24. --- Do you think living in the country has advantages?
--- ____.
A. Yes, perfectly B. Yes, it is C. Well, that depends D. Nothing at all
23. - Can you give me some advice about the design?
- I think it should _______ to all ages and social groups.
A. appear B. appeal C. suit D. fit
22.--- How come your father can read books in German?
--- Well, he on a project with some German engineers for 3 years when he was young.
A.worked B.was working C.had worked D.would work
第一节:单项填空(共15小题,每小题1分,满分15分)
从A、B、C、D四个选项中,选出可以填入空白处的最佳选项。
21.It was reported that 115 miners in the flooded mine for eight days were pulled out alive at last.
A.trapped B.being trapped C.were trapped D.had trapped
21.设函数,.
(Ⅰ)若,求的极小值;
(Ⅱ)在(Ⅰ)的条件下,是否存在实常数和,使得和?若存在,求出和的值.若不存在,说明理由.
(Ⅲ)设有两个零点,且成等差数列,试探究值的符号.
20.已知数列中,当时,
(Ⅰ)证明:为等比数列;
(Ⅱ)求数列的通项;
(Ⅲ)若数列满足,求的前项和
19.如图所示,在一条海防警戒线上的点、、处各有一个水声监测点,、两点到点的距离分别为千米和千米.某时刻,收到发自静止目标的一个声波信号,8秒后、同时接收到该声波信号,已知声波在水中的传播速度是千米/秒.
(Ⅰ)设到的距离为千米,用表示,到的距离,并求的值;
(Ⅱ)求到海防警戒线的距离.
18.数列已知数列的前项和是,且.
(Ⅰ)求数列的通项公式;
(Ⅱ)设,求适合方程的的值。
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