卫生A代码12 　　1.we are worried++changeable 　　2.the umrella was ++cleverly 　　3.compentitors must ++obey 　　4.the details of ++real 　　5.she is an ++bear 　　6.the new garment ++clothes 　　7.the way she++ ？ 　　8.some newspapers in++especially 　　9.the coastal area ++warm 　　10.they have++water 　　11.he wore++old 　　12.his answers++unclear 　　13.only people++qualifred 　　14.the weather++pleasant 　　15.the latest++lists 　　16.a new++wrong 　　17.cardlac arrest++right 　　18.defibrillators are ++wrong 　　19.the new computer++wrong 　　20.the non-linear++wrong 　　21.the early-warning++not 　　22.the researchers++right 　　23.paragraph2++defin the 　　24.paragraph3++turn off 　　25.paragraph4++keep 　　26.paragraph5++take 　　27.the tiredness++low 　　28.sleeping++poor 　　29.a lower++exposure 　　30.a strong ++the 　　31.according to the++more 　　32.peopli++lung 　　33.according to theachman,couples++eat 　　34.according to theachman,single++their expectation 　　35.techman++the participants were 　　36.the sahel++occuples 　　37.what is the situation++the deserts are expanding 　　38.the world++worsened 　　39.what is the root++overpopulation 　　40.in orde to++developing 　　41.Dr ++not been proved 　　42.the clinical ++both calcium 　　43.the findings++only 　　44.the adverse++forgetfulness 　　45.according to++the amount 　　补全短文 　　46.an extra 　　47.a few 　　48.the cardiovascular 　　49.the body 　　50.pregnant 　　完形填空 　　51.through 　　52.valued 　　53.provide 　　54.surveyors 　　55.available 　　56.effective 　　57.fallen 　　58.which 　　59.prevented 　　60.access 　　61.in 　　62.soon 　　63.weigh 　　64.losses 　　65.with

第二篇 Deforestation and Desertification(沙漠化) 　　TheSahel zone lies between the Saharadesert and the fertile savannahs(热带大草原)ofnorthern Nigeria and South Sudan. The word sahel comes from Arabic and means marginal or transitional ,andthis is a good description of thesesemi-arid(半干旱)lands,whichoccupy much of the Western African countries of Mail,Mauritania,Niger,and Chad. 　　Unfortunately, over the last century theSahara desert has steadily crept southwards eating into once productive Sahellands. United Nations surveys show that over 70 percent of the dry land inagriculture use in Africa has deterioratedover the last 30 years. Droughts have become more severe, the most recentlasting over twenty years in parts of the Sahel region. The same process ofdesertification is taking place across southern Africa as the Kalahari desertadvances into Botswana and parts of South Africa. 　　One ofthe major causes of this desert advance ispoor agricultural land use, driven by the pressures of increasing population.Overgrazing一 keeping too many farm animals on the land一means that grasses and other plants cannot recover, and scarce water suppliesare exhausted. Overcultivation一 tryingto grow too many crops on poor land一 resultsin the soil becoming even less fertile and drier, and beginning to break up. Soilerosion (侵蚀) follows, and the land turns into desert. 　　Another cause of desertification is loss of tree cover. Trees are cutdown for use as fuel and to clear land for agricultural use. Tree roots help tobind the soil together, to conserve moisture, and to provide a habitat forother plants and animals. When trees are cut down, the soil begins to dry andloosen, wind and rain erosion increase, other plant species die, and eventuallythe fertile top soil may be almost entirely lost, leaving only bare rock anddust. 　　The effects of loss of topsoil and increased drought are irreversible. Theyare,however, preventable. Careful conservation of tree cover and sustainableagricultural land use have been shown to halt deterioration of soils and lessenthe effects of shortage of rainfall. One project in Kita in south-west Malifunded by UNDP has involved local communities in sustainable management offorest,while at the same time providing a viable(有活力的)agriculturaleconomy. This may be a model for similar projects in otherWest African countries. 　　 　　36.The Sahel zone is an area which ___. 　　A. is covered with sad and grass 　　B. has a long history 　　C. occupies much of South Nigeria 　　D. belongs to Sudan 　　答案：a 　　37. What is the situation about thedesertification in Africa? 　　A. The deserts are replaced withgrasslands 　　B. The deserts are expanding 　　C. the deserts are moving northwards 　　D. the deserts are being deserted 　　答案：b 　　38. The word “deteriorated ” in paragraph2 means ___. 　　A. deepened 　　B. suffered 　　C. slipped 　　D. worsened 　　答案：d 　　39. What is the root causeof desertification? 　　A. poor farming 　　B. overpopulation 　　C. radical climate change 　　D. disappearance of rare plant species 　　答案：a 　　40. In order to prevent desertification,the author proposes ___. 　　A. making good use of international aids 　　B. developing a sustainableagricultural economy 　　C. gaining international support 　　D. converting agricultural land intoforest 　　答案：b