8．Outdoor air pollution is an obvious danger because it's hard to miss．Auto gases，industrial waste，city smog-everyone knows they're a health hazard（危险） and a call for solutions is on everyone's lips．But there's another threat just as perilous-a hidden threat（威胁） we are usually unaware of．We're speaking about the threat of indoor air pollution．
The dangers caused by indoor air pollution are too often underestimated（低估） and overlooked．According to a recent study，indoor air pollution can be many times higher than outdoor air pollution．A similar study by the Environmental Protection Agency shows that，in general，the air in our homes and offices is two to five times more polluted than outdoor air．
Scientific studies have found that indoor air pollution exacerbates（恶化） the symptoms of asthma（哮喘），and contributes to causing nausea（恶心），headaches and damage to the central nervous system．Evidence has even been found linking poor indoor air quality to certain cancers．Children who spend eighty percent of their time inside are particularly affected by indoor air pollution．
Cigarette smoke，chemical fertilizers，perfumes and clothing that has been dry-cleaned may contribute to indoor air pollution．Building materials-including paint and glue-are also contributors．
And homes aren't the only indoor areas affected by this danger．Offices are affected too-sometimes more so-with their copy machines and printers，inks and processing solutions （显影液）and so on．
Fortunately there are many ways to reduce indoor air pollution and improve indoor air quality in your home and office．A major first step would be the use of an air purifier（净化器）．
29．What does the underlined word"perilous"mean？B
A．Nervous．
B．Dangerous．
C．Obvious．
D．Similar．
30．The author mentions some studies in Paragraph 2to show indoor air pollutionD．
A．is recently overestimated
B．is linked to many serious diseases
C．has drawn people's attention
D．is very common and serious
31．Which of the following is the usual contributor of air pollution in our homes？A
A．Smoking．
B．Printing．
C．Copy machines．
D．Processing solutions．
32．What would be discussed in the paragraph that follows？B
A．Other dangers of indoor air pollution．
B．An introduction to the air purifier．
C．Other sources of indoor air pollution．
D．More solutions to the problem of air pollution．
分析 文章介绍了室外和室内空气污染的情况，并列举了主要的污染源，还提出了解决的办法．
解答 BDAB
29．B 猜测词意题．根据everyone knows they're a health hazard（危险）可知，前文提到了一个危险，再接合there's another threat可知，"perilous"即危险的 意思，故选B．
30．D 细节题．根据第二段开头The dangers caused by indoor air pollution are too often underestimated（低估） and overlooked．室内空气污染的危害经常必备忽视，接着举例子，目的是告诉我们室内污染也很常见和严重，故选D．
31．A 细节题．根据文章Cigarette smoke，chemical fertilizers，perfumes and clothing that has been dry-cleaned may contribute to indoor air pollution．得知，抽烟是室内污染的主要来源，故选A．
32．B 推理题．最后一段Fortunately there are many ways to reduce indoor air pollution…尤其是A major first step would be the use of an air purifier，所以接下来应该重点介绍关于 purifier，故选B．
点评 阅读理解题测试考生在阅读基础上的逻辑推理能力，要求考生根据文章所述事件的逻辑关系，对未说明的趋势或结局作出合理的推断；或根据作者所阐述的观点理论，对文章未涉及的现象、事例给以解释．考生首先要仔细阅读短文，完整了解信息，准确把握作者观点
