【优化指导】（课标全国）高考英语总复习 课时作业20 北师大版.doc

【优化指导】（课标全国）高考英语总复习 课时作业20 北师大版一、阅读理解 a(2012河南九校联考)its a goal for millions and millions of families every yearkeep the christmas spending within a certain amount，but can still afford the gifts that your loved ones will enjoy.never has this concern been greater in recent years than right now.even so，there are several things that you can do to help.hit the sales.no one wants to get up at four oclock in the morning and fight to get the best deal on black friday，and its surely very tough to pick up the courage and get out there in the cold for a good deal，but sometimesit can be well worth.many retailers(零售商)offer specials all through the dayand some even offer online black friday specials，so you may still be able to get a great deal on black friday.pay close attention to advertisements.once the christmas shopping season is coming，retailers hungry for business will do just about whatever to get you in the store.pay very close attention to weekly advertisements of sales among the major retailers and you may be lucky enough to find different prices for the same thing in different shops.shop online.some of us dont like running from store to store in order to get the best price on the perfect gift，and some of us dont like to go out in the cold at allthankfully for us，we can do online shopping.the world of online shopping lets people visit all the major retailers as well as some specialty stores that could only be found on the internet.customers can find exactly what they are looking for，at the best possible price without ever having to leave the house.with traditional christmas shopping consumers are sometimes limited to whats left in stock if they wait too long to get to a particular store.1the first paragraph implies that_.anowadays not many people can afford expensive giftsbrecently many people dont want to spend money on giftscchristmas is a time to make our loved ones enjoy their giftsdchristmas is a time to make us feel free to buy our loved ones gifts 2in the writers opinion，it is rewarding on black friday_.aif the weather is not very coldbif we dont have to fight for the best dealscif we dont have to get up earlydif we get what we want at a good price3we can have more choices_.aon black fridaybin a particular storecon the internet dfrom retailersbin the rush to get to school，you drop a piece of toast on the floor.do you throw it away or decide its still ok to eat? if youre like most people，you eat it.maybe you follow the“5second rule”，which claims foods are safe to eat if you pick them up within 5 seconds from dropping them.but you might want to think again.scientists now say that 5 seconds are all it takes for foods to become contaminated(被污染的)with enough bacteria to make you sick.bacteria are singlecelled organisms that can cause many kinds of illnesses.some kinds of bacteria can grow on food.if we eat foods on which these bacteria are growing，we can become sick.common symptoms include vomiting(呕吐)and diarrhea(腹泻)one of these foodborne bacteria is salmonella(沙门氏菌)it makes 1.4 million people sick every year.earlier this year,370 people became sick after eating peanut butter that had been contaminated with salmonella at the manufacturing plant.salmonella are often found in raw eggs and chicken.cooking kills these bacteria，which is why it is so important to cook eggs，chicken，and other foods thoroughly.being a good housekeeper is a second tip for preventing infection.if household surfaces arent washed thoroughly，they can support salmonella for weeks.but how long does it take these bacteria to attach to food? to answer that question，a team of scientists at clemson university in south carolina decided to test the 5second rule，using sandwich ingredients.first，they placed a known amount of salmonella cells on three surfaces：wood，tile，and carpet.they placed a slice of bread and a slice of bologna on each surface for 5,30，or 60 seconds.after just 5 seconds，both the bread and bologna picked up enough bacteria to make you sick.so，forget the 5second rule.if your toast lands on the floor，toss it out.4what is“a 5second rule”？aif you drop food on the ground，you cant eat it unless you pick it up within five seconds.bif you drop food on the ground，you cant eat it unless you pick it up five seconds later.cif you drop food on the ground，you can eat it even you pick it up five seconds later.dif you drop food on the ground，you can eat it at any time after you pick it up.5according to the text，which of the following statements about bacteria is not correct?athey can cause many kinds of illnesses.bthey are singlecelled organisms.cthey can grow on the surface of food.dthey only can be found on food.6how can people avoid the infection of salmonella?anever eat peanut butter.bnever eat chicken and eggs.cnever eat food unless theyre cooked.dwash hands before dinner.7why did the scientists at clemson university make the experiment?abecause they wanted to see if salmonella cells can grow on such kind of food.bbecause they wanted to see whether the 5second rule is correct or not.cbecause they wanted to find out the best food among the three.dbecause they wanted to see whether bacteria can make one sick or not.二、短文填空根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。there is an english saying，“_1_”until recently，few people took the saying seriously.now，however，doctors have begun to look into laughter and the effects it has on the human body._2_tests were carried out to study the effects of laughter on the body.people watched funny films while doctors checked their hearts，blood pressure，breathing and muscles.it was found that laughter has similar effects to physical exercise._3_if laughter exercises the body，it must be beneficial.other tests have shown that laughter appears to be able to reduce the effect of pain on the body.in one experiment doctors produced pain in groups of students who listened to different radio programs.the group that tolerated(忍耐)the pain for the longest time was the group which listened to a funny program._4_5_they have found that even if their patients do not really feel like laughing，making them smile is enough to produce beneficial effects similar to those caused by laughter.alaughter can prolong ones life.bas a result of these discoveries，some doctors in the united states now hold laughter clinics in which they help to improve their patientscondition by encouraging them to laugh.cthe reason why laughter can reduce pain seems to be that it helps to produce a kind of chemicals in the brain which diminish both stress and pain.dit increases blood pressure，the heart beating and breathing；it also works several groups of muscles in the face，the stomach and even the feet.ealthough laughter helps cure the disease，doctors still can not put this theory into clinic practice.flaughter is the best medicine.gthey have found that laughter really can improve peoples health.1_2._3._4._5_三、短文改错假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的以下作文。文中共有10处语言错误，每句中最多有两处，每处错误仅涉及一个单词的增加、删除或修改。增加：在缺词处加一个漏字符号()，并在其下面写上该加的词。删除：把多余的词用斜线()划掉。修改：在错的词下划一横线，并在该词下面写出修改后的词。注意：1.每处错误及其修改均仅限一词；2只允许修改10处，多者(从第11处起)不计分。yesterday afternoon frank was told me about his experiences as a young man.frank is now the head of a very large business company.but when a boy he used to work in a small shop.it was his job to repair bicycles and at that times he used to work fourteen hours o