26. ______put great pressure on the local government to tell the truthfulness of the tiger photo as soon as possible.
A.The great loss of lives in the mine B. The human cases of bird flu
C. The customers’ complaints D. The questions from people especially experts[来
25. When he was a student, he would get up early and work late into night, believing “______________”
A. Never too late to learn. B. Never count your chickens until they are hatched.
C. The early bird catches the worm. D. Everyone has his feet of clay
24. The colors on the national flags can be ______ differently in different culture, but they have one thing in common, that is, ______of the colours was carefully chosen.
A. translated; every B. explained either C. represented ; all D. interpreted; each
23. Great inventors don’t ______ graduate from famous universities. Some didn’t even go to university.
A. likely B. necessarily C. really D. nearly
22. ______ ugly, these chocolate cookies don’t sell well even though they taste good.
A. Looked B. Looking C. Being looked D. To look
从A、B、C、D四个选项中,选出可以填入空白处的最佳选项,并在答题卡上将该项涂黑。
21. Without _____thorough understanding of China’s specific conditions, you can’t have ______ say over the only-child policy.
A. a; the B. the; a C. a; a; D. the; the
20.(本小题满分14分)
已知函数.
(1)若为的极值点,求的值;
(2)若的图象在点()处的切线方程为,
( 3 )求在区间上的最大值;
(4)求函数()的单调区间.
21(本小题满分16分)
定义在D上的函数,如果满足:对任意,存在常数,都有成立,则称是D上的有界函数,其中M称为函数的上界.
已知函数;.
(1)当a=1时,求函数在上的值域,并判断函数在上是否为有界数,请说明理由;
(2)若函数在上是以3为上界的有界函数,求实数a的取值范围;
(3)若,函数在上的上界是,求的取值范围.
17(本小题满分13分)
(1) 解关于x的不等式;
(2)记(1)中不等式的解集为A,函数 的定义域为B.若,求实数a的取值范围.
18(本小题满分13分)
已知二次函数,且.
(1) 若函数与x轴的两个交点之间的距离为2,求b的值;
(2) 若关于x的方程的两个实数根分别在区间内,求b的取值范围.
19.(本小题满分14分)
三棱柱中,侧棱与底面垂直,,, 分别是,的中点.
(1)求证:平面;
(2)求证:平面;
(3)求二面角的余弦值.
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