25. the weather ,the sports meet will be held on time .
A. Instead of B. In relation to C. Regardless of D. In favor of
24.In front of the farmhouse ______.
A.lay a poor man B.laid a poor man
C.a poor man lay D.did a poor man lie
23.____ Sunday, the students are at home. A. Being B. To be C. It is D. It being
22.Most animals have little connection with animals of a different
kind , they hunt them for food .
A. if B while C. unless D. as
第一节 单项填空(共15小题; 每小题1分, 满分15分)
21. In face of failure , it is the most important to keep
up good state of mood .
A. / ; a B. a ; / C. the ; / D. /; the
22.如图,椭圆长轴端点为,为椭圆中心,为椭圆的右焦点,
且,.
(Ⅰ)求椭圆的标准方程;
(Ⅱ)记椭圆的上顶点为,直线交椭圆于两点,问:是否存在直线,使点恰为的垂心?若存在,求出直线的方程;若不存在,请说明理由
诏安一中、长泰一中、龙海二中、平和一中、南靖一中五校联考
2009-2010学年上学期期末考
21.已知函数
(1)求函数的单调区间;
(2)曲线在点和处的切线都与轴垂直,若曲线在区间上与轴相交,求实数的取值范围;
20. 如图,四棱锥的底面是正方形,侧棱⊥底面,,为的中点.
(1)证明://平面;
(2)在棱上是否存在点,使三棱锥的
体积为?并说明理由.
19.现有8名数理化成绩优秀者,其中数学成绩优秀,物理成绩优秀,化学成绩优秀.从中选出数学、物理、化学成绩优秀者各1名,组成一个小组代表学校参加竞赛
(Ⅰ)求被选中的概率;
(Ⅱ)求和不全被选中的概率