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2014-5-11 0:24:24ÏÂÔر¾ÊÔ¾í

Unit 2¡¡¡¡No Smoking , please !

I. µ¥´Ê±æÒô£º

(¡¡¡¡)1. disappear¡¡¡¡A. compare¡¡¡¡¡¡B. wear¡¡¡¡¡¡C. beard¡¡¡¡¡¡ D. share

(¡¡¡¡)2. nation¡¡¡¡¡¡ A. magic¡¡¡¡¡¡¡¡B. male¡¡¡¡¡¡C. chance¡¡¡¡¡¡D. castle

(¡¡¡¡)3. compare¡¡¡¡ A. common¡¡¡¡¡¡B. company¡¡ C. computer¡¡  D. come

(¡¡¡¡)4. drug¡¡¡¡¡¡¡¡A. minute¡¡¡¡¡¡¡¡B. supply¡¡¡¡ C. ruler¡¡¡¡¡¡ D. hungry

(¡¡¡¡)5. permission¡¡ A. decision¡¡¡¡¡¡ B. discussion¡¡C. question¡¡¡¡D. suggestion

II. µ¥ÏîÑ¡Ôñ£º

¡¡1. Would you mind if I _______ the window .

¡¡¡¡A. open¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡B. opened¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡C. opening¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ D. will open

¡¡2. Do you know _______ the population of the city is ?

¡¡¡¡A. How ¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡B. which¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ C. what¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ D. how many

¡¡3. When we went back , our baby had _______ asleep .

¡¡¡¡A. got¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡B. gone¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ C. fallen¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡D. turned

¡¡4. The students in our school _______ part in the harvest years ago .

¡¡¡¡A. used to taking¡¡¡¡¡¡ B. used to take

¡¡¡¡C. were used to take¡¡¡¡D. were used to taking

¡¡5. He has no _______ of winning .

¡¡¡¡A. luck¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ B. occasion¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡C. opportunity¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡D. chance

¡¡6. Do you mind _______ me the book ?

¡¡¡¡A. you pass¡¡¡¡¡¡¡¡¡¡¡¡¡¡B. passing¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡C. to pass¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡D. pass

¡¡7. I wonder _______ I can ask you a personal question .

¡¡¡¡A. that¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡B. which¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ C. if¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡D. why

¡¡8. One third of the work _______ .

¡¡¡¡A. has been done¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ B. have been done

¡¡¡¡C. had done¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡D. has done

¡¡9. Most of his time is spent in class _______ .

¡¡¡¡A. to study¡¡¡¡¡¡¡¡¡¡¡¡¡¡ B. for study¡¡¡¡¡¡¡¡¡¡¡¡¡¡ C. studying¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡D. to studying

¡¡10. The government receives a lot of money _______ sales of wire every year , don¡¯t you know ?

¡¡¡¡A. from¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡B. for¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡C. of¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ D. at

¡¡11. I hope that the little _______ I¡¯ve been able to do has been of some use .

¡¡¡¡A. that¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡B. which¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ C. what¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ D. when

¡¡12. She kept on talking about her favorite book , _______ none of us had ever heard of .

¡¡¡¡A. what¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡B. which¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ C. where¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ D. whom

¡¡13. People who won¡¯t work _______ work .

¡¡¡¡A. must make ¡¡¡¡¡¡¡¡¡¡B. should be made¡¡¡¡¡¡C. must be made¡¡¡¡¡¡¡¡¡¡¡¡¡¡D. should be made to

¡¡14. Do you think more work always _______ more man .

¡¡¡¡A. call on¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡B. call at¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡C. call for¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡D. call up

¡¡15. He has _______ homework untouched .

¡¡¡¡A. got into the habit of leaving¡¡¡¡¡¡¡¡B. a habit to leave

¡¡¡¡C. got into the habit to leave¡¡¡¡¡¡¡¡  D. broken off the habit in leaving

¡¡16. She is taller than me _______ a head .

¡¡¡¡A. with¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ B. by¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ C. over¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡D. of

¡¡17. _______ is nothing but time .

¡¡¡¡A. All we need ¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ B. That we need

¡¡¡¡C. Which we need¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ D. What that we need

¡¡18. Poets often compare hearts _______ pumps .

¡¡¡¡A. with¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ B. to¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ C. about¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡D. for

¡¡19. Every year many people _______ drinking for much wine .

¡¡¡¡A. die by¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡B. die off¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ C. die of¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡D. die from

¡¡20. _______the sun , the earth is rather _______ .

¡¡¡¡A. Comparing with , small¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡B. Compared to , smaller

¡¡¡¡C. Compared with , small¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ D. Comparing to , smaller

III . µ¥´Êƴд£º

¡¡1. Without the teacher¡¯s p_______ , we dare not go out to play .

¡¡2. How can we r_______ silent on this question ?

¡¡3. Smokers are p_______ to give up smoking .

¡¡4. This is a shop that don¡¯t sell c_______ .

¡¡5. Burn these s_______ old clothes .

¡¡6. Can you see the d_______ between them ?

¡¡7. The five students s_______ a small room .

¡¡8. Give him a c_______ to start a new life .

¡¡9. He carried a large p_______ of books under his arm .

¡¡10. Parents should help their children to form good h_______ .

IV. ²¹È«¶Ô»°£º

¡¡¡¡(at a tailer shop)

¡¡¡¡A£ºI¡¯ve come to pick up my suit ____1____ .

¡¡¡¡B£º(looks at slip)B£­1234, Let me see . I¡¯m sorry it isn¡¯t ready yet .

¡¡¡¡A£º____2____ .

¡¡¡¡B£ºYes , so I see . But we¡¯re very busy these days , and sometimes we get behind a bit .

¡¡¡¡A£º____3____ Tim is important , you know . ____4____ .

¡¡¡¡B£ºI understand your feeling , but I¡¯m afraid there¡¯s nothing I can do about it . ____5____ I¡¯m sure it¡¯ll be ready then .

¡¡¡¡A£ºPeople can¡¯t come here every day .

¡¡¡¡B£ºYou really ought to do something about it .

¡¡¡¡C£ºHere¡¯s my slip .

¡¡¡¡D£ºCome again in three days .

¡¡¡¡E£ºBut it was supposed to be ready the day before yesterday .

¡¡¡¡F£ºPeople can¡¯t keep coming here every day .

¡¡¡¡G£ºBut it should be ready the day before yesterday .

V. ÔĶÁÀí½â£º

A

¡¡¡¡One day a few years ago a very funny thing happened to a neighbour of mine . He is a teacher at one of London¡¯s big medical schools . He had finished his teaching for his summer term and was at the airport on his way to Russia to give a lecture .

¡¡¡¡He had put a few clothes and his lecture notes in his shoulder bag , but he had put Rupert , the skeleton (ÈËÌå¹Ç¼Ü) to be used in his lecture , in a large brown suitcase . At the airport desk , he suddenly thought that he had forgotten to buy a newspaper . He left his suitcase near the desk and went over to the shop .

¡¡¡¡When he got back he discovered that someone had taken his suitcase by mistake . He often wonders what they said when they got home and found Rupert .

¡¡1. Who wrote the story ?

¡¡¡¡A. Ruper¡¯s teacher

¡¡¡¡B. The neighbour¡¯s teacher

¡¡¡¡C. A medical school teacher

¡¡¡¡D. The teacher¡¯s neighbour

¡¡2. Why did the teacher put a skeleton in his suitcase ?

¡¡¡¡A. He needed it for the summer term in London .

¡¡¡¡B. He needed it for the lecture he was going to give .

¡¡¡¡C. He wanted to take it to Russia for medical research .

¡¡¡¡D. He wanted to take it home as he finished his teaching .

¡¡3. What happened at the airport ?

¡¡¡¡A. The skeleton went missing .

¡¡¡¡B. The skeleton was stolen .

¡¡¡¡C. The teacher forgot his suitcase

¡¡¡¡D. The teacher took the wrong suitcase

¡¡4. Which of the following best tells the teacher¡¯s feeling about the incident ?

¡¡¡¡A. He is very angry .

¡¡¡¡B. He thinks it rather funny .

¡¡¡¡C. He feels helpless without Rupert .

¡¡¡¡D. He feels good without Rupert .

¡¡5. Which of the following might have happened afterwards (ºóÀ´)?

¡¡¡¡A. The teacher got back the suitcase but not Rupert .

¡¡¡¡B. The teacher got back neither the suitcase nor Rupert .

¡¡¡¡C. The teacher got back Rupert but not the suitcase .

¡¡¡¡D. The teacher got back both the suitcase and Rupert .

B

¡¡¡¡The vitamins (άÉúËØ) are named by letters of the alphabet . Vitamin A is needed by the eyes . These is Vitamin A in milk , butter and green vegetables . It can be stored by the body .

¡¡¡¡Vitamin B can¡¯t be stored . It must be supplied all the time by some of the food we eat . The skins of grain of all sorts have Vitamin B in them .

¡¡¡¡Vitamin C is very important to the body . Without it men¡¯s teeth become loose and their arms and legs weak . Lemons , oranges and tomatoes have Vitamin C in them .

¡¡¡¡Vitamin D is the sun vitamin . We get it in milk and eggs and from sunlight on our skin . There are other vitamins , but these A , B , C, D are the most important .

¡¡6. There are much Vitamin A and Vitamin D in ________ .

¡¡¡¡A. milk¡¡¡¡B. eggs¡¡¡¡C. vegetables¡¡¡¡D. sunlight

¡¡7. If someone stops eating , he will be in need of Vitamin ________first .

¡¡¡¡A. A¡¡¡¡B. B¡¡¡¡C. C¡¡¡¡D. D

¡¡8. Which of the following has much Vitamin B ?

¡¡¡¡A. Corn¡¡¡¡B. Meat¡¡¡¡C. Milk¡¡¡¡D. Apple

¡¡9. If you want to________ , you should get enough Vitamin C .

¡¡¡¡A. be clever¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ B. have a good memory

¡¡¡¡C. have good eyesight¡¡¡¡¡¡¡¡ D. be stronger

¡¡10. Among the following , who should take more food which has much Vitamin D in it ?

¡¡¡¡A. Soldiers¡¡¡¡B. Farmers¡¡¡¡C. Fishermen¡¡¡¡D. Officers

VI. ÍêÐÎÌî¿Õ£º

¡¡¡¡China is a large country with a ___1___of 12 billion . ___2___ about 38% of the Chinese population smoke . 89% of smokers ___3___ male . And China produces ___4___ of the world¡¯s cigarettes . Every year millions of smokers ___5___ illnesses ___6___ by smoking tobacco . ___7___ is known to all , smoking is harmful to ___8___ . Every year our govemment has to spend a lot of money ___9___ after people ___10___ illnesses which have been caused by ___11___ .

¡¡¡¡Smoking can also bring a great ___12___ to our country , ___13___ a cigarette end may ___14___ fire to houses and even to a ___15___ .

¡¡¡¡In Britain , one smoker ___16___ four will die from smoking every year . Since millions of smokers die from the ___17___ each year , the tobacco companies must not ___18___ new people to start smoking . But in fact , they do . This is only ___19___ they want to ___20___ in business .

¡¡1. A. population¡¡¡¡¡¡¡¡¡¡¡¡B. people¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ C. number¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ D. group

¡¡2. A. At once¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡B. At that time¡¡¡¡¡¡¡¡¡¡¡¡C. At present¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ D. At times

¡¡3. A. is¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡B. was¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡C. am¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡D. are

¡¡4. A. one¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡B. one third¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡C. one three¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ D. one thirds

¡¡5. A. fall¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡B. die¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡C. die of¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡D. die from

¡¡6. A. caught¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ B. led¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡C. got¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ D. caused

¡¡7. A. As¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ B. Which¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ C. That¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ D. It

¡¡8. A. health¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡B. safety¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡C. people¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ D. air

¡¡9. A. tending¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡B. watching¡¡¡¡¡¡¡¡¡¡¡¡¡¡ C. looking¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡D. seeing

¡¡10. A. with¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ B. of¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ C. from¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ D. in

¡¡11. A. smoking¡¡¡¡¡¡¡¡¡¡¡¡ B. illness¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡C. fire¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ D. hunger

¡¡12. A. good¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡B. change¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡C. loss¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡D. harm

¡¡13. A. for¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ B. and¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ C. but¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ D. however

¡¡14. A. catch¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ B. set¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡C. get¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡D. send

¡¡15. A. sea¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡B. farm¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ C. forest¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡D. desert

¡¡16. A. in¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡B. from¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ C. of¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ D. for

¡¡17. A. smoking¡¡¡¡¡¡¡¡¡¡¡¡ B. habit¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ C. tobacco¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ D. cigarettes

¡¡18. A. advise¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡B. ask¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ C. need¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ D. persuade

¡¡19. A. why¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ B. because¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ C. which¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡ D. the way

¡¡20. A. keep¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡B. continue¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡C. remain¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡D. stay

¡¾ÊÔÌâ´ð°¸¡¿

I.

¡¡1. C¡¡¡¡2. B¡¡¡¡3. C¡¡¡¡4. D¡¡¡¡5. B

II.

¡¡1. B¡¡¡¡2. C¡¡¡¡3. C¡¡¡¡4. B¡¡¡¡5. D

¡¡6. B¡¡¡¡7. C¡¡¡¡8. A¡¡¡¡9. C¡¡¡¡10. A

¡¡11. A¡¡12. B¡¡ 13. D¡¡¡¡14. C¡¡ 15. A

¡¡16. B¡¡17. A¡¡ 18. B¡¡¡¡19. D¡¡ 20. C

III.

¡¡1. permission¡¡¡¡2. remain¡¡¡¡¡¡3. persuaded

¡¡4. cigarettes¡¡¡¡ 5. smelly¡¡¡¡¡¡6. differences

¡¡7. share¡¡¡¡¡¡¡¡8. chance¡¡¡¡¡¡9. packet¡¡¡¡

¡¡10. habits

IV.

¡¡¡¡CEBFD

V.

¡¡1. D¡¡¡¡2. B¡¡¡¡3. A¡¡¡¡4. B¡¡¡¡5. B

¡¡6. A¡¡¡¡7. B¡¡¡¡8. A¡¡¡¡9. D¡¡¡¡10. D

VI.

¡¡1. A¡¡¡¡2. C¡¡¡¡3. D¡¡¡¡4. B¡¡¡¡5. C

¡¡6. D¡¡¡¡7. A¡¡¡¡8. A¡¡¡¡9. C¡¡ 10. A

¡¡11. A¡¡ 12. C¡¡ 13. A¡¡ 14. B¡¡15. C

¡¡16. A¡¡ 17. B¡¡ 18. D¡¡ 19. B¡¡20. C