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2.分解因式:x-x=__________.

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1.2的平方根是_________.

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    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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