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1、3.3 课时作业 .用括号内所给动词的适当形式填空1With the help of high technology, more and more new substances _ (discover) in the past 50 years.2The construction of the new bridge _ (complete) by now.3She _ (laugh) at by her classmates since she was young.4Every possible means _ (try) to save the wild animals up to now.
2、5How many suggestions _ (give) to you so far?6The plans _ (study) by the experts for four times.7This is the second time that he _ (praise) by his teachers this week.8Much of its traditional folk culture _ (keep) alive ever since it was born.9A lot _ (do) in the recovery of national economy in the p
3、ast few years.10Students are told to make sure that the windows _ (close) before leaving the classroom.答案：1.have been discovered2.has been completed3has been laughed4.has been tried5have been given6.have been studied7has been praised8.has been kept9has been done10.have been closed.将下列句子改为被动语态1They h
4、ave put the computer into a robot._2We have finished the work now._3He has given the child some interesting books._4Have they returned the book yet?_5Over time, people have changed me a lot._6A new virus has attacked my computer._7I have made him study hard._8Have you found ways to make waste water
5、clean?_答案：1The computer has been put into a robot by them.2The work has been finished by us now.3The child has been given some interesting books by him./Some interesting books have been given to the child by him.4Has the book been returned by them yet?5Over time, I have been changed a lot by people.
6、6My computer has been attacked by a new virus.7He has been made to study hard by me.8Have ways been found to make waste water clean (by you)?.完成句子1这个贼已经被逮住了。The thief _.2这些狗受了虐待。The dogs _ badly.3他的作业已经完成。His homework _ already _.4他发生了糟糕的事情。Something bad _ to him.5王先生已经把我介绍给了史密斯先生。_ to Mr. Smith by
7、Mr. Wang.6在我们国家熊猫已经得到保护了吗？_ pandas _ in our country?7谁已经得到了这种新计算机的帮助？Who _ by the new computer?8汤姆已经买了什么东西？What _ by Tom?答案：1.has been caught2.have been treated3has; been finished4.has happened5I have been introduced6.Have; been protected7have been helped8.has been bought.阅读理解The most frightening wo
8、rds in the English language are, “Our computer is down.” You hear it more and more as you go about trying to conduct your business.The other day I was at the airport attempting to buy a ticket to Washington and the attendant said, “Im sorry; I cant sell you a ticket. Our computer is down.”“What do y
9、ou mean your computer is down? Is it depressed？”“No, it cant be depressed. Thats why its down.”“So if your computer is down, just write me out a ticket.”“I cant write you out a ticket. The computer is the only one allowed to do so.”I looked down on the computer and every passenger was just standing
10、there drinking coffee and staring at the black screen. Then I asked her, “What do all you people do？”“We give the computer the information about your trip, and then it tells us whether you can fly with us or not.”“So when it goes down, you go down with it.”“Thats good, sir.”“How long will the comput
11、er be down？” I wanted to know.“I have no idea. Sometimes its down for 10 minutes, sometimes for two hours. Theres no way we can find out without asking the computer, and since its down, it wont answer us.”After the girl told me they had no backup (备用) computer, I said, “Lets forget the computer. Wha
12、t about your planes? Theyre still flying, arent they？”“I couldnt tell without asking the computer.”“Maybe I could just go to the gate and ask the pilot if hes flying to Washington，” I suggested.“I wouldnt know what gate to send you to. Even if the pilot was going to Washington, he couldnt take you i
13、f you didnt have a ticket.”“Is there any other airline flying to Washington within the next few hours？”“I wouldnt know，” she said, pointing at the dark screen. “Only IT knows. IT cant tell me.”By this time there were quite a few people standing in lines. The word soon spread to other travellers that the computer was down. Some people went white, some people started to c
