（同步复习精讲辅导）北京市高中英语 Unit3 Computers（二)课后练习 新人教版必修2.doc

unit3 computers(二)课后练习题一：professor james will give us a lecture on the western culture, but when and where _ yet. a. hasnt been decided b. havent decided c. isnt being decided d. arent decided题二：i got caught in the rain and my suit _. a. has ruined b. had ruined c. has been ruined d. had been ruined题三：the school board is made up of parents who _ to make decisions about school affairs.a. had been electedb. had electedc. have been electedd. have elected题四：the window is dirty. i know. it _ for weeks. a. hasnt cleaned b. didnt clean c. wasnt cleaned d. hasnt been cleaned题五：the old man _ since he moved to the nursing home.a. has been taken good care of b. had not been taken care ofc. had not taken care of d. has taken care of题六：all the homework _ so far.a. has handed in b. had been handed in c. has been handed in d. had handed in题七：every year a flood of farmers arrive in shenzhen for the money-making jobs they _ before leaving their hometowns. a. promised b. were promised c. have promised d. have been promised题八：why does the lake smell terrible?because large quantities of water _.a. have polluted b. is being polluted c. has been polluted d. have been polluted题九：he is said _ abroad for further study, but i dont know which country he is studying in.a. to have gone b. to go c. going d. having gone题十：he is said _ writing the book, but we dont know when it will be published.a. to finish b. to have finished c. finishing d. having finished题十一：nobody knew when the fire , but they knew it the next morning. a. had broken out; was put out b. had been broken out; was put outc. had broken out; put out d. had been broken out; went out题十二：i was only told that nobody knew when the accident _.a. had occurred b. had been occurred c. was occurred d. has occurred 题十三：_ many times on the radio, the song is very familiar to me.a. being taught b. having taught c. have taught d. having been taught题十四：_ the sports meeting was put off, i have made a plan to travel abroad for my holiday.a. having been told b. having told c. being told d. i have been told题十五：i _ sooner but i didnt know that they were waiting for me.a. had come b. was coming c. would come d. would have come题十六： if you _ away our secret that day, the current situation_ different. sorry, but i _ to do that. a. didnt give; will be; didnt mean b. hadnt given; would be; didnt meanc. hadnt given; would have been; hadnt meant d. shouldnt give; is; dont mean 题十七：when i walked into the house after school, the first thing i noticed was a box with items i recognized from my dads office. when he told me that he was laid off, i thought he was joking. then i noticed his seriousness and realized he was telling the truth. my father has always been a hard worker. he has prided himself on his career. 1 i guess i had taken his work for granted. 2 for starters, he was home all the time. it meant my bed had to be made, my room cleaned up, and my homework done right after school. i would come home every day to find him at the computer searching for jobs. 3 he seemed down, though he tried to be optimistic. he asked my brother and me to spend less. i gave up my spending money, which wasnt much. i also found a part-time job. 4 he explained that he never wanted to be laid off again, so he was going to start his own business. day by day, i watched him build it. one evening i asked if he needed help. “only if it doesnt affect school, ” he said. i showed up at his office the next afternoon, and most afternoons after that for two months. 5 the terrible experience for our family taught me how to deal with difficulties. now i know that through creative problem-solving, i can always find plan b. i can ask for help and take risks. what i have learned from my dads understanding of business and his work ethic(信条) are two of the most important lessons i will ever learn. and they will be my principles for success.a. providing for our family has been his joy.b. i made every effort to solve his problems.c. i began to notice how losing his job had affected him.d. my fathers unemployment created many changes in our lives.e. after months of searching, my dad decided to go in a totally different direction.f. his courage and determination helped him to become successful in his new career.g. i always knew he was a hard worker，but watching him in action influenced me a lot.题十八：why cats scratch thingsit has long been assumed that when cats scratch objects with their front paws(爪子) they are sharpening their claws. 1 research on cat behavior suggests that the major reason for this behavior is communication. by scratching up the bark of a tree or the leg of your favorite chair, the cat is letting other cats or people know where she is and what she is up to.cats tend to pick a small number of noticeable objects in their environments to scratch such as trees, fence posts repeatedly. 2 the scratched surface leaves a highly visible mark that can be easily seen by other cats. in addition, cats have special glands(腺) in their paws so that when they make scratching movements they leave scent(气味) that other cats can smell. the fact that cats leave scent marks by making scratching movements may be the reason that cats will continue to scratch objects even after they have been declawed. 3 we dont know exactly what cats are communicating with their scratching. both males and females do it. it is done inside and outside the home and even by cats living with no other cats around. 4 cats dont scratch up your furniture to bother you or just to be destructive, but for specific reasons, one of which is communicating. cats also scratch to extend their bodies, during play, and possibly as a greeting or to relieve dissatisfaction when prevented from doing other things they want to do. 5 it is easier to prevent problem scratching rather than trying to change your cats preference for the arm of your sofa after it has become a built up habit. thus, the goal is to establish acceptable scratching habits by getting your cat to prefer a scratching post rather than the arm of your sofa.a. it turns out that this is only a secondary reason.b. this is why the tree next door looks so scratched up.c. cats use other parts of their bodies to communicate as well.d. small pieces of bark have accumulated on the ground underneath.e. scratching can result in considerable damage, owner dissatisfaction.f. declawed cats may still be leaving scent marks on objects they scratch.g. it could be a defensive warning or just a marker that announces its existence.unit3 computers(二)课后练习参考答案题一： a解析：本句意为：james教授将给我们做一个关于西方文化的讲座，但是何时何地还没有做出决定。此处表示到目前为止，所以要用现在完成时，而且何时何地和决定之间构成被动，所以要用现在完成时的被动语态。题二： c解析：本句意为：我淋雨了，西装毁了。后面的这个动作是前面这个动作产生的结果，而且my suit和ruin之间构成被动关系，所以要用现在完成时的被动语态。题三： c解析：本句意为：这个学校董事会是由已经当选并为学校事务做决定的父母组成的。父母是被选上，用被动语态，排除选项b和d。再根据关键信息is made up of用的是现在时，可知选举一事对现在有影响，所以用现在完成时。题四： d解析：本句意为：窗户脏了。我知道。好几周没有擦了。本题的时间状语是for weeks, 表示好几周，for加一段时间作时间状语，主句要用现在完成时，表示到目前为止的结果；窗户与擦之间是被动关系, 故用现在完成时被动语态。题五： a解析：本句意为：自从老人搬到养老院一直被照顾得很好。主句的主语the old man和动词词组take care of之间构成被动，所以要用被动语态，而且当由since引导的时间状语从句作状语的时候，主句中要用现在完成时，所以要用现在完成时的被动语态。 题六： c解析：本句意为：所有的作业到目前为止已经上交。so far到目前为止，主句中要用现在完成时，而且主语all the homework和动词hand in之间构成被动，所以要用现在完成时的被动语态。题七： d解析：本句意为：每年都有大批农民来到深圳，在离开家乡前，他们被许诺深圳有能赚钱的工作。首先从句意可以看出，这里是说他们离开家乡前别人许诺他们的工作，也就是他们被许诺的工作，所以要用被动。其次显然是在离家之前在家里已经被承诺，可知是完成，所以要用现在完成时的被动语态。题八： d解析：本句意为：为什么这个湖泊散发着难闻的味道？因为大量的水已经被污染。当large quantities of后面跟名词做主语的时候，谓语动词要根据quantity的单复数来确定谓语动词的单复数，所以此处可以排除bc；主语large quantities of water和pollute之间构成被动，所以要用被动语态，选d。题九： a解析：本句意为：据说他出国进修了，但是我不知道他在哪个国家学习。主语是人的时候，在be said后面要用不定式的某种形式，此处出国这个动作发生在主句的动作之前，所以要用不定式的完成形式。题十： b解析：本句意为：据说他已经写完了一本书，但是我们不知道这本书将何时出版。主语是人的时候，在be said后面要用不定式的某种形式，此处完成这个动作发生在主句的动作之前，所以要用不定式的完成形式。题十一： a解析：本句意为：没有人知道这场火灾什么时候爆发的，但是他们知道第二天早上火才被扑灭。break out是爆发的意思，没有被动语态。题十二： a解析：本句意为：我仅仅被告知没人知道事故发生在什么时候。occur是不及物动词，没有被动语态，主句的谓语动词是过去式，所以从句中要用过去完成时。题十三： d解析：本句意为：由于在收