Question

4．People know that outdoor air pollution can damage their health，but many don't realize that indoor air pollution can also have significant health effects．Studies indicate that indoor levels of pollutants may be 2～5 times，and（36）Cmore than 100 times，higher than outdoor levels．These levels of indoor air pollutants may be of particular（37）Abecause most people（38）Cabout 90%of their time indoors．
   Immediate effects （39）Bup after a single exposure or repeated exposures．These include irritation（刺激） of the eyes，nose，throat and headaches．Such immediate effects are usually （40）Dand treatable．Sometimes the treatment is simply eliminating the person's exposure to the source of the pollution，（41）Ait can be identified．Symptoms of some diseases may also show up soon after exposure to some indoor air pollutants．
   Certain immediate effects are（42）Bto those from colds or other diseases，so it is often difficult to determine if the symptoms are a（n）（43）Dof exposure to indoor air pollution．For this reason，it is important to（44）Cattention to the time and place the （45）Coccur．If the symptoms（46）Bor go away when a person is away from the home and return when the person returns，（47）Dshould be made to identify indoor air sources that may be possible causes．Some effects may be made worse （48）Aan inadequate supply of outdoor air or from the heating，cooling，or humidity conditions in the home．
   Other health effects may show up either years after exposure has occurred or only after（49）C repeated periods of exposure．These effects，which include some respiratory（呼吸的） diseases，can be（50）Bfatal．It is better to try to improve the indoor air quality in your home（51）A symptoms are not noticeable．
 While pollutants commonly（52）Ain indoor air are responsible for many harmful effects，there is considerable uncertainty about what periods of exposure are necessary to produce specific health problems．People also react very （53）Cto exposure to indoor air pollutants．（54）B，further research is needed to better（55）Dthe effects of indoor air pollution to find efficient ways to protect our health．

36．A．frequently	B．regularly	C．occasionally	D．scarcely
37．A．concern	B．importance	C．value	D．conscience
38．A．keep	B．stay	C．spend	D．remain
39．A．pick	B．show	C．set	D．make
40．A．serious	B．permanent	C．long-term	D．short-term
41．A．if	B．so	C．and	D．but
42．A．same	B．similar	C．familiar	D．due
43．A．excuse	B．cause	C．reason	D．result
44．A．fix	B．draw	C．pay	D．bring
45．A．illness	B．signs	C．symptoms	D．signals
46．A．collapse	B．fade	C．return	D．restore
47．A．choices	B．contributions	C．effects	D．efforts
48．A．by	B．along	C．without	D．to
49．A．short	B．wide	C．long	D．quick
50．A．easily	B．severely	C．lightly	D．mentally
51．A．even if	B．as if	C．what if	D．only if
52．A．found	B．researched	C．studied	D．examined
53．A．distantly	B．directly	C．differently	D．immediately
54．A．However	B．Therefore	C．Furthermore	D．Otherwise
55．A．reduce	B．decide	C．explain	D．understand

Answer 1

分析 文章讲述了室内污染源可能比室外的污染物对人体的伤害更大，但是还需要进一步的研究来找到最好的方法．

解答 36-40 CACBD  41-45 ABDCC  46-50 BDACB  51-55 AACBD
36．C考查副词．室内污染有时候是室外污染的2-3倍，"occasionally"意思是"偶尔"是室外污染的100倍．
37．A考查名词．根据前句可知，室内污染和严重，所以应该是特别需要注意的"concern"意思是名词，"在意关心的事情"．
38．C考查动词．前句说室内污染要引起注意因为我们大部分的时间都是花在室内的．"spend"意思是"花费"符合题意．
39．B考查动词．此处考查一个固定短语，"show up"意思是"出现"．
40．D考查形容词．前句提到"eyes，nose，throat and headaches"这些都是属于"short-term"短期的影响．
41．A考查连接词．if此处引导一个条件状语产品从句，意思是"如果能够鉴别污染源的话，治疗很简单"．
42．B考查形容词．根据"so it is often difficult to determine"有些很难决定，因为和"colds or other diseases"感冒很相似．
43．D考查名词．如果这些症状是因为室内污染源引起的结果的话就很难决定．"result"意思是"结果"符合题意．
44．C考查动词．所以要注意症状出现的时间和地点，此处考查一个固定短语"pay attention to"意思是"注意"．
45．C 考查名词．根据上文"so it is often difficult to determine if the symptoms"可知，此处填症状"symptoms"属于原词复现．
46．B考查动词．根据后面的"go away"可知所填的动词应该和"go away"有类似的意思，所以"fade"意思是消失．
47．D考查名词．当一个人离开家，症状就消失了，回来症状就出现的话，应该努力找一下室内污染源，make efforts意思是努力．
48．A考查介词．"by"此处是介词，意思是通过某种方式．
49．C考查形容词．前句提到"years after exposure"可知，长时间的重复暴露在室内污染物之下．
50．B 考查副词． 根据句子里"some respiratory（呼吸的） diseases"一些呼吸疾病可能是最严重的，severly副词来修形容词fatal．
51．A考查介词短语．根据上下文语境可知，即使没有出现症状也要最好改善室内空气质量．"even if"意思是"即使"符合题意．
52．A考查动词．此处found in indoor air 属于过去分词短语修饰pollutants，表示被动．
53．C考查副词．根据上句"there is considerable uncertainty about"还不太确定暴露的什么阶段会引起疾病，所以不同人对污染源的反应也是不同的．
54．B考查连接词．根据上下文的语境可知，此处therefore表示因果关系，因此，需要进一步的研究．
55．D考查动词．由于前句提到还不太确定暴露的什么阶段会引起疾病，所以更好理解室内污染的 影响是有必要的．

点评 做好完形填空，考生必须进行通篇考虑，掌握大意，综合所学词法、句法和常识进行分析判断．在进行有关逻辑语气题时，必须要符合原文的意思，要瞻前顾后，审慎分析，细心推断，密切注意相关连词的连用，注意语气的变化，应从细节着手．