0  414754  414762  414768  414772  414778  414780  414784  414790  414792  414798  414804  414808  414810  414814  414820  414822  414828  414832  414834  414838  414840  414844  414846  414848  414849  414850  414852  414853  414854  414856  414858  414862  414864  414868  414870  414874  414880  414882  414888  414892  414894  414898  414904  414910  414912  414918  414922  414924  414930  414934  414940  414948  447090 

27.Every time Ashtita tries to break a record, he reaches a point ______ he feels he cannot physically do any more.

    A.where         B.that           C.when          D.which

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26.The boy talked his mother ________ buying him a home computer.

    A.of            B.over           C.to            D.into

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25.When ______ about the secret of his success, Steven Spielberg said that he owes much of his success and happiness ________ his wife and children.

    A.asking; to                       B.asked; in       

    C.asked; to                       D.asked; about

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24.To enjoy the scenery, Sara would spend long hours on the train ______ travel by air.

    A.as to          B.other than       C.instead of       D.rather than

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23.The audience ______ when they heard the humorous story.

    A.burst into laughing                B.burst out laughter

    C.burst into laughter                 D.burst in laughing

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22.- I’m sorry.That wasn’t of much help.

    - Oh, _______ .As a matter of fact,it was most helpful.

    A.sure it was                      B.it doesn’t matter

    C.of course not                    D.thanks anyway

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第一节 单项填空(共15小题,每小题1分,满分15分)

21.- What about ______ lecture you attended yesterday?

    - To tell the truth, it was too boring.I can't stand ______ lecture like that.

    A.a; the          B.the; a          C.the; 不填       D.the; the

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15.有两排座位,前排11个座位,后排12个座位,现安排2人就座,规定前排中间的3个座位不能坐,并且这2人不左右相邻,共有多少种不同排法?

解:∵前排中间3个座位不能坐,

∴实际可坐的位置前排8个,后排12个.

(1)两人一个前排,一个后排,方法数为C·C·A种;

(2)两人均在后排左右不相邻,共AA·AA种;

(3)两人均在前排,又分两类:

①两人一左一右,共C·C·A种;

②两人同左同右,有2(AA·A)种.

综上可知,不同排法种数为

C·C·A+A+C·C·A+2(AA·A)=346种.

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14.已知平面αβ,在α内有4个点,在β内有6个点.

(1)过这10个点中的3点作一平面,最多可作多少个不同平面?

(2)以这些点为顶点,最多可作多少个三棱锥?

(3)上述三棱锥中最多可以有多少个不同的体积?

解:(1)所作出的平面有三类:①α内1点,β内2点确定的平面,有C·C个;②α内2点,β内1点确定的平面,有C·C个;③αβ本身.

∴所作的平面最多有C·C+C·C+2=98(个).

(2)所作的三棱锥有三类:①α内1点,β内3点确定的三棱锥,有C·C个;②α内2点,β内2点确定的三棱锥,有C·C个;③α内3点,β内1点确定的三棱锥,有C·C个.

∴最多可作出的三棱锥有:

C·C+C·C+C·C=194(个)

(3)∵当等底面积、等高的情况下三棱锥的体积相等.

且平面αβ,∴体积不相同的三棱锥最多有

C+C+C·C=114(个)

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