财务中心根据相关记录及各部门的预算分析报告进行核对，分析差异产生原因。于每月25日前

按要求证明下列各题．

（1）已知a₁+a₂+a₃+a₄＞100，用反证法证明a₁，a₂，a₃，a₄中，至少有一个数大于25；

（2）已知a，b是不相等的正数．用分析法证明a³+b³＞a²b+ab²．

一次函数y=-3x+6中，y的值随x值增大而（    ）。

Want to be a volunteer for Beijing Olympics in 2008? Recently, the recruiting started.

The recruiting of Beijing Olympics Volunteer starts from Aug 28, 2006 to end of March 2008.

Stage 1: Beijing Volunteers

From August 28, 2006, the program opens to applicants in Beijing (and Beijing only).

Stage 2: China Volunteers

From Dec, 2006, people from outside Beijing can submit their application.

Stage 3: Overseas Volunteers

By March 2007, people from outside China (including in other countries) can apply for volunteering in Olympics 2008.

The Program

Travel, hotel are not provided. Only working meal is available for volunteers (makes sense, isn't it?)

If you have any questions, just call Olympics Volunteer hotline: +86-10-12308

According to news, 100k college students have applied for the position after three days of recruiting. 50,000 to 100,000 volunteers are needed for the game.

If you want to participate, just call the number and ask more questions about the program. However, my guess is, to be admitted to the program is not easy.

小题1:Who has the most time to apply for volunteering in Olympics 2008 ?

A．Liling from Beijing

B．Wangbing from Tianjin .

C．Jane from Australia

D．Dongdong from Yunnan.小题2:Being a volunteer in Olympics 2008 , you can enjoy free ________ service.

A．food

B．taxi

C．hotel

D．ticket小题3:Why does the author think it is not easy to be admitted to the program?

A．Because too many people want to watch the game live.

B．Because the volunteers can have good free meals every day.

C．Because the volunteers can watch the game without buying a ticket.

D．Because more and more people care for the Olympics .

孕妇需避免X线检查，是因为

A．X线的光化学作用

B．X线的荧光作用

C．X线的生物作用

D．X线的感光作用

E．以上都不是

著名的八大公害事件中属于大气污染事件的有（）个

A.3

B.4

C.5

D.6