24.-Tom is said to have been accused of mismanagement.
-It’s not fair.I don’t think him the person for what happened.
A.to be blamed B.to blame
C.blamed D.blame
23.In the character-training of children,what really much is what their parents
say and do.
A.matters B.concerns C.cares D.minds
22.In face of failure,we should keep up good state of mind instead of being depressed.
A./;the B.a;the C.the;a D./;a
第一节:从下面每个句子后面所给的A、B、C、D四个选项中选出一个最佳答案。(共15小题,每小题1分,计15分)
21. your worries with the friend you trust,-you will feel relieved.
A.Share B.To share
C.Sharing D.Having shared
22.(14分)
如图,A是单位圆与轴正半轴的交点,点、在单位圆上,
,四边形的面积为。
(1)设,求的最大值及此
时的值。;
(2)以为始边作角、,它们终边分别与单位圆相交于,
点用向量的数量积证明;;
(3)利用(2)的结论推导公式:。
21.(12分)
给定函数且),
(1)求函数的定义域;
(2)当时,求的取值范围;
(3)当时,判断函数的单调性,并证明你的结论。
20.(12分)
已知函数有两个零点1和3,且对,不等式恒成立,求满足条件的的解集。
19.(12分)
设函数,且
(1)求证:函数有两个零点;
(2)设是函数的两个零点,求的取值范围。
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