4. --James didn’t turn up last night, did he?
--No. He .We had changed our plan.
A.shouldn’t have come B. needn’t have come
C. didn' t need to come D. needn't come
3. Authorities face a(n) task to persuade typhoon survivors to abandon their flood-stricken villages and relocate to lower and safer lands.
A. complex B. tough C. easy D. sharp
2. In 1778,Banks was elected president of the Royal Society, position he held for 42 years.
A. the; the B./;a C. a; a D/;the
第一节:单项填空(共20小题;每小题1分,满分20分)
1. --I' m afraid that I can’t finish the task as soon as planned.
-- .
A. Don't be afraid B. Don't mention it C. I suppose so D. Take your time
20. (本小题满分14分)
数列满足:
(I)若数列为常数列,求的值;
(II)若,求证:
(III)在(II)的条件下,求证:数列单调递减。
19. (本小题满分13分)
已知两点,曲线上的动点满足,直线与曲线交于另一点。
(I)求曲线的方程;
(II)设,若,求直线的方程。
18. (本小题满分13分)
设,函数。
(I)若,求曲线在点处的切线方程;
(II)求函数在上的最小值。
17. (本小题满分13分)
如图,一圆形靶分成A,B,C三部分,其面积之比为1:1:2,某同学向该靶投掷3枚飞镖,每次1枚,假设他每次投资必定会中靶,且投中靶内各点是随机的。
(I)求该同学在一次投掷中投中A区域的概率;
(II)设表示该同学在3次投掷中投中区域的次数,求的分布列;
(III)若该同学投中三个区域分别可得3分,2分,1分,求他投掷3次恰好得4分的概率。
16. (本小题满分14分)
已知三棱柱的侧棱垂直于底面,°,
分别是的中点。
(I)证明:;
(II)证明:平面;
(III)求二面角的余弦值。
15. (本小题满分12分)
已知函数
(I)求的最小正周期;
(II)设,判断函数的奇偶性,并加以证明。
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