33、impacting a neighborhood or community, or very large, affecting several states.16 Some floods develop slowly ， sometimes over a period of days.But flash floods can develop quickly, sometimes in just a few minutes and without any visible(看得见的) signs of rain.Rash floods often have a dangerous wall of ro 。

34、aring water and can take away most things in its path.Floods happen when a watercourse (水道) overflows. 17 Heavy rainWhen the ground already contains a lot of water, the falling rain could not seep through it.The water then starts flowing toward a watercourse.When it rains a lot in a region, all wate 。

35、r flows toward the river, but this river can not containit. 18 ThawWhen spring arrives, snow and ice start to melt and the water flows toward the river. 19the river overflows and a flood happens.Ice jamIn spring, rivers thaw out and pieces of ice drift on the river. 20As a result, these pieces of ic 。

36、e form a kind of dam水(坝). When water cannot flow through this dam, it tries to find another course to reach the river and sometimes, this new course is a field, a road or a house basement.AWe can think of some ways to prevent the flood from happening.BHowever, all floods are not alike. CTherefore, t 。

37、he river overflows.DSometimes these ice pieces get jammed against a bridge or rocks. EThey could be caused by heavy rain, thaws (解冻) or ice jams (冰塞)FOne of the biggest problems people faced was lack of fresh water.GIf the temperature rises too rapidly, a lot of water is produced in a short time.完形填 。

38、空In 2000, a report was published about what the earth might be like in 20 years from then on. The report was the result of a threeyear21 .According to the report, the picture of the earth in the year 2020 is not a 22 one. The world will be more 23because the population will continue to grow. The pop 。

39、ulation could be 246,300 million, almost 2,150 million more than that in 1985. More people would move into cities, especially cities in 25countries.Cities like Cairo and Jakarta probably would 26have 15 million by then.Food production will 27，but not enough to feed all the people. Farmers will gro 。

40、w 90% more food than they did in 1985, 28most of the increase would be in countries that 29produce enough food for their people. Little increase is 30in South Asia, Africa and the Middle East. Poor ways of farming are 31 large areas of farmland, changing farms into deserts. More farmland is 32as cit 。

41、ies become larger and more houses are built. 33will get worse as industrial countries burn more coal and oil. Many of the worlds 34could disappear as more and more trees are cut down. Energy will continue to be a serious problem. The experts say their picture of the earth for the year 2020 35 . They 。

42、 only carried out the situation that 36today. By changing the situation, by 37the problems, the picture can be changed. There is 38time for the nations of the world to work39a plan of action. But they warned that 40too long to make decisions would greatly reduce the chances of success.21Alearning Cn 。

43、otice 22Apleased Csafe 23Adangerous Ccrowded 24Ano more than Cas much asBproject Dstudy Bpleasant Dblue Bbeautiful Dterrible Bas many as Das large as25Adeveloping Cbig 26Anone Call 27Ainsist Cincrease 28AsoCor 29Aalready Cpartly 30Awanted Cfound 31Adestroying Cdisturbing 32Asaved CdiscoveredBdevelop 。

44、ed Dmountainous Beach Dneither Breduce Dcontinue Bbut Dhowever Bhardly Dnever Blacked Dexpected Bprotecting Dinterrupting BlostDused33AAir pollutionBWater pollutionCSome diseases 34Aanimals Cforests 35Amust be true Ccant be true 36Ahappens Cexists 37Asettling Canswering 38AnoCless 39Aabout Cout 40Aw 。

45、orking Cspending .语法填空DAll farmland Bplants DpeopleBwill come true Dmay be wrong Bdevelops Dappears Bworking Ddealing Bstill Dplenty of BinDfor Bsuggesting DwaitingNearly all of us have dreamed about winning the big prize in a lotter彩y 票( ).We dream about 41we would do with the money, but we rarely。

46、stop to think about how the money would change us.For most of us, our way of life is 42(close) linked to our economic circumstances. The different parts of 43lives fit together like a jigsaw拼(图) work, home, friends, hobbies, and sports make up our world. A sudden 44 (fortunate) would change it all a 。

47、nd break the jigsaw. For example, most people like the idea 45not having to work, but winners have found that without work there is no reason to get up in the morning. It seems great 46(move) to a bigger housein a wealthy area, 47if you do that, you leave old friends behind.Usually, winners 48(advis 。

48、e) not to publicize their address and phone number, but begging letters still arrive. 49they are not careful, most of their money will be spent on the 50(protect) of their homes and swimming pools and their sanity!4142.43.44.45.46.47. 48.49.50. .短文改错My parents and I went to the park last Sunday. The 。

来源：(未知)

【学习资料】网址：/a/2021/0417/0021956159.html

标题：单元|单元仿真检测(二)_Unit_2_Working_the_land( 三 )