備戰(zhàn)2019年高考英語(yǔ) 考點(diǎn)一遍過(guò) 考點(diǎn)29 原因狀語(yǔ)從句（含解析）

考點(diǎn)29 原因狀語(yǔ)從句高考頻度：原因狀語(yǔ)從句是表示原因或理由的，引導(dǎo)這類從句的最常用的連詞是because, since, as , now that（既然）等，for 表示因果關(guān)系時(shí)（它引導(dǎo)的不是從句）為并列連詞，語(yǔ)氣不如because強(qiáng)。1. because引導(dǎo)的原因狀語(yǔ)從句 because表示人們不知道的直接的原因或理由，著重點(diǎn)在從句，其所引導(dǎo)的從句，為全句句意的中心所在。通常用于回答why引出的疑問句，語(yǔ)氣最強(qiáng)，除特別強(qiáng)調(diào)外，該從句一般位于主句后面。I didnt go abroad with her because I couldnt afford it.我沒有和她一起出國(guó)是因?yàn)橘M(fèi)用太高。Dont scamp your work because you are pressed for time.不要因?yàn)闀r(shí)間倉(cāng)促而馬馬虎虎。I wonder whether his hearing is okay _ he has turned the television up very loud.A. unlessB. althoughC. untilD. because【答案】 D2. as引導(dǎo)的原因狀語(yǔ)從句 as引導(dǎo)的原因狀語(yǔ)從句所引出的理由在說(shuō)話人開來(lái)已經(jīng)很明顯，或已為聽話人所熟悉而不需要強(qiáng)調(diào)，從句多位于主句之前，通?？梢院蛃ince換用，as語(yǔ)氣稍弱。As I didnt know the way，I asked a policeman.我不認(rèn)識(shí)路，因而問警察。As it is snowing, we shall not climb the mountain.由于在下雪，我們不去爬山了。1._ you werent there, I left a message.A.AsB.WhenC.ThoughD.For【答案】 A 【解析】句意：因?yàn)槟悴辉谀莾?，所以我給你留言了。此處應(yīng)用as引導(dǎo)原因狀語(yǔ)從句，故選A。when引導(dǎo)時(shí)間狀語(yǔ)從句；though引導(dǎo)讓步狀語(yǔ)從句；for用作并列連詞表原因時(shí)不能位于句首。2. When my father goes somewhere, he always goes along with my mother, _ he doesnt like going alone.A.thoughB.asC.whileD.even if【答案】B 3. since引導(dǎo)的原因狀語(yǔ)從句since表示人們已知的事實(shí)，不許強(qiáng)調(diào)的原因，故常譯為“既然”，通常位于主句前。since從句是次要的，重點(diǎn)強(qiáng)調(diào)主句的內(nèi)容，相當(dāng)于now that。Since traveling by air is much faster, they decided to take a plane.既然乘飛機(jī)旅行快得多，他們就決定坐飛機(jī)。Since you wont help me，Ill ask someone else.你既然不幫我，那我就請(qǐng)別人幫忙。Mark needs to learn Chinese _his company is opening a branch in Beijing.A. unless B. until C. although D. since【答案】D【解析】考查狀語(yǔ)從句的連接詞。his company is opening a branch in Beijing是學(xué)習(xí)漢語(yǔ)的原因。unless除非；until直到為止；although盡管；since由于，自從。在句中since是“由于”的意思。句意：馬克需要學(xué)習(xí)漢語(yǔ)，因?yàn)樗墓疽诒本╅_分公司。4. now(that)引導(dǎo)的原因狀語(yǔ)從句now(that)“因?yàn)?；既然”，通常可以和since換用。其中that可省去，用來(lái)表示一種新的情況，再加以推論。Now(that) youve passed your test you can drive on your own.你既已考試合格，就可以獨(dú)自開車了。I do remember，now (that) you mention it.你這一提，我倒的確想起來(lái)了。_the term has come to an end, I am going to take a trip for relaxation.A. Now that      B. Even ifC.As though     D. So that【答案】A5. seeing (that)引導(dǎo)的原因狀語(yǔ)從句seeing (that)“鑒于；由于”，通常用于非正式文體。Seeing (that) the weather is bad，well stay at home.天氣不好，我們還是呆在家里吧。6. in that引導(dǎo)的原因狀語(yǔ)從句in that“因?yàn)椋换诘睦碛伞?，可以和because換用，多用于正式文體，它所引導(dǎo)的原因狀語(yǔ)從句總是位于主句之后。Advertisement is distinguished from other forms of communication in that the advertiser pays for the message to be delivered. 廣告不同于其他交際形式，因?yàn)榈菑V告的人要為其所提供的信息付費(fèi)。Im in a slightly awkward position, in that hes not arriving until 10th.我的處境有點(diǎn)難堪，因?yàn)樗?hào)才來(lái)。 The Chinese language _Western languages _, instead of an alphabet, it uses characters which stand for ideas, objects or ideas.A. differs from; in which   B. is different from; in thatC. differs from; in what     D. is different from; in where【答案】B【解析】考查動(dòng)詞短語(yǔ)和連詞。表示“與不同”可以用differ from或be different from；in that是固定連詞，引導(dǎo)原因狀語(yǔ)從句，表示“由于，因?yàn)椤?，故選B項(xiàng)。題組一 能力過(guò)關(guān)I單項(xiàng)填空1.Perhaps it was_ my father often published his poems in the newspapers that he became known through his literary works.A. beforeB. whenC. ifD. because2. _fewer people send letters to one another, the number of people collecting stamps has been steadily in decline.A. BeforeB. AlthoughC.AsD. If3.Why not stay at home _the road is so slippery after the heavy snow?A. since thatB. now thatC. then thatD. after that4._ you have got a job, you should learn to be independent of your parents.A. SoB. AlthoughC. BeforeD. Now that5.The old man asked Lucy to move to another chair _he wanted to sit next to his wife.A. althoughB. unlessC. becauseD. if6. _ I can never persuade you to give up buying stocks(股票), I can only wish you good luck.A.WhenB.ForC.SinceD.Although7. The play has remained a mystery _ the producer wants to surprise the audience.A.althoughB.becauseC.unlessD.until8. Mary felt sad over the loss of photos she had shot in Australia, _ that was a memory she especially treasured.A.asB.whichC.whenD.where9. Enjoy the first hour of the day. This is very important _ it sets the mood for the rest of the day.A.asB.ifC.whenD.where10. I wont attend the party to be held in Marys home, _ I wont stay where I feel Im not welcomed.A.now thatB.so thatC.becauseD.whenII.語(yǔ)法填空閱讀下面短文，在空白處填入1個(gè)適當(dāng)?shù)膯卧~或括號(hào)內(nèi)單詞的正確形式。Diets have changed in China and so too has its top crop. Since 2011,the country _1_（grow）more corn than rice. Corn production has jumped nearly 125 percent over _2_ past 25 years, while rice has increased only 7 percent.A taste for meat is _3_ (actual) behind the change: An important part of its corn is used to feed chickens, pigs, and cattle. Another reason for corn's rise: The government encourages farmers to grow corn instead of rice _4_ (improve) water quality. Corn uses less water _5_ rice and creates less fertilizer(化肥) runoff. This switch has decreased _6_ (pollute) in the country's major lakes and reservoirs and made drinking water safer for people.According to the World Bank, China accounts for about 30 percent of total _7_ (globe)fertilizer consumption. The Chinese Ministry of Agriculture finds that between 2005when the government _8_ (start) a soil-testing program _9_ gives specific fertilizer recommendations to farmers - and 2011, fertilizer use dropped by 7.7 million tons. That prevented the emission(排放) of 51.8 million tons of carbon dioxide. China's approach to protecting its environment while _10_ (feed) its citizens "offers useful lessons for agriculture and food policymakers worldwide." says the bank's Juergen Voegele.題組二體驗(yàn)真題1. (2017·新課標(biāo)卷II改編)The damage is usually more serious on the first plant, but the neighbors, relatively speaking, stay safer _ they heard the alarm and knew what to do.A. though B. unless C. before D. because2.（2016·北京卷·單項(xiàng)填空）I really enjoy listening to music _ it helps me relax and takes my mind away from other cares of the day.A. becauseB. beforeC. unlessD. until題組一 能力過(guò)關(guān)單項(xiàng)填空1.D 【解析】分析句子結(jié)構(gòu)可知此處為強(qiáng)調(diào)句型，且被強(qiáng)調(diào)部分是原因狀語(yǔ)從句，故用because引導(dǎo)，其他選項(xiàng)不符合語(yǔ)境。2.C 【解析】考查as引導(dǎo)的原因狀語(yǔ)從句。句意：因?yàn)樵絹?lái)越少的人互相寄信，因此集郵的人數(shù)在持續(xù)減少。主句與從句之間有因果關(guān)系，因此用as。3.B 【解析】考查原因狀語(yǔ)從句連接詞。本題兩句話之間存在因果關(guān)系，故要用表示原因的now that。4.D 【解析】考查狀語(yǔ)從句。據(jù)語(yǔ)境，你"既然"有了自己的工作，就應(yīng)該獨(dú)立了。now that引導(dǎo)原因狀語(yǔ)從句，相當(dāng)于since。7. B 【解析】考查狀語(yǔ)從句。句意：這部戲劇仍舊是一個(gè)迷，因?yàn)閯?chuàng)作者想給觀眾一個(gè)驚喜。A. although盡管引導(dǎo)讓步狀語(yǔ)從句；B. because因?yàn)橐龑?dǎo)原因狀語(yǔ)從句；C. unless除非引導(dǎo)條件狀語(yǔ)從句；D. until直到引導(dǎo)時(shí)間狀語(yǔ)從句。故選B。8. A 【解析】考查狀語(yǔ)從句。句意：Mary因丟失了她在澳大利亞拍攝的照片而非常傷心，因?yàn)槟鞘撬裢庹滟F的回憶。as意為因?yàn)?，引?dǎo)原因狀語(yǔ)從句。9. A 【解析】考查狀語(yǔ)從句。句意：享受一天中的第一個(gè)小時(shí)。這很重要，因?yàn)檫@一個(gè)小時(shí)決定當(dāng)天其余時(shí)間的情緒。as在句中引導(dǎo)原因狀語(yǔ)從句。10. C 【解析】考查狀語(yǔ)從句。句意：我不會(huì)去參加在瑪麗家舉辦的派對(duì)，因?yàn)槲也粫?huì)待在我覺得自己不受歡迎的地方。根據(jù)句意和句子成分可以看出，本空需要從屬連詞引導(dǎo)原因狀語(yǔ)從句，因此選C。II.語(yǔ)法填空【文章大意】本文是一篇說(shuō)明文。文中講述了中國(guó)為保護(hù)環(huán)境在農(nóng)作物種植上做了一些變化并得到了世界上的知名認(rèn)識(shí)的認(rèn)可。1. has grown 【解析】考查時(shí)態(tài)。since加時(shí)間點(diǎn)，主句要用現(xiàn)在完成時(shí)。句意：2011年以來(lái)，中國(guó)種植的玉米比水稻多。故填has grown。2. the【解析】考查冠詞。句意：玉米產(chǎn)量在過(guò)去25年里增長(zhǎng)了近125%，而大米只增長(zhǎng)了7%。故是特指在過(guò)去的25年里。故填the。4. to improve 【解析】考查非謂語(yǔ)動(dòng)詞。句意：為了改善水質(zhì)政府鼓勵(lì)農(nóng)民種植玉米而不是大米。沒有連詞可以且謂語(yǔ)動(dòng)詞是encourages，故improve應(yīng)該用非謂語(yǔ)動(dòng)詞。此處表示目的，故用不定式。故填to improve。5. than【解析】考查連詞。句意：玉米比大米使用的水更少。根據(jù)關(guān)鍵詞less可知，填比較連詞。故填than。6. pollution【解析】考查詞性轉(zhuǎn)換。句意：這一轉(zhuǎn)變減少了中國(guó)較大的湖泊和水庫(kù)的污染，使人們的飲用水更加安全。has decreased后跟名詞作賓語(yǔ)，故填pollution。7. global【解析】考查詞性轉(zhuǎn)換。句意：中國(guó)約占全球化肥總消費(fèi)量的30%。fertilizer consumption是名詞短語(yǔ)，故應(yīng)該用形容詞修飾。故填global。8. started【解析】考查謂語(yǔ)動(dòng)詞。句意：在2005年政府開始了一項(xiàng)土壤測(cè)試項(xiàng)目。本句是when引導(dǎo)的定語(yǔ)從句，由于時(shí)間是2005年，故用過(guò)去時(shí)。故填started。9. that/which 【解析】考查定語(yǔ)從句關(guān)系詞。根據(jù)空后的謂語(yǔ)動(dòng)詞gives可知，該空缺少主語(yǔ)，指代program并且引導(dǎo)后面的句子。指物用that/which，故填that或者which。10. feeding【解析】考查省略句。句意：中國(guó)在養(yǎng)活了中國(guó)人民的同時(shí)又保護(hù)了環(huán)境。這一做法為全世界的農(nóng)業(yè)和糧食政策制定人提供了很有用的經(jīng)驗(yàn)?？崭裉幈硎菊谶M(jìn)行的動(dòng)作，while后面省略掉了China is，省略句的原則：在時(shí)間狀語(yǔ)從句、條件狀語(yǔ)從句、，讓步狀語(yǔ)從句中，如果從句的主語(yǔ)和主句的主語(yǔ)一致且含有be動(dòng)詞時(shí)，那么可以把主語(yǔ)和be動(dòng)詞一塊省略。故填feeding。題組二體驗(yàn)真題8