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13．For years scientists have been worried about the effects of air pollution on the earth's natural conditions．Some believe the air inside many houses may be more dangerous than the air outside．
Most scientists agree that every modern house has some kind of indoor pollution．People began to notice the problem in the early 1970s．When builders began making houses and offices，they did not want to waste energy．To do this they built buildings that limited the flow of air between inside and outside．They also used man-made building materials which are now known to let out harmful gases．
As the problem became more serious，scientists began searching for a way to deal with it．They discovered a natural pollution control system for building green plants．
Scientists believe that a plant's leaves absorb the pollutants （污染物）．In exchange the plant lets out oxygen through its leaves．Studies of different plants show that each absorbs different chemicals．So the most effective way to clean the air is to use different kinds of plants．
36．Indoor air pollution may be more dangerous than the air outside mainly becauseA．
A．the flow of air indoor is limited
B．the building are too high
C．people don't want to waste energy
D．the building materials are harmful
37．In the last paragraph the word"absorb"may meanC．
A．give out B．bring up
C．take in D．turn into
38．Scientists believe that plants canA．
A．absorb pollutions and let out oxygen
B．make your houses more prettier
C．absorb all the pollutants
D．change pollutants into oxygen
39．According to the last paragraph，we shouldBto clean the air．
A．plant all kinds of plant
B．have different kinds of plants
C．have the same kind of plant
D．plant more trees． 试题答案
分析 本文是一篇科教类阅读，文章关注的是室内空气污染问题．一些科学家认为，室内空气污染要比室外的空气污染更严重．室内空气污染会导致呼吸障碍、血液方面的疾病，甚至有致癌的危险．本文还说明室内空气污染的原因并提出了解决的方法，就是在家里种植绿色植物．
解答 ACAB
36．A细节理解题．根据第二段To do this they built buildings that limited the flow of air between inside and outside．They also used man-made building materials which are now known to let out harmful gases．可知为了达到这个目的，他们建造的建筑物抑制了室内和室外之间空气的流动．而且人工建筑材料会释放很多的有害气体．故选A．
37．C词义辨析题．根据最后一段Scientists believe that a plant's leaves absorb the pollutants （污染物）．和Studies of different plants show that each absorbs different chemicals．可知科学家们认为植物可以吸收污染物，而且研究表明不同的绿色植物能够吸收不同的污染的物质．由此可知，"absorb"的意思是"吸收"，即take in．故选C．
38．A细节判断题．根据最后一段Scientists believe that a plant's leaves absorb the pollutants （污染物）．In exchange the plant lets out oxygen through its leaves．可知科学家们认为植物可以吸收污染物，并将其转换成氧气释放到空气中．故选A．
39．B推理判断题．根据最后一段Studies of different plants show that each absorbs different chemicals．可知研究表明不同的绿色植物能够吸收不同的污染的物质．由此推知，我们应该种不同种类的植物来净化空气．故选B．
点评 本文讲述了室内空气污染的原因并提出了解决的方法，就是在家里种植绿色植物．本文考查细节题为主，细节题可以在文章中直接找到与答案有关的信息?或是其变体．搜查信息在阅读中非常重要它包括理解作者在叙述某事时使用的具体事实、数据、图表等细节信息．在一篇短文里大部分篇幅都属于这类围绕主体展开的细节．做这类题一般采用寻读法即先读题，然后带着问题快速阅读短文，找出与问题有关的词语或句子，再对相关部分进行分析对比，找出答案．
Actually，it’s not the years in your life_______count，but the life in your years．
A． what B． which
C． that D． when
