25. fresh air,people may start to feel sick.So make sure you open the windows while working.
A.For the absence of B.In the absence of
C.In the honor of D.In the short of
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
20、已知函数和点,过点作曲线的两条切线、,切点分别为、.
(Ⅰ)设,试求函数的表达式;
(Ⅱ)是否存在,使得、与三点共线.若存在,求出的值;若不存在,请说明理由.
(Ⅲ)在(Ⅰ)的条件下,若对任意的正整数,在区间内总存在个实数,,使得不等式成立,求的最大值.
19、设函数
.对于正项数列,其前
(1)求实数 (2)求数列的通项公式
(3)若大小,并说明理由。
18、将函数在区间内的全部极值点按从小到大的顺序排成数列,.
(Ⅰ)求数列的通项公式;
(Ⅱ)设,求证:,.
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