新一輪的英語(yǔ)六級(jí)考試就要考試了，快來(lái)做題吧。

 

　　六級(jí)完形填空練習(xí)（一）

 

　　For many people today, reading is no longer relaxation. To keep up their work they must read letters, reports, trade publications, interoffice communications, not to mention newspapers and magazines: a never-ending flood of words. In 1 a job or advancing in one, the ability to read and comprehend 2 can mean the difference between success and failure. Yet the unfortunate fact is that most of us are 3 readers. Most of us develop poor reading 4 at an early age, and never get over them. The main deficiency 5 in the actual stuff of language itself-words. Taken individually, words have 6 meaning until they are strung together into phrased, sentences and paragraphs. 7 , however, the untrained reader does not read groups of words. He laboriously reads one word at a time, often regressing to 8 words or passages. Regression, the tendency to look back over 9 you have just read, is a common bad habit in reading. Another habit which 10 down the speed of reading is vocalization—sounding each word either orally or mentally as 11 reads.

 

　　To overcome these bad habits, some reading clinics use a device called an 12 , which moves a bar (or curtain) down the page at a predetermined speed. The bar is set at a slightly faster rate 13 the reader finds comfortable, in order to “stretch” him.The accelerator forces the reader to read fast, 14 word-by-word reading, regression and subvocalization, practically impossible. At first 15 is sacrificed for speed. But when you learn to read ideas and concepts, you will not only read faster, 16 your comprehension will improve. Many people have found 17 reading skill drastically improved after some training. 18 Charlce Au, a business manager, for instance, his reading rate was a reasonably good 172 words a minute 19 the training, now it is an excellent 1,378 words a minute. He is delighted that how he can 20 a lot more reading material in a short period of time.

 

　　1. A.applying B.doing C.offering D.getting

 

　　2. A.quickly B.easily C.roughly D.decidedly

 

　　3. A.good B.curious C.poor D.urgent

 

　　4. A.training B.habits C.situations D.custom

 

　　5. A.lies B.combines C.touches D.involves

 

　　6. A.some B. A lot C.little D.dull

 

　　7. A.Fortunately B.In fact C.Logically D.Unfortunately

 

　　8. A.reuse B.reread C.rewrite D.recite

 

　　9. A.what B.which C.that D.if

 

　　10. A.scales B.cuts C.slows D.measures

 

　　11. A.some one B.one C.he D.reader

 

　　12. A.accelerator B.actor C.amplifier D.observer

 

　　13. A.then B.as C.beyond D.than

 

　　14. A.enabling B.leading C.making D.indicating

 

　　15. A.meaning B.comprehension C.gist D.regression

 

　　16. A.but B.nor C.or D.for

 

　　17. A.our B.your C.their D.sucha

 

　　18. A.Look at B.Take C.Make D. Consider

 

　　19. A.for B.in C.after D.before

 

　　20. A.master B.go over C.present D.get through

 

　　參考答案

 

　　1.D

 

　　【解析】本句意思是“誰(shuí)如果想謀得一份差事”。applying需加for,意思是“申請(qǐng)”;B.doing做;C.offering提供此三項(xiàng)均不符題意，　只有D.getting(獲得)適合。

 

　　2.A

 

　　【解析】本句意為“快速閱讀與理解的能力，是關(guān)系到成敗的關(guān)鍵所在”只有quickly與原意吻合。easily(容易地);roughly (粗略地);　decidedly(果斷地)均與原文內(nèi)容不符。

 

　　3.C

 

　　【解析】英語(yǔ)中，閱讀速度快的人稱(chēng)為good reader，反之，就是poor reader。根據(jù)上下文的內(nèi)容，多數(shù)人都屬于poor reader，因此選poor(差的)。其它選項(xiàng)不妥。

 

　　4.B

 

　　【解析】此處的意思是“大多數(shù)人早期養(yǎng)成看書(shū)慢的習(xí)慣”因此選habits(習(xí)慣)。training (訓(xùn)練，培訓(xùn));situations(形勢(shì));custom(風(fēng)俗習(xí)慣)。

 

　　5.A

 

　　【解析】此處說(shuō)的是“主要的困難在于語(yǔ)言的自身要素，即單詞”。combines聯(lián)合;touches接觸;involves包括，這三項(xiàng)的詞義與原文不符。而lies與in構(gòu)成搭配，意為“在于”。

 

　　6.C

 

　　【解析】這里的意思是“如果單個(gè)地看這些字，它們并沒(méi)有什么意義”。some有點(diǎn);A lot許多;dull單調(diào)的。此三項(xiàng)不合題意。只有l(wèi)ittle(很少)是否定詞，合乎邏輯。

 

　　7.D

 

　　【解析】此句意為“作者對(duì)未受過(guò)閱讀訓(xùn)練的人的不良習(xí)慣感到遺憾”。Fortunately幸運(yùn)地;In fact事實(shí)上;Logically合乎邏輯地,均不妥。Unfortunately(不幸地)合乎句義。

 

　　8.B

 

　　【解析】此句意為“在閱讀時(shí)經(jīng)常重讀(反復(fù)讀)”因此，選reread重讀。reuse再使用;Rewrite改寫(xiě);recite背誦。

 

　　9.A

 

　　【解析】此處所填的詞既是look back over的賓語(yǔ)，又是you have just read的賓語(yǔ)，只有what能充當(dāng)這種雙重成分。

 

　　10.C

 

　　【解析】scales down按比例減少;cuts down削減;此兩項(xiàng)不合題意。measures不能與down搭配。只有slow與down搭配的意思“放慢”，在此合適。

 

　　11.B

 

　　【解析】本段前文已經(jīng)出現(xiàn)you，在此選one(泛指人們，我們，你)來(lái)代替you。some one無(wú)此用法。如果用reader，前面應(yīng)加定冠詞。he不能與該段邏輯一致。

 

　　12.A

 

　　【解析】此句意為“訓(xùn)練快速閱讀所使用的工具必然與提高閱讀速度有關(guān)”，因此選accelerator (快讀器)。actor演員;amplifier放大器;observer觀察者。

 

　　13.D

 

　　【解析】前面的faster決定了應(yīng)當(dāng)選than，構(gòu)成比較級(jí)。

 

　　14.C

 

　　【解析】此句意為“快速閱讀器迫使你加快閱讀速度，使你再也不能逐字閱讀，回顧前文內(nèi)容或者默讀”。enabling相當(dāng)于making possible;leading引導(dǎo);indicating指出，表明。都不合題意。只有making (使，使得)最合適。

 

　　15.B

 

　　【解析】這里的意思是“速讀最初會(huì)影響理解”，所以選comprehension(理解力)。meaning意義，意思，指詞或詞組表示的意義;gist大意，要旨regression回顧

 

　　16.A

 

　　【解析】與前半句中的not only相呼應(yīng)，構(gòu)成句式“不僅……，而且……”，只有選but，而nor;or或for均不能構(gòu)成固定用法。

 

　　17.C

 

　　【解析】本句中的主語(yǔ)是第三人稱(chēng)復(fù)數(shù)，物主代詞必然是their。

 

　　18.B

 

　　【解析】take與后面的for instance構(gòu)成短語(yǔ)，意為：“以……例”，其它三項(xiàng)不能構(gòu)成搭配。

 

　　19.D

 

　　【解析】這里提到受訓(xùn)之前與受訓(xùn)之后進(jìn)行比較,對(duì)比，因此選before。

 

　　20.D

 

　　【解析】此處意為：在較短時(shí)間內(nèi)，讀完眾多的材料。master掌握;go over復(fù)習(xí);present呈現(xiàn)，展現(xiàn);此三項(xiàng)均不妥;只有g(shù)et through (讀完)最恰當(dāng)。

 

　　六級(jí)完形填空練習(xí)（二）

 

　　Who won the World Cup 1994 football game? What happened at the United Nations? How did the critics like the new play? 1 an event takes place; newspapers are on the streets 2 the details. Wherever anything happens in the world, reports are on the spot to 3 the news.

 

　　Newspapers have one basic 4 , to get the news as quickly as possible from its source, from those who make it to those who want to 5 it. Radio, telegraph, television, and 6 inventions brought competition for newspapers. So did the development of magazines and other means of communication. 7 , this competition merely spurred the newspapers on. They quickly made use of the newer and faster means of communication to improve the 8 and thus the efficiency of their own operations. Today more newspapers are 9 and read than ever before. Competition also led newspapers to branch out to many other fields. Besides keeping readers 10 of the latest news, today's newspapers 11 and influence readers about politics and other important and serious matters. Newspapers influence readers' economic choices 12 advertising. Most newspapers depend on advertising for their very 13 .Newspapers are sold at a price that 14 even a small fraction of the cost of production. The main 15 of income for most newspapers is commercial advertising. The 16 in selling advertising depends on a newspaper's value to advertisers. This 17 in terms of circulation. How many people read the newspaper? Circulation depends 18 on the work of the circulation department and on the services or entertainment 19 in a newspaper's pages. But for the most part, circulation depends on a newspaper's value to readers as a source of information 20 the community, city, country, state, nation, and world—and even outer space.

 

　　1.A.Just when B.While C.Soon after D.Before

 

　　2.A.to give B.giving C.given D.being given

 

　　3.A.gather B.spread C.carry D.bring

 

　　4.A.reason B.cause C.problem D.purpose

 

　　5.A.make B.publish C.know D.write

 

　　6.A.another B.other C.one another D.the other

 

　　7.A.However B.And C.Therefore D.So

 

　　8.A.value B.ratio C.rate D.speed

 

　　9.A.spread B.passed C.printed D.completed

 

　　10.A.inform B.be informed C.to be informed D.informed

 

　　11.A.entertain B.encourage C.educate D.edit

 

　　12.A.on B.through C.with D.of

 

　　13.A.forms B.existence C.contents D.purpose

 

　　14.A.tries to cover B.manages to cover C.fails to cover D.succeeds in

 

　　15.A.source B.origin C.course D.finance

 

　　16.A.way B.means C.chance D.success

 

　　17.A.measures B.measured C.Is measured D.was measured

 

　　18.A.somewhat B.little C.much D.something

 

　　19.A.offering B.offered C.which offered D.to be offered

 

　　20.A.by B.with C.at D.about

 

　　參考答案

 

　　1.【答案】A

 

　　【解析】just在此為副詞，意為“剛剛”，做狀語(yǔ)。此句意為“一個(gè)事件剛剛發(fā)生，街上就有報(bào)紙報(bào)道詳情了。說(shuō)明報(bào)紙對(duì)新聞的反應(yīng)之快。

 

　　2.【答案】A

 

　　【解析】to give和giving都合乎語(yǔ)法，但giving強(qiáng)調(diào)的是正在發(fā)生的動(dòng)作，而此處重點(diǎn)表達(dá)的是“反應(yīng)快”，不是正在做什么。

 

　　3.【答案】A

 

　　【解析】消息，信息要靠收集。

 

　　4.【答案】D

 

　　【解析】后面的不定式短語(yǔ)表示目的。

 

　　5.【答案】C

 

　　【解析】提供信息的目的是為了讓他人知道，所以選C。

 

　　6.【答案】B

 

　　【解析】other意為“其他的”。此句意為：無(wú)線電，電報(bào)，電視，及其它發(fā)明，成為報(bào)紙的競(jìng)爭(zhēng)對(duì)手。

 

　　7.【答案】A

 

　　【解析】根據(jù)句中的merely及其后所述內(nèi)容，應(yīng)選however，表轉(zhuǎn)折。

 

　　8.【答案】D

 

　　【解析】使用更新，更快的通訊工具，目的是提高速度。

 

　　9.【答案】C

 

　　【解析】報(bào)紙是印出來(lái)的，先印后看(讀)。

 

　　10.【答案】D

 

　　【解析】keep sb.+過(guò)去分詞是一種復(fù)合結(jié)構(gòu)，sb.與過(guò)去分詞為被動(dòng)關(guān)系，意為保持這種關(guān)系的繼續(xù)。此句的意思是：報(bào)紙不斷地為讀者提供新聞信息。

 

　　11.【答案】C

 

　　【解析】關(guān)于politics之類(lèi)的嚴(yán)肅話題,只能選educate。

 

　　12.【答案】B

 

　　【解析】此句意為：報(bào)紙通過(guò)廣告影響讀者在經(jīng)濟(jì)生活中的選擇。

 

　　13.【答案】B

 

　　【解析】大多數(shù)報(bào)紙依靠廣告收入來(lái)維持生存，此現(xiàn)象人人皆知。

 

　　14.【答案】C

 

　　【解析】報(bào)紙的售價(jià)之低，不足以抵付成本的一小部分。符合上下文關(guān)于廣告收入的說(shuō)法。

 

　　15.【答案】A

 

　　【解析】收入來(lái)源應(yīng)該用source。因?yàn)閟ource指河流，泉水的發(fā)源地;常指抽象事物的根源或來(lái)源以及資料，信息的出處或來(lái)源。origin起源，起因。指事物后來(lái)發(fā)生,發(fā)展變化的最初起點(diǎn),或指人的出身和血統(tǒng)。

 

　　16.【答案】D

 

　　【解析】succeed in為固定短語(yǔ)。此句意為：廣告業(yè)務(wù)的成功，取決于報(bào)紙?jiān)诳蛻?hù)(要打廣告的人)心中的價(jià)值。

 

　　17.【答案】C

 

　　【解析】根據(jù)上下文，此處應(yīng)該用一般現(xiàn)在時(shí)的被動(dòng)語(yǔ)態(tài)，此句意為：報(bào)紙?jiān)诳蛻?hù)心中的價(jià)值，是靠發(fā)行量衡量的。

 

　　18.【答案】C

 

　　【解析】該句意為：發(fā)行量的大小，很大程度上取決于發(fā)行部門(mén)的工作及報(bào)紙所提供的服務(wù)功能和娛樂(lè)功能。

 

　　19.【答案】B

 

　　【解析】offered作services和entertainment的定語(yǔ)。

 

　　20.【答案】D

 

　　【解析】information后面接介詞about，表示“關(guān)于”。

 

　　六級(jí)完形填空練習(xí)（三）

 

　　Most people would be (1) by the high quality of medicine available (2) to most Americans. There is a lot of specialization, a great deal of (3) to the individual, a (4) amount of advanced technical equipment, and (5) effort not to make mistakes because of the financial risk which doctors and hospitals must (2) in the courts if they (7) things badly.

 

　　But the Americans are in a mess. The problem is the way in (8) health care is organized and (9). (10) to public belief it is not just a free competition system. To the private system has been joined a large public system, because private care was simply not (11) the less fortunate and the elderly.

 

　　But even with this huge public part of the system, (12) this year will eat up 84.5 billion dollars——more than 10 per cent of the U.S. Budget—large numbers of Americans are left (13). These include about half the 11 million unemployed and those who fail to meet the strict limits (14) income fixed by a government trying to make savings where in can.

 

　　The basic problem, however, is that there is no central control (15) the health system. There is no (16) to what doctors and hospitals charge for their services, other than what the public is able to pay. The number of doctors has shot up and prices have climbed. When faced with toothache, a sick child, or a heart attack, all the unfortunate person concerned can do is (17) up.

 

　　Twothirds of the population (18) covered by medical insurance. Doctors charge as much as they want (19) that the insurance company will pay the bill.

 

　　The rising cost of medicine in the U.S.A. is among the most worrying problems facing the country. In 1981 the country’s health bill climbed 15.9 per cent——about twice as fast as prices (20) general.

 

　　1. [A] compressed [B] impressed [C] obsessed [D]. repressed

 

　　2. [A] available [B] attainable [C] achievable [D]. amenable

 

　　3. [A] extension [B] retention [C] attention [D]. exertion

 

　　4. [A] countless [B] titanic [C] broad [D] vast

 

　　5. [A] intensive [B] absorbed [C] intense [D] concentrated

 

　　6. [A] run into [B] come into [C] face [D] defy

 

　　7. [A] treat [B] deal [C] maneuver [D] handle

 

　　8. [A] which [B] that [C] what [D] when

 

　　9. [A] to finance [B] financed [C] the finance [D] to be financed

 

　　10. [A] Contrary [B] Opposed [C] Averse [D] Objected

 

　　11. [A] looking for[B] looking into [C] looking after [D] looking over

 

　　12. [A] which [B] what [C] that [D] it

 

　　13. [A] over [B] out [C] off [D] away

 

　　14. [A] for [B] in [C] with [D] on

 

　　15. [A] over [B] on [C] under [D] behind

 

　　16. [A] boundary [B] restriction [C] confinement [D] limit

 

　　17. [A] to pay [B] paying [C] pay [D] to have paid

 

　　18. [A] is being [B] are [C] have been [D] is

 

　　19. [A] knowing [B] to know [C] they know [D] known

 

　　20. [A] in [B] with [C] on [D] for

 

　　參考答案：

 

　　1. [B]解析：詞義辨析題。各個(gè)選項(xiàng)的意思和辨析如下：

 

　　compress 擠壓;壓縮。壓縮機(jī)就是compressor。近義詞squeeze。

 

　　impress 影響;給某人以深刻印象。名詞impression印象。形容詞impressive給人深刻印象的，感人的，出色的。

 

　　obsess迷住，使困擾。例如He was obsessed with the idea. 她一心想著那個(gè)念頭。

 

　　repress 壓制(感情等);鎮(zhèn)壓。

 

　　2. [A]解析：Something is available to someone：某人可以享受到……

 

　　例如：

 

　　Free education is available to all taxpayers.

 

　　所有納稅人都可以享受到免費(fèi)教育。

 

　　available 可以獲得的?，F(xiàn)成的。

 

　　attainable 雖然和available意思相近，但是沒(méi)有“現(xiàn)成的”之意。包含“需要努力才能得到的”意思。

 

　　achievable 的用法和attainable相近。也包含“需努力才能得到”的意思。

 

　　amenable 有責(zé)任的，需要負(fù)責(zé)的。應(yīng)該服從的，有服從義務(wù)的。

 

　　例如，citizens amenable to the law，應(yīng)該遵紀(jì)守法的公民。He was amenable to spending more time at home.他愿意在家多呆些時(shí)間。

 

　　3. [C]解析：extension 延長(zhǎng)，延續(xù);推遲。

 

　　retention保留，保持，保持物

 

　　attention注意, 關(guān)心, 關(guān)注, 注意力

 

　　exertion 盡力, 努力, 發(fā)揮, 行使, 運(yùn)用

 

　　4. [D]Vast amount of：大量的。

 

　　countless無(wú)數(shù)的。通常用于可數(shù)名詞。近義詞myriad, many。

 

　　titanic 巨大的。常形容體積。近義詞colossal

 

　　broad寬的，寬廣的

 

　　vast的用途比較廣泛?？梢杂脕?lái)形容體積，數(shù)量，程度，及強(qiáng)度。 近義詞enormous。比如：vast amounts of investment巨額的投資

 

　　5. [C]解析：intensive強(qiáng)烈的, 精深的, 透徹的。

 

　　Absorbed全神貫注的，一心一意的。

 

　　intense強(qiáng)烈的, 劇烈的, 熱切的, 熱情的, 激烈的

 

　　例如，the excitement was intense非常激動(dòng)intense pain劇烈的疼痛;intense colors，鮮明的顏色;intense effort巨大的努力;an intense student刻苦的學(xué)生

 

　　concentrated集中的，濃縮的。

 

　　6. [C]解析：Must后面用動(dòng)詞原形。To face = to be faced with：面對(duì)。

 

　　7. [D]解析：Handle = to deal with：處理。Treat: 給……治病，對(duì)待。Maneuver：有策略、有手腕地對(duì)待、處理。

 

　　8. [A]解析：Which引導(dǎo)的定語(yǔ)從句修飾the way。這里in which完全可以省略掉，變成：the way health care is organized…再比如：the way he treated his wife：他對(duì)待他妻子的方式 = the way in which he treated his wife。

 

　　9. [B]解析：Finance在這里是動(dòng)詞。和organize是并列關(guān)系，用其過(guò)去分詞。

 

　　10. [A]解析：Contrary to…和……相反。

 

　　Opposed to 和……反對(duì)，敵對(duì)，作對(duì)。

 

　　Averse (常與to連用)嫌惡的

 

　　I am not averse to a dance party and a good meal after a week’s hard work.

 

　　我不反對(duì)一周緊張的工作后舉辦一次舞會(huì),再美餐一頓。

 

　　The minister is averse to flattery.

 

　　部長(zhǎng)不喜歡聽(tīng)恭維話。

 

　　Object 不及物動(dòng)詞。反對(duì)(某人或某事)。例如：

 

　　I object to all this noise.

 

　　我反對(duì)一切噪音。

 

　　However, others strongly object to developing private cars.

 

　　然而,另有一些人強(qiáng)烈反對(duì)發(fā)展私人小汽車(chē)。

 

　　He stood up and objected in strong language.

 

　　他站起來(lái)用強(qiáng)烈的語(yǔ)言表示反對(duì)。

 

　　11. [C]解析：looking for 尋找

 

　　looking into 調(diào)查

 

　　looking after 照顧;照看

 

　　looking over 檢查，察看

 

　　12. [A]解析：Which引導(dǎo)一個(gè)非限定性定語(yǔ)從句，修飾名詞this huge public part of the system。非限定性定語(yǔ)從句不能用that修飾。

 

　　13. [B]解析：To leave someone/something out：省略，忽略，不考慮。

 

　　The entire Chapter II was left out in the second edition.

 

　　再版的時(shí)候整個(gè)的第二章都被刪掉了。

 

　　To leave over：留下，剩下。

 

　　questions left over by history歷史遺留下來(lái)的問(wèn)題

 

　　14. [D]解析：There’s no limit on…：……是沒(méi)有限度的。

 

　　There’s no limit on the potential of the human brain.

 

　　人大腦的潛力是無(wú)限的。

 

　　15. [A]解析：和control搭配的介詞是over。

 

　　16. [D]解析：boundary界線;邊界。例如，the boundaries of the country ，國(guó)界。界限;范圍。例如：the boundaries of knowledge 知識(shí)范圍。

 

　　Restriction限制。例如：restrictions for hunters對(duì)獵人實(shí)施的限制。a restriction against smoking in schools 禁止在學(xué)校吸煙 。

 

　　confinement (被)限制, (被)禁閉, 產(chǎn)期, 分娩。近義詞imprisonment

 

　　limit, restrict, confine這三個(gè)動(dòng)詞的一般含義為“限制”或“局限”。

 

　　limit 指時(shí)、空、程度、量等方面的“限定”，其內(nèi)涵是如果超出了這種限度就會(huì)受罰或遭到令人不快的后果;此外，這個(gè)詞也常用來(lái)表示“局限” This driver received a ticket because he failed to limit his speed while driving in heavy traffic.

 

　　那位司機(jī)收到了一個(gè)違章通知單，因?yàn)樗谲?chē)輛多的地方?jīng)]能限制開(kāi)車(chē)速度。

 

　　I limited myself to two modest ambitions. to do physical exercises every morning and to read more of an evening.

 

　　我把自己的決心限制于兩項(xiàng)小小的抱負(fù)：即每天早晨做體操，常在晚上多讀一點(diǎn)書(shū)。

 

　　He seems to have only a limited intelligence.

 

　　似乎他的智力有限。 We must limit our expense to what we can afford.

 

　　我們必須不使開(kāi)支超出我們的支付能力

 

　　restrict 區(qū)別于limit 的地方在于，restrict“限制”的是范圍，而limit 側(cè)重于表示“限制”到某個(gè)點(diǎn)

 

　　In democratic countries any efforts to restrict the freedom of the Press are rightly condemned.

 

　　在民主的國(guó)家里，限制新聞自由的任何努力都要受到公正的遣責(zé)。

 

　　The trees restrict our view.

 

　　這些樹(shù)局限了我們的視野。

 

　　confine 具有 limit 和 restrict 兩者的含義，但 confine 的內(nèi)涵是“約束”或“束縛”

 

　　He is confined to the house by illness.

 

　　他因病閉門(mén)不出。

 

　　The professor confined his remarks to scientific management.

 

　　那位教授把自己的講話局限在科學(xué)管理方面。

 

　　limit 亦為名詞。如：Didn’t you see the speed limit? confine 亦可用作名詞

 

　　It did not, however, remain within the confines of his estate.

 

　　然而，這種疾病并未被局限在他的莊園范圍之內(nèi)。

 

　　17. [C]解析：省略to的不定式作表語(yǔ)。

 

　　As I had created the embarrassing situation, I knew the kindest thing I could do was walk away.

 

　　因?yàn)槭俏以斐闪四莻€(gè)尷尬的局面，我知道我所能做的最好的事就是遠(yuǎn)遠(yuǎn)走開(kāi)。

 

　　18. [B]解析：主語(yǔ)是復(fù)數(shù)名詞，謂語(yǔ)動(dòng)詞應(yīng)用復(fù)數(shù)形式。另外因?yàn)槭且话闶聦?shí)，用一般現(xiàn)在時(shí)。

 

　　19. [A]解析：knowing that…現(xiàn)在分詞作狀語(yǔ)。

 

　　20. [A]解析：in general：總的來(lái)說(shuō)。