孕妇和乳母每天要比正常成人增加的碘的摄入量是（） A.10μg B.50μg C.1

由于万有引力定律和库仑定律都满足“平方反比定律”，因此引力场和电场之间有许多相似的特性，在处理有关问题时可以将他们进行类比，例如电场中反映各点电场强弱的物理量是电场强度，其定义式为E=

E

q

，在引力场中可以有一个类似的物理量来反映各点引力场的强弱，设地球的质量为M，半径为R，地球表面处重力加速度为g，引力常量为G，如果一个质量为m的物体位于距地心2R的某点，则下列表达式中能反映该点引力场强弱的是（　　）

A．G

M

(2R)2

B．G

m

(2R)2

C．G

Mm

(2R)2

D．g/2

   Editor’s notes: AWL is well known for its dictionaries and English language teaching materials． Some readers have written in to ask us for the latest information on high quality books on English, so here we introduce two texts that aim to improve spoken English fluency．

Let’s speak （Beginner)

By Bev Dusuya, Naoko Ozeki and Kevin Bergman

ISBN: 962001359X

Speak Up（Pre-Intermediate)

By Bev Kusuya, Nako Zeki

ISBN: 0583338050

“Teach the students about your culture and help them talk about their own．” How often are these worthy goals kept from being achieved by the limitations of your beginner level learners? Students at all levels want to talk about culture．

Topics include food, shopping, sports, fashion, the roles of men and women, health, music, and many more．

These are all chosen from surveys of over 15,000 students about their own interests in cross-cultural communication．

“Let’s Speak” and “Speak Up” share a special but excellent way that allows all students to take part in．

The series has questions which start thinking and then help collect opinions about personal topics． Conversation practice is provided by ready to use （现成的)models of basic exchanges on the topic． Also, the cultural information presented in the series comes in the form of interesting, relevant（相关的）facts and ideas from other countries through listening tasks and Culture Quiz exercises．

Team activities in books provide lively problem solving games to enable sharing and comparison of cultural values．

“Let’s Speak” is fit for entry level students of all ages． “Speak Up” provides for the needs of higher level beginners, offering the same careful listening and speaking help, but with slightly more open ended discussion．

For any information about AWL’s books, please get in touch with the following addresses:

Beijing Addison Wesley Longman Information Center

Room 2306, FLTRP Beijing

19 Xi San Huan Beilu, Beijing 100081

Tel: （010)68917488 （010) 68917788

Fax: （010) 68917499E-mail: zrh@public．bat．net．cn

小题1:In the sentence “Teach the students about your culture and help them talk about their own”, “your culture” here means the culture of           ．

A．the English native speakers　

B．the English learners

C．the readers of the two books

D．the readers of the newspaper小题2:Which of the following are mentioned about the two books in the passage above?

a．publisher       b．titles          c．content         d．writers 

e．prices          f．pages           g．book number

A．a,b,d,f　

B．a,c,d,g

C．b,c,d,e

D．b,c,e,f小题3:The two books have in common everything EXCEPT         ．

A．the same interesting topics

B．the same level of learners

C．proper ways to excite the learners to talk

小题4:The passage above is probably taken from the            section in a newspaper．

A．EDUCATION

B．NEWS

C．ENTERTAINMENT

D．BOOKSHELF

机器人语言程序可以编译

下列关于栈的叙述中正确的是( )。

A．在栈中只能插入数据

B．在栈十只能删除数据

C．栈是先进先出的线性表

D．栈是先进后出的线性表

客户交易保证金不足，期货公司履行了通知义务而客户未及时追加保证金，客户要求保留持仓并经书面协商一致的，穿仓造成的损失，期货公司（）。

A．不承担责任

B．承担次要赔偿责任

C．承担主要赔偿责任，最高不超过80%

D．全部承担赔偿责任