在相同温度与饱和状态下，R12制冷剂较R22制冷剂之压力为何（） A.较高 B.较低

让原来静止的氢核，氘核，氚的混合物经同一电场加速后，速度最大的是______．

符号标志技术对不熟练的阅读者更为有效，主要促进选择性保持与迁移。

下列各句中，没有语病的一句是( )。

A．这次网络短训班的学员，除北大本校人员外，还有来自清华大学等15所高校的教师、学生和科技工作者也参加了学习。

B．我们的报刊、杂志、电视和一切出版物，更有责任作出表率，杜绝用字不规范的现象，增加使用语言文字的规范意识。

C．在新的千年里，中 * * 这条巨龙一定会昂首腾飞于无垠的天际，创造出令世界惊异的奇迹来。

D．这家工厂虽然规模不大，但曾两次荣获省科学大会奖，三次被授予省优质产品称号，产品远销全国各地和东南亚地区。

阅读理解

     Live__the__"American__Dream"

     What is it: Work & Travel USA

     Who are qualified: Fulltime college students, above 18 years old

     About the program: Application for the 2009 Work & Travel USA program has just started.

It's an 8～16 weeks' summer program for college students to work and travel in the U. S..

Employers include Boeing, Hilton Hotel and 7Eleven. For next summer, about 3,500 positions are

open to Chinese students. Applicants must pass a language test and sometimes an interview, and pay

a registration fee to join the program.

      (source : www. Cultureexchange. org)

     Hundreds__needed__by__Volkswagen

     What is it: Shanghai Volkswagen jobs

     Who are qualified: College students graduating in 2009

    About it: Shanghai VW offers over 300 positions from engineering to marketing to college students

graduating in 2009. Applicants should have an excellent academic record, CET6 or the same level

language certificate in German, and good computer skills.  Campus talks will take place in Shanghai,

Changchun, Harbin, Wuhan, Changsha, Nanjing, Beijing and Xi'an from October.

     (source: campus chinahr. com/2009/pages/csvw)

     Xiaonei__looking__for__graduates

     What is it: Oak Pacific Interactive (OPI) internships (实习)

     Who are qualified: College juniors and firstyear postgraduate students

     About it: OPI is now offering internship positions for test engineer, development engineer and

assistant to the director of corporate culture. For engineering positions, candidates should major

in computer science or a related field, have communication ability and be familiar with various

development languages. For assistant to the director positions, candidates should be adept in document

writing, activities organizing and office software.

     (source: campus. xiaonei. com)

1. These advertisements are most probably advertisements ________. 

A. on the Internet intended for the general public to read

B. in a newspaper intended for large companies to read

C. on the Internet intended for college students to read

D. in a newspaper intended for college students to read

2. The opportunity of ________ is offered only to college students graduating in 2009.

A. working in America    

B. traveling in America

C. positions in VW        

D. OPI internship

3. If you want to apply for assistant to the director positions you must ________. 

A. be good at document writing

B. study computer science

C. have communication ability

D. be familiar with various languages

《环境空气质量标准》中规定环境空气污染物SO₂监测年平均值要求( )。

A．(A) 每年至少分布均匀的144个日均值，每月至少有分布均匀的12个日均值

B．(B) 每年至少分布均匀的60个日均值，每月至少有分布均匀的12个日均值

C．(C) 每年至少分布均匀的60个日均值，每月至少有分布均匀的5个日均值

D．(D) 每年至少分布均匀的144个日均值，每月至少有分布均匀的5个日均值