2.分解因式:x-x=__________.
1.2的平方根是_________.
In 1990 a report was published about 36 the earth might be like 20 years from then on.The report was a result of a three-year study.
According to the report, the picture of the earth in the year 2010 is not a 37 one.The world will be more 38 because the population will continue to grow.The population could be 39 6,300 million, almost 2,500 million more than in 1985.More people would move into cities, 40 cities in developing countries.Such cities as Cairo and Jakarta probably would 41 have 15 million by then.
Food production will 42 , but not enough to feed all the people.Farmers will grow 90% more food than they did in 1985, 43 most of the increase would be in countries that 44 produce enough food for their people. 45 increase is expected in South Asia, Africa and the Middle East.Poor farming ways are 46 large areas of crop land, changing farms into deserts.More farmland is 47 as cities become larger and more houses are built. 48 will get worse as industrial countries burn more coal and oil.Many of the world’s forests could disappear as more and more trees 49 .Energy will continue to be a serious problem.The experts say their picture of the earth for the year 2010 50 .They only pictured the situation that 51 today.By changing the situation, by 52 the problems, the picture can be changed.There is 53 time for nations of the world to 54 a plan of action.But they warned that 55 too long to make decisions would greatly reduce the chances of success.
36.A.that B.whether C.how D.what
37.A.pleased B.pleasant C.safe D.clean
38.A.dangerous B.brilliant C.crowded D.awful
39.A.no more than B.as many as C.as much as D.as large as
40.A.especially B.specially C.deliberately D.apparently
41.A.none B.each C.all D.neither
42.A.insist B.reduce C.increase D.continue
43.A.so B.but C.or D.however
44.A.already B.hardly C.partly D.never
45.A.Much B.More C.Heavy D.Little
46.A.destroying B.protecting C.disturbing D.interrupting
47.A.saved B.lost C.discovered D.used
48.A.Air pollution B.Water pollution C.Some diseases D.All farmland
49.A.is cut across B.is cut up C.are cut down D.are cut off
50.A.must be true B.will come true C.can’t be true D.may be wrong
51.A.happens B.develops C.exists D.appears
52.A.settling B.working out C.answering D.dealing
53.A.much B.still C.less D.fewer
54.A.work about B.work at C.work out D.work for
55.A.working B.suggesting C.spending D.waiting
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