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.frequentlyB.regularlyC.occasionallyD.scarcely
37.A.concernB.importanceC.valueD.conscience
38.A.keepB.stayC.spendD.remain
39.A.pickB.showC.setD.make
40.A.seriousB.permanentC.long-termD.short-term
41.A.ifB.soC.a(chǎn)ndD.but
42.A.sameB.similarC.familiarD.due
43.A.excuseB.causeC.reasonD.result
44.A.fixB.drawC.payD.bring
45.A.illnessB.signsC.symptomsD.signals
46.A.collapseB.fadeC.returnD.restore
47.A.choicesB.contributionsC.effectsD.efforts
48.A.byB.a(chǎn)longC.withoutD.to
49.A.shortB.wideC.longD.quick
50.A.easilyB.severelyC.lightlyD.mentally
51.A.even ifB.a(chǎn)s ifC.what ifD.only if
52.A.foundB.researchedC.studiedD.examined
53.A.distantlyB.directlyC.differentlyD.immediately
54.A.HoweverB.ThereforeC.FurthermoreD.Otherwise
55.A.reduceB.decideC.explainD.understand

分析 文章講述了室內(nèi)污染源可能比室外的污染物對人體的傷害更大,但是還需要進一步的研究來找到最好的方法.

解答 36-40 CACBD  41-45 ABDCC  46-50 BDACB  51-55 AACBD
36.C考查副詞.室內(nèi)污染有時候是室外污染的2-3倍,"occasionally"意思是"偶爾"是室外污染的100倍.
37.A考查名詞.根據(jù)前句可知,室內(nèi)污染和嚴重,所以應(yīng)該是特別需要注意的"concern"意思是名詞,"在意關(guān)心的事情".
38.C考查動詞.前句說室內(nèi)污染要引起注意因為我們大部分的時間都是花在室內(nèi)的."spend"意思是"花費"符合題意.
39.B考查動詞.此處考查一個固定短語,"show up"意思是"出現(xiàn)".
40.D考查形容詞.前句提到"eyes,nose,throat and headaches"這些都是屬于"short-term"短期的影響.
41.A考查連接詞.if此處引導(dǎo)一個條件狀語產(chǎn)品從句,意思是"如果能夠鑒別污染源的話,治療很簡單".
42.B考查形容詞.根據(jù)"so it is often difficult to determine"有些很難決定,因為和"colds or other diseases"感冒很相似.
43.D考查名詞.如果這些癥狀是因為室內(nèi)污染源引起的結(jié)果的話就很難決定."result"意思是"結(jié)果"符合題意.
44.C考查動詞.所以要注意癥狀出現(xiàn)的時間和地點,此處考查一個固定短語"pay attention to"意思是"注意".
45.C 考查名詞.根據(jù)上文"so it is often difficult to determine if the symptoms"可知,此處填癥狀"symptoms"屬于原詞復(fù)現(xiàn).
46.B考查動詞.根據(jù)后面的"go away"可知所填的動詞應(yīng)該和"go away"有類似的意思,所以"fade"意思是消失.
47.D考查名詞.當一個人離開家,癥狀就消失了,回來癥狀就出現(xiàn)的話,應(yīng)該努力找一下室內(nèi)污染源,make efforts意思是努力.
48.A考查介詞."by"此處是介詞,意思是通過某種方式.
49.C考查形容詞.前句提到"years after exposure"可知,長時間的重復(fù)暴露在室內(nèi)污染物之下.
50.B 考查副詞. 根據(jù)句子里"some respiratory(呼吸的) diseases"一些呼吸疾病可能是最嚴重的,severly副詞來修形容詞fatal.
51.A考查介詞短語.根據(jù)上下文語境可知,即使沒有出現(xiàn)癥狀也要最好改善室內(nèi)空氣質(zhì)量."even if"意思是"即使"符合題意.
52.A考查動詞.此處found in indoor air 屬于過去分詞短語修飾pollutants,表示被動.
53.C考查副詞.根據(jù)上句"there is considerable uncertainty about"還不太確定暴露的什么階段會引起疾病,所以不同人對污染源的反應(yīng)也是不同的.
54.B考查連接詞.根據(jù)上下文的語境可知,此處therefore表示因果關(guān)系,因此,需要進一步的研究.
55.D考查動詞.由于前句提到還不太確定暴露的什么階段會引起疾病,所以更好理解室內(nèi)污染的 影響是有必要的.

點評 做好完形填空,考生必須進行通篇考慮,掌握大意,綜合所學(xué)詞法、句法和常識進行分析判斷.在進行有關(guān)邏輯語氣題時,必須要符合原文的意思,要瞻前顧后,審慎分析,細心推斷,密切注意相關(guān)連詞的連用,注意語氣的變化,應(yīng)從細節(jié)著手.

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