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
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
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
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
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
20、(本题16分)已知函数
(1)试求所满足的关系式;
(2)若, 在为增函数,求的取值范围。
(3)若,方程在有唯一解,求a的取值范围;
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?
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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