25.Nowadays food safety is a big problem and nobody can guarantee all foods are safe to us, but food produced in the normal companies is better.
A.strictly B.absolutely C.relatively D.exactly
24.The teacher said we ten lessons by the end of this term.
A.should have studied B.were going to study
C.have studied D.should study
23.AIDS is said the number one killer of both men and women over the past few years in that poor area, where no medical services are available.
A.to be B.to have been C.being D.having been
22.It is said that the weather will cold for another three or four days.
A.look B.stay C.last D.get
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.We have every reason to beehive that 2010 World Expo in Shanghai will be success.
A./; a B.the; / C.the; a D.a; a
22.(本小题14分)列三角形数表
1 -----------第一行
2 2 -----------第二行
3 4 3 -----------第三行
4 7 7 4 -----------第四行
5 11 14 11 5
… … … …
… … … … …
假设第行的第二个数为
(1)依次写出第六行的所有数字;
(2)归纳出的关系式并求出的通项公式;
(3)设求证:…
21.(本题满分12分)已知:,求证:
(1)计算的值;
(2)中至少有一个不小于。
20、(20分)甲、乙、丙三台机床各自独立地加工同一种零件,已知甲机床加工的零件是一等品而乙机床加工的零件不是一等品的概率为,乙机床加工的零件是一等品而丙机床加工的零件不是一等品的概率为,甲、丙两台机床加工的零件都是一等品的概率为
(1)分别求甲、乙、丙三台机床各自加工的零件是一等品的概率;
(2)从甲、乙、丙加工的零件中各取一个检验,求至少有一个一等品的概率.
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