单选题
Taking Showers" Can Make You III"

Showering may be bad for your health, say US scientists, who have shown that dirty shower heads can deliver a face full of harmful bacteria. Tests revealed nearly a third of devices harbour significant levels of Mycobacterium avium, a bug that causes lung disease. Levels of M. avium were 100 times higher in shower head than those found in typical household water supplies. M. avium forms a biofilm that clings to the inside of the shower head, repofls the National Academy of Science.
In the Proceedings journal, the study authors say their findings might explain why there have been more cases of these lung infections in recent years, linked with people tending to take more showers and fewer baths.
When the researchers swabbed and tested 50 shower heads from nine cities in seven different states in the US, including New York City and Denver, they found 30% of the devices posed a potential risk.
Lead researcher Professor Norman Pace, said:" If you are getting a face full of water when you first turn your shower on, that means you are probably getting a particularly high load of Mycobacterium avium, which may not be too healthy. "
While it is rarely a problem for most healthy people, those with weakened immune systems, like the elderly, pregnant women or those who are fighting off other diseases, can be susceptible to infection.
Water spurting from shower heads can distribute bacteria - filled droplets that suspend them selves in the air and can easily be inhaled into the deepest parts of the lungs, say the scientists from the University of Colorado at Boulder.
Since plastic shower heads appear to "load up" with more bacteria- rich biofilms, metal shower heads may be a good alternative, said Professor Pace.
Showers have also been identified as a route for spreading other infectious diseases, including a type of pneumonia called Legionnaires' disease and chest infections with a bacterium called Pseudomonas aeruginosa.
Hot tubs and spa pools carry a similar infection risk, according to the Health Protection Agency.

单选题 According to the first passage ,what is NOT right?
【正确答案】 C
【答案解析】定位的文章原句a third of devices harbour significant levels of Mycobacterium aviunl, a bug that causes lung disease. Levels of M. avium were 100 times higher in shower head than those found in typical household water supplies，(M.avium是一种可以引起肺病的细菌，三分之一的家用设施可以滋生数量巨大的M.avium。在淋浴头中发现的M.avium数量比在其他家庭水源中高100倍)。可见选项A，B，D均合文意，C认为M.avium不能在水中存活，是错误的，故选择C。
单选题 Why the shower can cause lung disease?
【正确答案】 C
【答案解析】定位到文章原句Water spurting from shower heads can distribute bacteria-filled drop lets that suspend themselves in the air and can easily be inhaled into the deepest parts of the lungs．(从淋浴头喷出来的水滴会在空中散布带有细菌的微粒，人们会很容易将这些微粒吸人体内)，可见选项C是符合文意的，故选择C。
单选题 Who are not susceptible to the shower water?
【正确答案】 A
【答案解析】定位到文章原句While it is rarely a problem for most healthy people, those with weakened immune systems, like the elderly，pregnant women or those who are fighting off other diseases， can be susceptible to infection．(对大多数健康人并不是问题，但对免疫系统很弱的人比如老年人，孕妇，或其他的疾病患者来说，就很容易感染)。可见选项A提到的青少年并不在范围内，故选择A。
单选题 How many cities have been covered in this study?
【正确答案】 C
【答案解析】the researchers tested 50 shower heads from nine cities in seven different states in the US，可见研究者在美国的7个洲9个城市中，测试了50个淋浴头，可见选项C是正确的。
单选题 What cannot be inferred from the passage?
【正确答案】 D
【答案解析】定位到文章原句metal shower heads may be a good alternative… Showers have also been identified as a route for spreading other infectious diseases，Hot tubs and spa pools carry a similar infection risk(金属的淋浴头会是一个好的选择，淋浴也被视为传播其他感染性疾病的途径，热汤浴和美容美体池也会有同样的感染隐患)。可见选项A，B，C都与文意是符合的，选项D认为健康人不应该经常洗淋浴是不合文意的。