called BreathLink for use in rapid identification of diseases．The system is designed to work wherever there is an Internet connection．To use BreathLink，a person breathes into a long tube，and a breath sample is collected and analyzed within the system．Then it can detail chemical concentrations（濃度）of the breath in graphics．Dr．Raed Dweik said，"If you examine patients of asthma，you will find they have higher levels of nitric oxide（一氧化碳） in their exhaled air．It reflects their abnormal symptoms in the lungs．"His tests have reached 85percent accuracy（精確度）so far in spotting people with some illness．
But some trained dogs，he pointed out，can sniff out cancer with 99percent accuracy-although without the ability to identify particular compounds the way some detectors can．
"We are getting better and better，"he said．"But whether we will ever approach the accuracy of the dog-we don't know．"
8．What is the breath detector used for？B
A．To find what kind of disease a person has．
B．To identify substances from people's breath．
C．To help a patient recover from disease．
D．To smell how bad the breath is．
9．In the fifth paragraph，what Dr．Raed Dwik said is meant toD．
A．show how he and his partners treated patients
B．tell why a person has asthma
C．show how sensitive the device is
D．show how to diagnose a patient of asthma
10．It can be inferred thatD
A．brushing teeth can improve one's bad breath
B．there are leftovers like snacks and medicines in one's breath
C．one can know exactly about his physical state through the breath
D．breath analysis can be helpful in medical diagnosis
11．What's the author's attitude towards the future of breath detectors？B
A．Indifferent B．Positive
C．Doubtful． D．Critical．
分析 本文是一篇科教類閱讀，屬于說明文，主要介紹了一項(xiàng)新發(fā)明：breath detectors，并通過舉例說明的方法告訴我們這項(xiàng)新的發(fā)明能夠幫助診斷疾�。�
解答 8．B 推理判斷題．根據(jù)第二段最后一句But breath detectors（檢測(cè)器） can sort out these substances with increasing sensitivity（敏感性）．可知這種呼吸檢測(cè)器可以把人呼出的氣體中的物質(zhì)進(jìn)行辨別分裂．故B正確．9．D 推理判斷題．根據(jù)第五段倒數(shù)第二句Dr．Raed Dweik said，"If you examine patients of asthma，you will find they have higher levels of nitric oxide（一氧化碳） in their exhaled air．It reflects their abnormal symptoms in the lungs．"aed Dweik以檢測(cè)患有哮喘為例說明人們使用這一設(shè)備診斷疾病的程序和方法．故D正確．
10．D 推理判斷題．根據(jù)文章第五段內(nèi)容以及最后一句His tests have reached 85 percent accuracy（精確度）so far in spotting people with some illness．可知這一設(shè)備可以通過分析人們所呼出的氣體中的成分來診斷人們所患疾病，而且準(zhǔn)確率達(dá)到百分之85．說明呼吸分析技術(shù)能夠幫助進(jìn)行醫(yī)學(xué)診斷．故D正確．
11．B．推理判斷題．"We are getting better and better，"he said．"But whether we will ever approach the accuracy of the dog-we don't know．"中we are getting better and better．說明作者對(duì)于這一設(shè)備的未來是持積極樂觀的態(tài)度的．故B正確．
點(diǎn)評(píng) 本文是一篇科教類閱讀，題目涉及多道推理判斷題．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)．
