单选题已知双曲线(a＞0,b＞0)右焦点为F，右准线l与两条渐近线分别交于P和Q点．若△PQF是直角三角形，则双曲线的离心率e=()．

单选题You've been talking with David all evening when you ought to be ______ with other guests. A. blending B. integrating C. mingling D. incorporating

单选题园林工人要在周长300m的圆形花坛边等距离地栽上树．他们先沿着花坛的边每隔3m挖一坑，当挖完30个坑时，突然接到通知：改为每隔5m栽一棵树．这样，他们还要挖( )个坑才能完成任务．

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{{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______

单选题=______。A．ln2B．C．D．

单选题设(1+x)+(1+x)2+(1+x)3+…+(1+x)20=a0+a1x+a2x2+…+a20x20，则a1+a2=( )。 (A) 210 (B) 231 (C) 1150 (D) 1540

单选题参数方程在xOy平面上表示的曲线是______．

单选题直线ax-by=0与圆x2+y2-ax+by=0(a,b≠0)的位置关系是( )。

单选题函数I(x)=在区间[e，e2]上的最大值为()．(A)ln(1+e)

单选题某个锐角的正弦和余弦是二次方程ax 2 +bx+c=0的不同的两个根，则a，b，c之间的关系是______．