Secondhand smoke isn’t just a health threat to people．It can also hurt dogs and cats，veterinarians say．
According to the Centers for Disease Control and Prevention，more than 126 million Americans who don't smoke are exposed to secondhand smoke in their homes，vehicles，workplaces，and public places．This exposure causes thousands of lung cancer and heart disease deaths among nonsmokers every year，according to the California Environmental Protection Agency．
“Making the leap from the effects of secondhand smoke on humans to their effects on pets isn't a big one,” says veterinarian （兽医专家） Carolynn MacAllister of Oklahoma State University．
“There have been a number of scientific papers recently that have reported the significant health threat secondhand smoke poses to pets,” MacAllister said．“Secondhand smoke has been associated with oral cancer and lymphoma in cats，lung and nasal cancer in dogs，as well as lung cancer in birds.”
Studies have also shown that dogs living in a smoking household are susceptible to cancers of the nose and sinus area，particularly if they are a long-nosed breed，because their noses have a greater surface area that is exposed to carcinogens and a greater area for them to accumulate．Dogs affected with nasal cancer normally don't survive for more than one year．
“Short and medium-nosed dogs are more susceptible to lung cancer，because their shorter nasal passage aren't as effective at accumulating the inhaled secondhand smoke carcinogens,” MacAllister said．“This results in more carcinogens （致癌物质） reaching the lungs.”
Birds are also at risk for lung cancer，as well as pneumonia，because their respiratory systems are hypersensitive to any type of air pollutant．
To help prevent animals from being adversely affected by smoking，pet owners who smoke should have a designated smoking area that is separated from the home or stop smoking altogether，MacAllister said．
【小题1】From the passage，we can see secondhand smoke maybe not harmful to ．A．smokersB．non-smokersC．petsD．trees【小题2】What can be suggested according to the passage?A．Smokers can smoke anywhere.B．Smokers can smoke at any time.C．Smokers should smoke in the designated place.D．Smokers must give up smoking at once.【小题3】What kind of dogs are likely to suffer from nasal cancer?A．Long-nosed dogsB．Short-nosed dogsC．Medium-nosed dogsD．Dogs without noses【小题4】The best title of the passage is .A．Secondhand Smoke Causes Cancer in PeopleB．Secondhand Smoke Causes Cancer in Birds C．Secondhand Smoke Causes Cancer in Pets D．Secondhand Smoke Causes Cancer in Cats【小题5】What is the meaning of the underlined phrase “are susceptible to”?A．are likely to be harmed by B．are hard to be influenced byC．are less to be effected byD．are lucky to be caught byD
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(答案→)D
解析：
【小题1】细节理解题。根据文章的第一段“Secondhand smoke isn't just a health threat to people．It can also hurt dogs and cats, veterinarians say．”可知二手烟的危害，但未提及树。
【小题2】推理判断题。ABD三个选项太绝对。C项是建议抽烟者在指定的地方吸烟。
【小题3】细节理解题。根据第五段可知长鼻子品种的狗易换这种癌症。
【小题4】主旨大意题。这篇文章以狗为例着重讲了二手烟对宠物的危害，
【小题5】词义猜测题。BC中的hard和less与文章不符。利用带入法A是正确的。