若a，b为有理数，则下列说法中正确的是[ ] A．若a≠b，则a2≠b2 B．若

                                                                     Rentals

NYC. East 71st Street, Lexington/Park. $ 1,850; sunny, furnished studio apartment in New York City,

available for long-term rental. Info and photos, e-mail:centerperform@aol.com.

Vacation rentals: Florence, Piazza S. Croce, 2BR, large kitchen, living room, two bathrooms, fully

equipped, C 1,700 per month. For photos and details, contact p_ corsi@ yahoo. com.

Charming House-Florence & Todi, Italy. 3 bedrooms, fireplaces, garden, breathtaking views, parking.

Tel./fax:(+39) 055 229 8620; e-mail:georgetatge@libero.it.

Exchange

English Academic Seeks Exchange: house in London(Highgate) for NYC apartment, to accommodate

two. September-November, 2011. Contact marcus.giaquinto@ucl.ac.uk.

GreenSingles.com-Meet single book lovers who value green living, natural health, personal growth,

spirituality.www.greensingles.com.

Single Booklovers, established 1970. Find singles who enjoy reading, books, arts and culture.www.

singlebooklovers.com.

Positions Hunted

Experienced Researcher, in Geneva, having an elegant international level of personal assistance, both in

French and English, with good computer knowledge, willing to travel.

bdsmac@gmail.com.

Psychotherapy (心理治疗)

Child and Family Therapist offers help to make life at home happier and more harmonious.

Visit Rosaleen(Rusty) Horn at www.psychologytoday.com; (212) 799-0695.

Websites

Global Warming: the truth. It's the hard truth: we're done.www.irawrites.com.

LIT BITS: somewhere between the seminar room and the pub, we talk literature from surprising angles.

Listen for free at http://web.me.com/adamsmyth. Topics so far: food and literature; bad literature;

soccer and literature.

Books

BOOK SEARCH. Old, rare, and out-of-print books. Marsha J. Shapiro: 355 West 85th Street, Apt.

77, New York, NY10024; (212)595-4219; mshap 1024@aol.com.

Personals

Retired Architect, Upper East Side, kind-hearted, loves classical music, movies, cats, puns, and

crosswords. Seeks friendship with Manhattan lady for concerts, museums and traveling abroad.

(212)327-2422.

Adventuresome Spirit, companionable, very good looking blonde, easy-going. Slender, athletic,

photographer. Lively, generous. Loves being at home: cozying up with a book, cooking for friends.

Seeking athletic, fit, professional, man 58-78, curious to travel, explore the world. travelcuriosity 3@

gmail.com.(561)601-8202.

Accomplished Woman, great smile, healthy, very attractive, Cambridge academic, writer, fit, very sane,

interested in friendship with man, 60+, similar descriptors, for explorations. Hsms66@gmail.com.

1. If you want to rent a house in New York City, you can send an e-mail to        .

A. marcus.giaquinto@ucl.ac.uk              

B. p_corsi@yahoo.com

C. georgetatge@libero.it                    

D. centerperform@aol.com

2. The person with the email address of bdsmac@gmail.com wants to find        .

A. an experienced researcher to work with

B. someone to teach French and English

C.a job to work as an excellent assistant

D.a researcher willing to travel to Geneva

3. If you want to buy some out-of print books, you can dial        .

A. (617)661-3849                        

B. (561)601-8202

C. (212)799-0695                        

D. (212)595-4219

4. 65-year-old Douglas can't stand loneliness any more. He could get help from"     ".

A. Psychotherapy        

B. Personals      

C. Exchange        

D. Rentals

如图所示，物体重2000N，当它沿水平地面匀速运动时所受的阻力为240N，若不计滑轮的重、绳重与摩擦，使物体以1m/s的速度匀速前进，经过10s时间，拉力的大小F=______N，拉力的功率是______W．

通信网按运营方式分（）网和（）网

无论用工单位是否直接支付劳动报酬，劳务派遣人员的填报单位均为______。

A．劳务派遣单位
B．订立劳动合同的单位
C．户藉所在地行政单位 D．实际用工单位

属于急诊手术的是（）

A.胃癌根治术

B.胃、十二指肠溃疡的胃大部切除术

C.脾破裂

D.腹股沟疝修补术

E.胆囊切除术