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考點29 原因狀語從句 高考頻度：★★★★★ 原因狀語從句是表示原因或理由的，引導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（它引導的不是從句）為并列連詞，語氣不如because強。 1. because引導的原因狀語從句 because表示人們不知道的直接的原因或理由，著重點在從句，其所引導的從句，為全句句意的中心所在。通常用于回答why引出的疑問句，語氣最強，除特別強調(diào)外，該從句一般位于主句后面。 I didn’t go abroad with her because I couldn’t afford it. 我沒有和她一起出國是因為費用太高。 Don’t scamp your work because you are pressed for time. 不要因為時間倉促而馬馬虎虎。 I wonder whether his hearing is okay _______________ he has turned the television up very loud. A. unless B. although C. until D. because 【答案】 D 2. as引導的原因狀語從句 as引導的原因狀語從句所引出的理由在說話人開來已經(jīng)很明顯，或已為聽話人所熟悉而不需要強調(diào)，從句多位于主句之前，通?？梢院蛃ince換用，as語氣稍弱。 As I didn’t know the way，I asked a policeman. 我不認識路，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 weren’t there, I left a message. A.As B.When C.Though D.For 【答案】 A 【解析】句意：因為你不在那兒，所以我給你留言了。此處應用as引導原因狀語從句，故選A。when引導時間狀語從句；though引導讓步狀語從句；for用作并列連詞表原因時不能位于句首。 2. When my father goes somewhere, he always goes along with my mother, _____________ he doesn’t like going alone. A.though B.as C.while D.even if 【答案】B 3. since引導的原因狀語從句 since表示人們已知的事實，不許強調(diào)的原因，故常譯為“既然……”，通常位于主句前。since從句是次要的，重點強調(diào)主句的內(nèi)容，相當于now that。 Since traveling by air is much faster, they decided to take a plane. 既然乘飛機旅行快得多，他們就決定坐飛機。 Since you won’t help me，I’ll ask someone else.你既然不幫我，那我就請別人幫忙。 Mark needs to learn Chinese ________his pany is opening a branch in Beijing. A. unless B. until C. although D. since 【答案】D　 【解析】考查狀語從句的連接詞。his pany is opening a branch in Beijing是學習漢語的原因。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：馬克需要學習漢語，因為他的公司要在北京開分公司。 4. now(that)引導的原因狀語從句 now(that)“因為；既然”，通?？梢院蛃ince換用。其中that可省去，用來表示一種新的情況，再加以推論。 Now(that) you’ve passed your test you can drive on your own.你既已考試合格，就可以獨自開車了。 I do remember，now (that) you mention it. 你這一提，我倒的確想起來了。 ________the term has e to an end, I am going to take a trip for relaxation. A. Now that B. Even if C.As though D. So that 【答案】A 5. seeing (that)引導的原因狀語從句 seeing (that)“鑒于；由于”，通常用于非正式文體。 Seeing (that) the weather is bad，we’ll stay at home.天氣不好，我們還是呆在家里吧。 6. in that引導的原因狀語從句 in that“因為；基于……的理由”，可以和because換用，多用于正式文體，它所引導的原因狀語從句總是位于主句之后。 Advertisement is distinguished from other forms of munication in that the advertiser pays for the message to be delivered. 廣告不同于其他交際形式，因為登廣告的人要為其所提供的信息付費。 I’m in a slightly awkward position, in that he’s not arriving until 10th. 我的處境有點難堪，因為他要十號才來。 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 that C. differs from; in what D. is different from; in where 【答案】B 【解析】考查動詞短語和連詞。表示“與……不同”可以用differ from…或be different from…；in that是固定連詞，引導原因狀語從句，表示“由于，因為”，故選B項。 題組一 能力過關(guān) I．單項填空 1.Perhaps it was_____________ my father often published his poems in the newspapers that he became known through his literary works. A. before B. when C. if D. because 2. _____________fewer people send letters to one another, the number of people collecting stamps has been steadily in decline. A. Before B. Although C.As D. If 3.Why not stay at home _____________the road is so slippery after the heavy snow? A. since that B. now that C. then that D. after that 4.________ you have got a job, you should learn to be independent of your parents. A. So B. Although C. Before D. Now that 5.The old man asked Lucy to move to another chair _____________he wanted to sit next to his wife. A. although B. unless C. because D. if 6. _____________ I can never persuade you to give up buying stocks(股票), I can only wish you good luck. A.When B.For C.Since D.Although 7. The play has remained a mystery ____________ the producer wants to surprise the audience. A.although B.because C.unless D.until 8. Mary felt sad over the loss of photos she had shot in Australia, ___________ that was a memory she especially treasured. A.as B.which C.when D.where 9. Enjoy the first hour of the day. This is very important ___________ it sets the mood for the rest of the day. A.as B.if C.when D.where 10. I won’t attend the party to be held in Mary’s home, ____________ I won’t stay where I feel I’m not weled. A.now that B.so that C.because D.when II.語法填空 閱讀下面短文，在空白處填入1個適當?shù)膯卧~或括號內(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 corns 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 countrys 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 2005—when the government ___8___ (start) a soil-testing program ___9___ gives specific fertilizer remendations 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. Chinas approach to protecting its environment while ___10___ (feed) its citizens "offers useful lessons for agriculture and food policymakers worldwide." says the banks Juergen Voegele. 題組二體驗真題 1. (2017新課標卷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. because 2.（2016北京卷單項填空）I really enjoy listening to music _______________ it helps me relax and takes my mind away from other cares of the day. A. because B. before C. unless D. until 題組一 能力過關(guān) 單項填空 1.D 【解析】分析句子結(jié)構(gòu)可知此處為強調(diào)句型，且被強調(diào)部分是原因狀語從句，故用because引導，其他選項不符合語境。 2.C 【解析】考查as引導的原因狀語從句。句意：因為越來越少的人互相寄信，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】考查狀語從句。據(jù)語境，你"既然"有了自己的工作，就應該獨立了。now that引導原因狀語從句，相當于since。 7. B 【解析】考查狀語從句。句意：這部戲劇仍舊是一個迷，因為創(chuàng)作者想給觀眾一個驚喜。A. although＂盡管＂引導讓步狀語從句；B. because＂因為＂引導原因狀語從句；C. unless＂除非＂引導條件狀語從句；D. until＂直到＂引導時間狀語從句。故選B。 8. A 【解析】考查狀語從句。句意：Mary因丟失了她在澳大利亞拍攝的照片而非常傷心，因為那是她格外珍貴的回憶。as意為＂因為＂，引導原因狀語從句。 9. A 【解析】考查狀語從句。句意：享受一天中的第一個小時。這很重要，因為這一個小時決定當天其余時間的情緒。＂as＂在句中引導原因狀語從句。 10. C 【解析】考查狀語從句。句意：我不會去參加在瑪麗家舉辦的派對，因為我不會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原因狀語從句，因此選C。 II.語法填空 【文章大意】本文是一篇說明文。文中講述了中國為保護環(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識的認可。 1. has grown 【解析】考查時態(tài)。since加時間點，主句要用現(xiàn)在完成時。句意：2011年以來，中國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)量在過去25年里增長了近125%，而大米只增長了7%。故是特指在過去的25年里。故填the。 4. to improve 【解析】考查非謂語動詞。句意：為了改善水質(zhì)政府鼓勵農(nóng)民種植玉米而不是大米。沒有連詞可以且謂語動詞是encourages，故improve應該用非謂語動詞。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)變減少了中國較大的湖泊和水庫的污染，使人們的飲用水更加安全。has decreased后跟名詞作賓語，故填pollution。 7. global 【解析】考查詞性轉(zhuǎn)換。句意：中國約占全球化肥總消費量的30%。fertilizer consumption是名詞短語，故應該用形容詞修飾。故填global。 8. started 【解析】考查謂語動詞。句意：在2005年政府開始了一項土壤測試項目。本句是when引導的定語從句，由于時間是2005年，故用過去時。故填started。 9. that/which 【解析】考查定語從句關(guān)系詞。根據(jù)空后的謂語動詞gives可知，該空缺少主語，指代program并且引導后面的句子。指物用that/which，故填that或者which。 10. feeding 【解析】考查省略句。句意：中國在養(yǎng)活了中國人民的同時又保護了環(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?？崭裉幈硎菊谶M行的動作，while后面省略掉了China is，省略句的原則：在時間狀語從句、條件狀語從句、，讓步狀語從句中，如果從句的主語和主句的主語一致且含有be動詞時，那么可以把主語和be動詞一塊省略。故填feeding。 題組二體驗真題