人教版高中英語必修5 Unit3復(fù)習(xí)課件

1、一、單詞識記一、單詞識記 1. _ n. 貨物貨物2. _ n. 周圍的事物周圍的事物3. _ n. 原料；材料原料；材料4. _ n. 生態(tài)；生態(tài)學(xué)生態(tài)；生態(tài)學(xué)5. _ n. 垃圾箱垃圾箱dustbin goodssurroundingsmaterialecology6. _ n. 運(yùn)輸工具；客車運(yùn)輸工具；客車7. _ vt. 系牢；扎牢系牢；扎牢8. _ vt. 回收利用；再利用回收利用；再利用9. _ vt. 吞下；咽下吞下；咽下10. _ adj. 貪吃的；貪婪的貪吃的；貪婪的greedy carriagefastenrecycleswallow11. _ adj. 樂觀主義的樂觀主義

2、的12. _ adj. 在前的在前的; 早先的早先的13. _ adv. 不斷地不斷地14. _ n. 指導(dǎo)指導(dǎo) vt. 指引指引; 指導(dǎo)指導(dǎo)15. _ n. 接受者接受者; 接收器接收器receiveroptimisticpreviousconstantlyguide二、單詞拓展二、單詞拓展 (A)單詞派生單詞派生 1. _v. 給人印象給人印象 _ adj. 印象深刻的印象深刻的 _ n. 印象印象; 感想感想; 印記印記impressimpressiveimpression2. _ v. 調(diào)整；調(diào)節(jié)調(diào)整；調(diào)節(jié) _ n. 調(diào)整；調(diào)節(jié)調(diào)整；調(diào)節(jié) _ adj. 可調(diào)節(jié)的可調(diào)節(jié)的adjustab

3、leadjustadjustment3. _ v. 打字；分類打字；分類 _ n. 打字機(jī)打字機(jī) _ n. 打字員打字員4. _ v. 按；壓按；壓 _ n. 壓力壓力pressuretypetypewritertypistpress5. _ adj. 不斷的不斷的 _ adv. 不斷地不斷地6. _ adj. 確定的確定的 _ adj. 不確定的不確定的uncertain constantconstantlycertain(B)靈活運(yùn)用靈活運(yùn)用 1. _ by green hill on the north and a clear river on the east, this villag

4、e really enjoys nice _. (surround)1. 第一空是被動第一空是被動, 即即“被包圍被包圍, 被圍繞被圍繞”故用過去分詞短語作狀語故用過去分詞短語作狀語; 第二空用名第二空用名詞作賓語。詞作賓語。Surroundedsurroundings2. He _ (constant) complained about the bad living conditions.2. 副詞修飾動詞。副詞修飾動詞。constantly3. -Whats your _ of your English teacher? -He is a kind and handsome young m

5、an, but what _ me most is his sense of humour. (impress)3. 在形容詞性物主代詞后用名詞在形容詞性物主代詞后用名詞; 第第二空用動詞作謂語二空用動詞作謂語,主語主語what是第三人是第三人稱單數(shù)。稱單數(shù)。 impression impresses4. It is _ that all students should wear the school uniform in school, but not all students obey the _. (require)4. 第一空第一空It is required that是固定句是固定句

6、式，表示式，表示“按要求按要求”；第二空用名詞；第二空用名詞作賓語。作賓語。 required requirement 5. The nurse _ the wound and the _ to the arm stopped the bleeding at last. (press)5. 第一空作謂語用動詞，由第一空作謂語用動詞，由stopped可可知用一般過去式；第二空作主語用名知用一般過去式；第二空作主語用名詞。詞。pressedpressure 三、短語翻譯三、短語翻譯 1. _拿起拿起; 接受接受; 開始開始; 繼續(xù)繼續(xù)2. _ (快捷而悄聲地快捷而悄聲地)移動移動3. _ 看不見看

7、不見4. _安全帶安全帶safety belt take upslide intolose sight of .5. _ 完全復(fù)原完全復(fù)原6. _ 打掃；橫掃打掃；橫掃7. _ 加速加速8. _ 與與相似相似be similar to be back on ones feetsweep upspeed up9. _向四面八方向四面八方10. _ 對對感到樂觀感到樂觀11. _ 似乎；好像似乎；好像12. _ 立刻；馬上立刻；馬上in no timein all directionsbe optimistic aboutas if四、課文回顧四、課文回顧 在空格處填入一個適當(dāng)在空格處填入一個適當(dāng)

8、的詞或使用括號中詞語的正確形式填空。的詞或使用括號中詞語的正確形式填空。 The passage is about a letter written by Li Qing who is taking up the prize that 1_ won last year. At first he was nervous and 2_(certain) about the journey. However，with Wang Pings guiding，Li Qing was transported into the future safely. he uncertain Hit by a lac

9、k 3_ fresh air，his head ached and he tried to make the necessary 4_ (adjust) to this new situation. Soon he was back 5_ his feet again 6_ flew after Wang Ping in a hovering carriage 7_ (drive)by computer. of adjustment on and driven Arriving at Wang Pings house，Li Qing was shown into 8_ large room w

10、ith a green wall made of trees，9_ leaves provided the room with oxygen. 10_ (exhaust), Li Qing slid into bed and fell fast asleep.a whose Exhausted 五、課文概要五、課文概要 以約以約30個詞概括課文個詞概括課文內(nèi)容要點(diǎn)。內(nèi)容要點(diǎn)。 In the spacemail， Li Qiang wrote to his parents about his first unforgettable experience of taking a “Future T

11、our” in a time capsule of 3008 AD.The tour was guided by Wang Ping.原句原句 I have to remind myself constantly that I am really in AD 3008. 我得不斷提醒自我得不斷提醒自己己, 我真的已經(jīng)進(jìn)入到我真的已經(jīng)進(jìn)入到3008年了。年了。(B5P17)1. remind vt. 提醒；使想起提醒；使想起例句例句 We must always remind ourselves of our weak points. 我們必須不斷提醒自己自我們必須不斷提醒自己自身的弱點(diǎn)。身的弱

12、點(diǎn)。remind sb. of sth./that.使使某人想起某事某人想起某事; 提醒提醒remind sb. to do sth. 提醒提醒某人做某事某人做某事運(yùn)用運(yùn)用The picture reminds me _ my college daysPlease remind me that I must call my mother up before nine.= Please remind me _ (call) my mother before nine. to call of 2. previous adj. 先前的；之前的先前的；之前的原句原句 .but it seems you

13、 keep getting flashbacks from your previous time period. 但在你腦子里似乎會不斷閃現(xiàn)但在你腦子里似乎會不斷閃現(xiàn)以前的時光。以前的時光。(B5P17)例句例句 He did better in his previous study.他在預(yù)習(xí)方他在預(yù)習(xí)方面做得好。面做得好。搭配搭配: previous to 在在之之前前(to是介詞是介詞)運(yùn)用運(yùn)用 根據(jù)漢語意思完成英語句子根據(jù)漢語意思完成英語句子。你以前有過這種工作經(jīng)驗(yàn)嗎你以前有過這種工作經(jīng)驗(yàn)嗎？Do you have _ of this kind of job?來這里之前來這里之前,我為你

14、準(zhǔn)備了文件我為你準(zhǔn)備了文件。_,I prepared all the documents for you.Previous to coming hereany previous experience原句原句 Hit by a lack of fresh air, my head ached. 由于缺乏新鮮空氣由于缺乏新鮮空氣, 我感到頭我感到頭痛痛。(B5P18)3. lack vi.缺少缺少; 缺乏缺乏 n. 缺少缺少; 缺乏缺乏; 短缺短缺的東西的東西例句例句 The plant died for a lack of water. 植物因缺水而枯死了植物因缺水而枯死了。搭配搭配lack s

15、th.缺乏某物缺乏某物(lack作作 vt.)lack of sth.缺乏某物缺乏某物(lack作作 n.)be lacking in缺乏缺乏(某種品質(zhì)、特點(diǎn)某種品質(zhì)、特點(diǎn)等等), 不夠不夠運(yùn)用運(yùn)用 因?yàn)槿卞X因?yàn)槿卞X, 他付不起上大學(xué)的學(xué)費(fèi)。他付不起上大學(xué)的學(xué)費(fèi)。Because he _(lack) money, he could not afford to go to the university= Because of _ (lack) of money, he could not afford to go to the universitylackeda lack(2) 你不能指望她你不

16、能指望她, 她缺乏責(zé)任她缺乏責(zé)任心。心。You can not depend on her for she is _ in responsibility.lacking4. impression n. 印；印記；印象??；印記；印象 原句原句 First impression (B5P17) 第一印象第一印象例句例句 Your performance gave me a strong impression. 你的表演給我留你的表演給我留下了很深的印象。下了很深的印象。搭配搭配have an impression of sth,/doing sth. 記得某事記得某事/做過某事做過某事make a

17、n impression on sb. 給某人留給某人留下印象下印象give sb. a favorable impression給某給某人以好印象人以好印象make no impression on 對對無影無影響響/效果效果運(yùn)用運(yùn)用 根據(jù)漢語意思完成英語句子根據(jù)漢語意思完成英語句子。(1)你對他的印象如何你對他的印象如何? (他給你的印象怎他給你的印象怎樣樣?)_.(2)我的話對他不起作用我的話對他不起作用。What I said _ _. made no impressionon himWhats your impression of him? 原句原句 What would you d

18、o if you found yourself alone on a desert island? 如果你發(fā)如果你發(fā)現(xiàn)你自己一個人在一座荒島上現(xiàn)你自己一個人在一座荒島上, 你會怎么辦？你會怎么辦？(B5P21)例句例句 Nobody likes to live in that desert region. 沒有人喜歡生活在那個沙漠地區(qū)。沒有人喜歡生活在那個沙漠地區(qū)。5. desert vt. 拋棄拋棄 adj. 廢棄的廢棄的 n. 沙漠沙漠運(yùn)用運(yùn)用The babys mother deserted him soon after giving birth. (詞性詞性_;詞義詞義 _ ) Aft

19、er the war, a lot of desert houses can be seen here and there.(詞性詞性_;詞義詞義_ )廢棄的廢棄的 vt.拋棄拋棄adj.The writer decided to live in the Sahara Desert for some time. (詞性詞性_;詞義詞義_)沙漠沙漠n.原句原句 I still cannot believe that I am taking up this prize that I won last year. 我現(xiàn)在仍然不能相信我是在去年獲得的我現(xiàn)在仍然不能相信我是在去年獲得的這個獎勵。這個獎勵

20、。(B5P17)例句例句 I am so proud to take up the prize. 能拿這個獎我很自豪。能拿這個獎我很自豪。6. take up 占據(jù)占據(jù)(時間，空間等時間，空間等); 對對感感興趣；開始從事；接受興趣；開始從事；接受運(yùn)用運(yùn)用 根據(jù)漢語意思完成英語句子。根據(jù)漢語意思完成英語句子。玩電腦游戲占用太多的時間玩電腦游戲占用太多的時間, 而且而且很無聊。很無聊。Playing computer games _ _ and its very boring.too much time takes up 為了保持健康為了保持健康, Johnson教授退休后教授退休后開始把騎自行

21、車當(dāng)作一種常規(guī)的運(yùn)動。開始把騎自行車當(dāng)作一種常規(guī)的運(yùn)動。To keep healthy, Professor Johnson _ as a regular form of exercise after he retiredtook up cycling 你打算接受這份工作嗎？你打算接受這份工作嗎？Are you going to_ ?盡管上學(xué)占據(jù)了她一天中大部分盡管上學(xué)占據(jù)了她一天中大部分時間，時間，Helen經(jīng)常幫她媽媽。經(jīng)常幫她媽媽。Helen always helps her mother even though going to school _ _ take up the job o

22、f her daytakes up most寫作句型仿寫寫作句型仿寫原句原句 No more typists working on a typewriter or computer. No more postage or postcodes!再也不需要打字再也不需要打字員在打字機(jī)或電腦上工作了！再也不員在打字機(jī)或電腦上工作了！再也不需要郵費(fèi)和郵政編碼了！需要郵費(fèi)和郵政編碼了！(B5P22)1. No more. ! No more .!再也沒有再也沒有/不不用用!再也沒有再也沒有/不用不用！例句例句 No more children playing here! No more noise an

23、noying us! 再也不會有小孩子在這里玩了再也不會有小孩子在這里玩了! 再再也不會有噪音吵到我們了！也不會有噪音吵到我們了！仿寫仿寫 根據(jù)漢語意思完成英語句子根據(jù)漢語意思完成英語句子。 再也沒有桌子出現(xiàn)在這兒再也沒有桌子出現(xiàn)在這兒! 也沒有椅也沒有椅子提供給我們子提供給我們！No more desks appearing here! _ _！ 再也沒有書要讀了再也沒有書要讀了, 再也沒有練習(xí)題再也沒有練習(xí)題要做了要做了！_ books to read! _ _ !more chairs provided to usNoNo moreNo moreexercises to do2. 疑問詞

24、疑問詞+do you think+其他其他 你你認(rèn)為認(rèn)為?原句原句 What problems do you think people in the future will have overcome? 你認(rèn)為未來的人你認(rèn)為未來的人們將克服什么問題們將克服什么問題? (B5P22)例句例句 Who do you think is the tallest in our class?你認(rèn)為我們班你認(rèn)為我們班誰最高誰最高?說明說明 除除think外外, believe, suppose, imagine, suggest, expect等也可用于此句型。等也可用于此句型。仿寫仿寫 根據(jù)漢語意思完成英

25、語句子根據(jù)漢語意思完成英語句子。你覺得我們什么時候見面好你覺得我們什么時候見面好?_for us to have a meeting?你認(rèn)為我們從事這項(xiàng)工作什么東西最你認(rèn)為我們從事這項(xiàng)工作什么東西最要緊要緊?_ when we take up the work?What do you believe matterswhen do you think is convenient3. When/ Until/ Though+ doing /done當(dāng)當(dāng)/直到直到/即使即使的時候的時候原句原句 This is similar to the “jet lag” you get when flying,

26、 這與你這與你在飛行過程中的時差反應(yīng)是相類似在飛行過程中的時差反應(yīng)是相類似的。的。(B5P18)例句例句 When crossing the road, the children are required to stop to look around and walk hand in hand.過馬路時過馬路時, 孩子們被要求停下孩子們被要求停下觀望再手牽手通過。觀望再手牽手通過。仿寫仿寫 根據(jù)漢語意思完成英語句子。根據(jù)漢語意思完成英語句子。(1)當(dāng)被問及廁所在哪里時當(dāng)被問及廁所在哪里時, 服務(wù)員非服務(wù)員非常有禮貌地給客人帶路。常有禮貌地給客人帶路。_, the waitress showed

27、 the way politely to the guest.When asked wheres the toilet(2)直至完成作業(yè)直至完成作業(yè), 小孩才允許看卡小孩才允許看卡通片。通片。_, the child was not allowed to watch the cartoon film. Until finishing the homework 原句原句 I lost sight of Wang Ping when we reached what looked like a large market because of too many carriages flying by

28、in all directions. 當(dāng)我們到達(dá)當(dāng)我們到達(dá)一個看上去像是大市場的地方時，由一個看上去像是大市場的地方時，由于太多車子朝四面八方飛奔，我看不于太多車子朝四面八方飛奔，我看不見王平了。見王平了。(P18 B5)分析分析 主句是主句是I lost sight of Wang Ping；when引導(dǎo)一個時間狀語從句，在這個引導(dǎo)一個時間狀語從句，在這個狀語從句中，狀語從句中，what引導(dǎo)一個引導(dǎo)一個_ 從從句，相當(dāng)于句，相當(dāng)于the place that；because of這個介詞短語表示原因，其中這個介詞短語表示原因，其中flying by in all directions是現(xiàn)在分

29、詞短是現(xiàn)在分詞短語作語作_語，修飾語，修飾carriages。定定賓語賓語1. 布朗太太布朗太太提醒提醒布朗先生吃藥。布朗先生吃藥。1. Mrs Brown reminded Mr Brown to take the medicine.2. 布朗太太問他吃藥了沒。布朗太太問他吃藥了沒。2. Mrs Brown asked him about it.3. 布朗先生告訴她他布朗先生告訴她他身體復(fù)原身體復(fù)原了。了。3. Mr. Brown told her that he was back on his feet.4. 他準(zhǔn)備把房子他準(zhǔn)備把房子打掃一遍打掃一遍。 4. He prepared to

30、sweep up the house.5. 他問她他問她: “你你覺得什么時候覺得什么時候打掃打掃好好?”5. He asked her “When do you think is a good time to clean the room?”6. 突然突然, 一只老鼠一只老鼠溜進(jìn)溜進(jìn)了他的臥室。了他的臥室。6. All of a sudden, a mouse slid into his bedroom.7. 他他操起掃把操起掃把想要打它想要打它, 它卻它卻加速加速跑了。跑了。7. When he took up the broom to strike it, the mouse sped

31、up and ran away.8. 很快他就很快他就看不見看不見這只老鼠了。這只老鼠了。 8. In no time, he lost sight of the mouse.合并：合并： Mrs Brown reminded Mr Brown to take the medicine. When asked, Mr Brown told her that he was back on his feet. He prepared to sweep up the house and asked what she thought of the idea. All of a sudden, a mo

32、use slid into his bedroom. When he took up the broom to strike it, the mouse sped up and ran away and in no time, he lost sight of the mouse.一、語法填空一、語法填空 The fast development of technology has made many changes in our daily life. For the students in a public high school in Philadelphia, the change i

33、s really great. Their so-called “The School of the Future” opened recently 1 _ the help of Microsoft Corp. 1. 固定搭配固定搭配, 根據(jù)后面的根據(jù)后面的the help of可知。可知。withThe combination of the 2 _ (late) technology and teaching methods makes it the focus in the world. It 3 _ (take) the School District of Philadelphia

34、$63 million 4 _ (build) the “one of the most advanced high schools”. 2. 根據(jù)句意可知。此處的根據(jù)句意可知。此處的latest意為意為“最新的最新的”。 3. 由上下文可知用一般過去時。由上下文可知用一般過去時。4. 不定式作主語。不定式作主語。 latesttookto build It is free 5 _ has no entrance exams. All the 170 students were picked by an open lottery from 1,500 applicants. 95% of th

35、e students are blacks and about 85% are 6 _ low-income families.5. 前后句意為并列關(guān)系前后句意為并列關(guān)系, 故填故填and。6. 與前面的與前面的be連用表示連用表示“來自來自”。 andfrom In the school, the students still sit in classrooms, 7 _ they work on their laptops. Instead of textbooks, their lessons rely mostly on information found on 8 _ Interne

36、t. 7. 前后句意為轉(zhuǎn)折關(guān)系前后句意為轉(zhuǎn)折關(guān)系, 故填故填but。8. 固定結(jié)構(gòu)。固定結(jié)構(gòu)。 buttheStudents can learn at their own steps. They do their homework on computers and send 9 _ to the teachers for marking. Parents can check their 10 _ (child) study on the Net at home.9. 指代前面的指代前面的homework。 10. 名詞所有格作定語。名詞所有格作定語。 itchildrens When Alic

37、e started to cycle home from Jennys house, she wasnt nervous. But halfway there, she began to wish that she hadnt been so 1 . Alices breath became puffs of white cloud and her 2 were so cold that it became hard to ride.1. A. brave B. excited C. curious D. stubborn1. A 前文說愛麗絲前文說愛麗絲wasnt nervous，后文出現(xiàn)轉(zhuǎn)

38、折。，后文出現(xiàn)轉(zhuǎn)折。brave與前面的與前面的wasnt nervous是詞語同現(xiàn)。是詞語同現(xiàn)。2. A. arms B. teeth C. hands D. legs 2. D 根據(jù)后面的根據(jù)后面的it became hard to ride以及常識以及常識(蹬車是蹬車是用腿用腿)可知?？芍?。二、完成填空二、完成填空 With her heart beating fast, she struggled so hard to move forward that she didnt hear the car which suddenly appeared beside her. She 3 by

39、 the road. The big black car also stopped. Slowly, the passenger-window began to 4 down. 3. A. fell B. stood C. stopped D. dropped3. C 這里的這里的stop與下一句的與下一句的stopped是原詞復(fù)現(xiàn)。是原詞復(fù)現(xiàn)。4. A. slide B. break C. set D. turn4. A 根據(jù)常識根據(jù)常識, 車窗應(yīng)該是滑車窗應(yīng)該是滑(slide)下來。下來。 Then, Alice was staring at a sweet, grey-haired ol

40、d lady. “Hello, dear,” said the old lady. “I need 5 . Im afraid Im lost. I need to find the nearest 6 . I must be there in the next five minutes.” I must be there in the next five minutes.” “Airport? You certainly are 7 ,” Alice said. 6. A. town B. airport C. station D. village5. A 后文后文old lady說她迷路了

41、說她迷路了,所以是需要所以是需要help。7. A. thirsty B. hungry C. mistaken D. lost6. B 與下段的與下段的Airport是原詞復(fù)現(xiàn)。是原詞復(fù)現(xiàn)。Im afraid Im lost. I need to find the nearest 6 . I must be there in the next five minutes.”“Airport? You certainly are 7 ,” Alice said. “You need to go back five kilometers until you reach the T-junction

42、. Turn left and 8 for about another 10 kilometers to the main highway. 7. A. thirsty B. hungry C. mistaken D. lost7. D 這里的這里的lost與前面的與前面的Im afraid Im lost中的中的lost是是原詞復(fù)現(xiàn)。原詞復(fù)現(xiàn)。8. A. drive B. walk C. follow D. march 8. A 老太太是開著車的老太太是開著車的, 所以是所以是drive。From there, just follow the 9 to the airport. But Im

43、 afraid theres no 10 youll get there in five minutes!”9. A. roads B. signs C. notices D. guidance9. B 只有選只有選sign (標(biāo)識標(biāo)識) 才說得通。因?yàn)檠赝静粫耪f得通。因?yàn)檠赝静粫兄笇?dǎo)。有指導(dǎo)。10. A. doubt B. room C. way D. time 10. C 由常識可知選由常識可知選way。若選。若選doubt, 表達(dá)的意表達(dá)的意思則恰好相反思則恰好相反, 故不能選。故不能選。 Slowly, the passenger-window began to 4 down. T

44、hen, Alice was staring at a sweet, grey-haired old lady. “Thank you very much, dear,” replied the old lady. “Dont 11 Ill make it in time.” The 12 moved up and the car started off. 11. A. stopB. hurry C. fear D. worry11. D 根據(jù)后面的根據(jù)后面的Ill make it in time可知老太太叫可知老太太叫Alice不必?fù)?dān)心。不必?fù)?dān)心。12. A. door B. window

45、C. headlight D. wheel12. B 這里的這里的window是前面出現(xiàn)的是前面出現(xiàn)的passenger-window的原詞復(fù)現(xiàn)。的原詞復(fù)現(xiàn)。 But then, something strange happened. The car began 13 . First, its 14 faded from black to silvery-grey. 13. A. disappearing B. running C. changing D. flying13. C 根據(jù)后面的描述可知是車子開始變了。根據(jù)后面的描述可知是車子開始變了。14. A. shape B. size C.

46、 color D. body 14. C color與后面的與后面的black 和和silvery-grey構(gòu)成上構(gòu)成上下義復(fù)現(xiàn)。下義復(fù)現(xiàn)。Then, the wheels began disappearing, but the car continued to move forward, 15 above the ground. As the car rose into the dark sky, it was gone in seconds, leaving Alice shaking her head in disbelief15. A. rolling B. floating C. d

47、rawing D. flashing15. B 由由above the ground可知可知, float與后面與后面的的rose詞語同現(xiàn)。詞語同現(xiàn)。round完成完成 disbelief不相信不相信 三、閱讀理解三、閱讀理解 A. Because they were the uniforms for air couriers.B. Because that made him easier to be recognized.C. Because his backpack had no room his clothes.D. Because he did not have any luggage

48、 with him1. Why was Brian wearing so many clothes for his travel?C 推理判斷題。由第一自然段中的推理判斷題。由第一自然段中的He was carrying one small backpack, which was very full.一句可知本題選一句可知本題選C。A .manages a business company in foreign countriesB. organizes international flights for touristsC. travels around the world with che

49、ap ticketsD delivers papers and packages to foreign countries.2. An air courier is a person who_.D 細(xì)節(jié)理解題。由第六自然段中的細(xì)節(jié)理解題。由第六自然段中的Air courier get cheap airline tickets because they take important packages and papers to foreign countries.一句可知一句可知本題選本題選D。 3. Businesses choose the air-courier service beca

50、use_.A. it costs less B. it is flexible C. it saves time D. it grows fastC 細(xì)節(jié)理解題。由倒數(shù)第二自然段的細(xì)節(jié)理解題。由倒數(shù)第二自然段的最后一句可知本題選最后一句可知本題選C。A. cannot decide when and where to travelB. cannot take any luggage with himC. has to wear two pairs of jeansD. saves little money from the travel4. One of the disadvantages of traveling as an air courier is that he_.A 推理判斷