单选题记Sn=a1+a2+…+an，令，称Tn为a1，a2，a3，…，an这个数列的“理想数”。已知a1，a2，a3，…，a500的“理想数”为2004，那么8，a1，a2，a3，…，a500的“理想数”为______A.2004B.2006C.2008D.2010E.2012

单选题A square countertop has a square tile inlay in the center, leaving an untiled strip of uniform width around the tile. If the ratio of the tiled area to the untiled area is 25 to 39, which of the following could be the width, in inches, of tile strip? Ⅰ.1 Ⅱ.3 Ⅲ.4 (A) Ⅰ only (B) Ⅱ only (C) Ⅰ and Ⅱ only (D) Ⅰ and Ⅲ only (E) Ⅰ, Ⅱ, and Ⅲ

单选题若x，y满足x2+y2-2x+4y=0，则x-2y的最大值为______ A.3 B.0 C.5 D.-10 E.10

单选题△ABC的内切圆的半径为5，它和AB，AC边的切点相距6，则内切圆心到A的距离为( )．

单选题下列关系式正确的是()．

单选题一满桶纯酒精倒出10升后，加满水搅匀，再倒出4升后，再加满水。此时，桶中的纯酒精与水的体积之比是2:3，则桶的容积是______。 A.15 B.18 C.20 D.22 E.25

单选题已知分式的值恒小于1，那么实数k的取值范围是()．(A)k＞1(B)k≤3(C)1＜k＜3(D)1≤k≤3

单选题设随机变量X的概率密度为f(x)，a≠0是一常数，则可以作为某随机变量的概率密度的是

单选题{{B}}Directions:{{/B}}{{I}} Read the following passage. For each numbered blank there are four choices marked A, B, C and D. Choose the best one and mark your answers on ANSWER SHEET 1.{{/I}} The government is to ban payments to witnesses by newspapers seeking to buy up people involved in prominent cases{{U}} {{U}} 1 {{/U}} {{/U}}the trial of Rosemary West. In a significant{{U}} {{U}} 2 {{/U}} {{/U}}of legal controls over the press, Lord Irvine, the Lord Chancellor, will introduce a{{U}} {{U}} 3 {{/U}} {{/U}}bill that will propose making payments to witnesses{{U}} {{U}} 4 {{/U}} {{/U}}and will strictly control the amount of{{U}} {{U}} 5 {{/U}} {{/U}}that can be given to a case{{U}} {{U}} 6 {{/U}} {{/U}}a trial begins In a letter to Gerald Kaufman, chairman of the House of Commons media select committee. Lord Irvine said he{{U}} {{U}} 7 {{/U}} {{/U}}with a committee report this year which said that self regulation did not{{U}} {{U}} 8 {{/U}} {{/U}}sufficient control. {{U}} {{U}} 9 {{/U}} {{/U}}of the letter came two days after Lord Irvine caused a{{U}} {{U}} 10 {{/U}} {{/U}}of media protest when he said the{{U}} {{U}} 11 {{/U}} {{/U}}of privacy controls contained in European legislation would be left to judges{{U}} {{U}} 12 {{/U}} {{/U}}to Parliament. The Lord Chancellor said introduction of the Human Rights Bill, which{{U}} {{U}} 13 {{/U}} {{/U}}the European Convention on Human Rights legally{{U}} {{U}} 14 {{/U}} {{/U}}in Britain, laid down that everybody was{{U}} {{U}} 15 {{/U}} {{/U}}to privacy and that public figures could go to court to protect themselves and their families.

单选题曲线在处的法线方程为______A．B．y=1C．y=x+1D．y=x-1

单选题函数y=x2-x+1在区间[-1，3]上满足拉格朗日中值定理的ξ等于____．A．B．0C．D．1

单选题若三次多项式f(x)满足f(2)=f(-1)=f(1)=0，f(0)=4，则f(-2)=______．

单选题若函数F(x)和G(x)都是函数f(x)的原函数，则下列四个式子，正确的是( )。

单选题某交通岗共有3人，从周一到周日的七天中，每天安排一人值班，每人至少值2天，其不同的排法共有______