1、选修七 Unit 3 Under the sea单元测试B时间：90分钟，满分：100分.单项填空(每小题1分，满分15分)从A、B、C、D四个选项中，选出可以填入空白处的最佳选项。1Mr. Smith is very kind and friendly_his students, but he is also very strict_them.Awith; toBto; withCto; to Dwith; with2Are you satisfied with the result?Not at all. It couldnt be_.Aany better Bany worseCso b
2、ad Dthe worst3I can still remember the sittingroom_my mother and I used to sit in the evening.Athat BwhichCwhere Dwherever4It is reported that the_of the fire in the bookstore was that the manager was too careless.Aexcuse BreasonCcause Dquestion5When you finish reading the book, youll have_better un
3、derstanding of_life.Aa; the Bthe; aC/; the Da; /6No matter what you say, I shall_my own position on this question.Ainsist on Bget on withCkeep up Dstick to7He tried many times to sneak across the boarder to a neighboring country, _each time.Ahaving been caught Bunluckily caughtCalways being caught D
4、only to be caught8Who would you rather_the office?Joyce, of course.Ahave cleaned Bget cleanedCget clean Dhave clean9Hi, havent seen you for ages! You look fine._. You look well, too.ANot at all BOh, noCGreat DThanks10The accused had many_to prove that he was not guilty.Ajudges BwitnessesClawyers Dpa
5、ssersby11I think you should phone Jenny and say sorry to her._. It was her fault.ANo way BNot possibleCNo chance DNot at all12He is the only person who saw the accident_. So he is the most important witness.Ahappen Bto happenChaving happened Dhappened13I often log on the website, because its_with mu
6、ch useful information.Apleased BpackedCburdened Dcovered14We had a picnic last term and it was full of fun, so lets have_one this month.Athe other BsomeCanother Dother15They_drinking although they are drivers.Agive up Bdevote themselves toCquit Dabandon themselves to.完形填空(共20小题；每小题1分，满分20分)阅读下面短文，理解
7、大意，从题中(120)所给的A、B、C、D四个选项中选出一个最佳答案。All water, even rain water, contains dissolved chemicals which scientists call“salts”. But not all water16salty. Water is fresh or salty according to17judgement, and in making this decision man is more18by his sense of taste than by a laboratory test. It is ones ta
8、ste buds that accept one water and19another.A simple experiment illustrates this. Fill three20with water from the kitchen faucet. Drink from one and it tastes fresh even though some dissolved salts are21present. Add a pinch of table salt to the second, and the water may taste fresh or slightly22depe
9、nding on a personal taste threshold and on the23of salt held in a“pinch”. But add a teaspoon of salt24the third and your taste buds vehemently protest that this water is too salty to drink; this glass of water has about the same salt content as a glass of sea water.25， the ocean, in contrast to the
10、water we use daily, contains26amounts of dissolved chemicals; it is too salty for human consumption.Some scientists estimate that the oceans contain as27as 50 quadrillion tons(50 million billion tons)of dissolved solids.If the salt in the sea could be28and spread evenly over the Earths land surface
11、it would form a layer more than 500 feet29， about the height of a 40story office building. What30the scientists curiosity is not so much31the ocean is salty, but why it isnt32like the rivers and streams that empty into it. Further, what is the33of the sea and of its“salts”？ And how does one34ocean w
12、aters remarkably uniform chemical composition? To these and related35， scientists seek answers with full awareness that little about the oceans is understood.16A.drinks BseemsCfeels Dtastes17A.respectable BindividualCcollective Dcommon18A.believed BconvincedCfirmed Dpersuaded19A.object BabandonCreje
13、ct Dreceive20A.glasses BcupsCbowls Dbottles21A.normally BregularlyCartificially Dnaturally22A.sweet BsaltyCbitter Dsour23A.amount BnumberCquality Dtotal24A.with BtoCinto Don25A.Subsequently BAbsolutelyCObviously DGenerally26A.unbelievable BabnormalCimaginable Dunacceptable27A.many BmuchClittle Dfew2
14、8A.removed BleftCmoved Dproduced29A.high BthickCwide Dbroad30A.causes BraisesCarouses Dlifts31A.how BasCthat Dwhy32A.fresh BsaltyCcool Dclean33A.rule BoriginCbase Dresource34A.say BseeCexplain Dexpress35A.problems BmatterCsituations Dquestions.阅读理解(共20小题，每小题2分，满分40分)阅读下面的文章，从题中所给的A、B、C、D四个选项中选出最佳答案。
15、AI realized that I was getting cold, and felt it was probably time to go back to the apartment, so I put my collar up against the wind and began to walk back up the cold street. I managed to get some food from a vendor(小贩), and walked on.About twentyfive minutes later I knew that something was wrong
16、. It was getting very, very cold, there were no streetlights, and the hill I was hoping to see on my right was nowhere in sight. There was almost no light except for mysterious red crosses shining from the tops of churches, and I was beginning to get worried. To cut a long story short, I had walked
17、the wrong way from a crossroads, and had wandered miles in the wrong direction. My head was aching from the cold, and I couldnt think straight. Turning around, I started back, and a long time later was outside the house I had set off from. It was at about that time I realized that I had a gate key b
18、ut no house key. How happy I was when I found that the front door was openmy only piece of good luck that day. My apartment was of course locked, my head felt like it was about to explode, and my hands and feet were freezing.I tried turning the handle. No luck. I tried another key from England. I wa
19、nted to avoid waking the family downstairs, so despite the fear of an early death from cold, I couldnt break the door down. What would my hosts think? I pulled an ATM card from my pocket and forced it alongside the inside of the lock. I didnt think it would work, but after fifteen minutes of trying,
20、 I heard a click. Another couple of minutes later the door was open. Relieved, I took off my clothes in the dark and got into bed.36The purpose of the passage is mainly to_.Atell us how difficult it is living abroadBshow us how terrible the weather wasCtell us an unusual experience abroadDshow us ho
21、w afraid the author was37What made the author find he had walked the wrong way?AHe didnt see the house.BA vendor reminded him.CThe street name reminded him.DHe didnt see the hill.38What can we learn from the passage?AThe front door was closed.BThe house had many locks.CThe author woke the hosts.DThe
22、 author came from England.39From the passage we can infer that the author was_.Acareful BcarelessCexcited DannoyingB(2010北京卷)I had an interesting conversation with a reporter recentlyone who works for you. In fact, hes one of your best reporters. He wants to leave.Your reporter gave me a copy of his
23、 resume(简历)and photocopies of six stories that he wrote for you. The headlines showed you played them proudly. With great enthusiasm, he talked about how he finds issues(问题), approaches them, and writes about them, which tells me he is one of your best. Im sure you would hate to lose him.Surprisingl
24、y, your reporter is not unhappy. In fact, he told me he really likes his job. He has a great assignment(分工), and said you run a great paper. It would be easy for you to keep him, he said. He knows that the paper values him. He appreciates the responsibility youve given him, takes ownership of his pr
25、ofession, and enjoys his freedom.So why is he looking for a way out?He talked to me because he wants his editors to demand so much more of him. He wants to be pushed, challenged, coached to new heights.The reporter believes that good stories spring from good questions, but his editors usually ask ho
26、w long the story will be, when it will be in, where it can play, and what the budget is.He longs for conversations with an editor who will help him turn his good ideas into great ones. He wants someone to get excited about what hes doing and to help him turn his story idea upside down and inside out
27、, exploring the best ways to report it. He wants to be more valuable for your paper. Thats what you want for him, too, isnt it?So your reporter has set me thinking.Our best hope in keeping our best reporters, copy editors, photographers, artistseveryoneis to work harder to make sure they get the hel
28、p they are demanding to reach their potential. If we cant do it, theyll find someone who can.40What does the writer think of the reporter?AOptimistic. BImaginative.CAmbitious. DProud.41What does the reporter want most from his editors in their talks?AFinding the news value of his stories.BGiving him
29、 financial support.CHelping him to find issues.DImproving his good ideas.42Who probably wrote the letter?AAn editor. BAn artist.CA reporter. DA reader.43The letter aims to remind editors that they should_.Akeep their best reporters at all costsBgive more freedom to their reportersCbe aware of their
30、reporters professional developmentDappreciate their reporters working styles and attitudesCLike dogs, sharks rely on a sharp sense of smell to track down food. But new research shows noses arent the only way that sharks detect smells: Their entire bodies, in fact, function as giant noses capable of
31、even picking up the“shape”of a smell.Running down the sides of every shark are nervepacked strips called side lines. Researchers know these sensitive structures can detect the faint movements sent by living things in water, but their ability to pick up the smell was previously unknown. Even more sur
32、prising, researchers said, is that side lines can detect the 3D“plumes”of smellsstructures looking like turbulence left behind after waving a hand through thick fog or steam.“Odor plumes are complex, dynamic, threedimensional structures used by many animal species to locate food, mates and home site
33、s，”said Jelle Atema, a Boston University biologist and coauthor of the study detailed in an upcoming issue of the Journal of Experimental Biology. When prevented from using“odor plumes”information, the study shows, sharks are unable to find the source of an odor.To find this out, researchers did an
34、experiment. They ran a stream of squid(鱿鱼)odor through a circulating water tank and noted a sharks ability to find the sourcewith no eddies(漩涡)and plumes to track, the shark almost always failed. They then used the same setup, but added a brick behind the smell source, thereby mixing the flow of the
35、 squids smell and giving the shark more information to track it. Sure enough, the shark got on much better in locating the“prey”Researchers also numbed(麻醉)the lateral lines with a common antibiotic, producing a similarly disabling effect on the sharks hunting abilities.“The results are interesting f
36、or our understanding of animals navigation under water and for the development of guidance of autonomous underwater vehicles，”Atema said.44What was the purpose of the experiment?AThey wanted to prove sharks are good at locating the prey.BThey wanted to prove sharks are unable to find the source of a
37、n odor without using “odor plumes”information.CThey wanted to prove sharks have a better navigation ability under water.DThey wanted to prove sharks can detect the faint movements sent by living things in water.45What part of body do dogs depend on to track down food?AMouths. BEyes.CTails. DNoses.46
38、In the experiment, why was a brick added behind the smell source?ATo give the shark more time to track it.BTo give the shark less information to track it.CTo confuse the shark with too many different odors.DTo give the shark more information to track it.47Which is the main idea of the passage?AShark
39、s use noses to hunt food.BHow do animals navigate in water?CSharks use“odor plumes”to hunt food.DOdor plumes are very useful for animals to locate food, mates and home sites.D(2010浙江卷)My family and I lived across the street from Southway Park since I was four years old. Then just last year the city
40、put a chain link fence around the park and started bulldozing(用推土机推平)the trees and grass to make way for a new apartment complex. When I saw the fence and bulldozers, I asked myself，“Why dont they just leave it alone？”Looking back, I think what sentenced the park to oblivion(被遗忘)was the drought(旱灾)w
41、e had about four years ago. Up until then, Southway Park was a nice green park with plenty of trees and a public swimming pool. My friends and I rollerskated on the sidewalks, climbed the trees, and swam in the pool all the years I was growing up. The park was almost like my own yard. Then the summe
42、r I was fifteen the drought came and things changed.There had been almost no rain at all that year. The city stopped watering the park grass. Within a few weeks I found myself living across the street from a huge brown desert. Leaves fell off the park trees, and pretty soon the trees started dying,
43、too. Next, the park swimming pool was closed. The city cut down on the work force that kept the park, and pretty soon it just got too ugly and dirty to enjoy anymore.As the drought lasted into the fall, the park got worse every month. The rubbish piled up or blew across the brown grass. Soon the onl
44、y people in the park were beggars and other people down on their luck. People said drugs were being sold or traded there now. The park had gotten scary, and my mother told us kids not to go there anymore.The drought finally ended and things seemed to get back to normal, that is, everything but the p
45、ark. It had gotten into such bad shape that the city just let it stay that way. Then about six months ago I heard that the city was going to“redevelop”certain wornout areas of the city. It turned out that the city had planned to get rid of the park, sell the land and let someone build rows of apartm
46、ent buildings on it.The chainlink fencing and the bulldozers did their work. Now we live across the street from six rows of apartment buildings. Each of them is three units high and stretches a block in each direction. The neighborhood has changed without the park. The streets I used to play in are jammed with cars now. Things will never be the same again. Sometimes_I_wonder,_though,_what_changes_another_drought_would_make_in_the_way_things_are_today.48H
