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25. In fact, Picasso abandoned the old style of painting and starting from scratch, ________a style of art known as cubism.

  A. to create         B. creating            C. created           D. having created

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24. Just on the surface of the pond ________, giving people a feeling of being peaceful.

  A. floated hundreds of lotus plants            B. did hundreds of lotus plants float  

C. hundreds of lotus plants were floating        D. hundreds of lotus plants floated

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23. Last week the professor delivered a speech, over half of which was ________ to the issue of unemployment.

  A. exhibited         B. spent              C. admitted          D. devoted

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22. ---Shall we go to the exhibition or to the concert?

  ---________.

  A. It’s your opinion                       B. I don’t mind

  C. That’s your decision                    D. It’s all up to you

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第一节: 单项填空(共15小题;每小题1分,满分15分) 从A、B、C、D四个选项中,选出可以填入空白处的最佳选项。

21. In 1970, Kate, ________small British child, performed on ________stage for the first time.

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

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20、(本题16分)已知函数

(1)试求所满足的关系式;

(2)若为增函数,求的取值范围。

(3)若,方程有唯一解,求a的取值范围;

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19、(本题16分)如图,宽为的走廊与另一宽为b的走廊垂直相连,设细杆AC的长为

(1)试用表示

(2)当时,求当细杆AC能水平通过拐角时的最大值;

(3)当=8a时,问细杆AC能水平通过拐角,则另一走廊宽b至少是多少?

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18.(本题15分)已知函数().

(1)若的定义域和值域均是,求实数的值;

(2)若在区间上是减函数,且对任意的,总有,求实数的取值范围.

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