电缆通井器的过滤器是用来排出钻井液将（）保留在通井器管内的。A、泥饼 B、泥浆 C、

某同学分别用相同大小的纸张绘制了定陶第二中学地图、定陶县城区图、定陶县政区图、山东省政区图，请根据以上信息回答1~3 题。

1、这四幅地图中，反映内容最详细的是[ ]

A、山东省政区图

B、定陶城区图

C、定陶政区图

D、定陶第二中学地图

2、在以上四幅图中，量出图上距离相同的两地，通过比较可以看出实际距离最大的两地应位于上[ ]

A、山东省政区图

B、定陶城区图

C、定陶政区图

D、定陶第二中学地图

3、定陶第二中学位于定陶汽车站的东南方向，该同学根据通常采用的规定确定方向，那么在定陶城区图上，定陶第二中学应绘在定陶汽车站的[ ]

A、右上方

B、左下方

C、右下方

D、左上方

已知P（-1，2），则点P所在的象限为（　　）

A．第一象限

B．第二象限

C．第三象限

D．第四象限

（2011•北京）已知a²+2ab+b²=0，求代数式a（a+4b）﹣（a+2b）（a﹣2b）的值．

A San Francisco self-service laundry（自助洗衣店） may be one of the world’s most unusual places to surf the Internet but a fashionable club on Moscow’s Red Square is definitely the most fashionable, according to a Yahoo survey of the globe’s best cybercafés(网吧).

The winners of the first Yahoo Mail Internet Café Awards were published on Wednesday to mark the 10th anniversary(纪念日) of the world’s first cybercafé in London’s West End.

Among the top picks were the unusual Brain Wash in San Francisco, named as “the height of Internet café with self-service laundry” and Moscow’s Phlegmatic Dog, selected as Most Stylish with its “unique combination of comfort and hi-tech”. Taking the Best UK Internet Café award was Café Curve in Brighton, southern England—“a must for anyone who likes style, comfort, typing and keeping in touch”. And the title of the world’s Most Remote Internet Café went to an internationally funded centre in Timbuktu, Mali.

The winners were chosen by a team of judges who considered travelers’ more than 1,000 nominations(提名) of cybercafés in 111 countries. The results have been collected in a Rough Guides e-book.

In the decade since London’s Café Cyberia first opened its doors in 1994, approximately 20,000 Internet cafés have sprung up in 171 countries, according to Yahoo Mail.

“Despite the fact that home and work Internet access is now commonplace, Internet cafés fulfill the same role as they did 10 years ago,” Eva Pascoe, a co-founder of Café Cyberia, said in a statement. “They are the post offices of the wired generation.”

48. The purpose of Yahoo Mail Internet Café Awards is ______ .

A. to honor the 10th anniversary of Yahoo

B. to celebrate the rapid development of Internet cafés

C. to mark the 10th anniversary of London’s Café Cyberia

D. to promote the most fashionable club

49. Which is NOT the correct match of the following cybercafés?

A. Café Curve in Brighton—the Best UK Internet Café award

B. The internationally funded centre in Timbuktu — the   world’s   Most   Remote Internet Café

C. Moscow’s Phlegmatic Dog—the most fashionable

D. Brain Wash in San Francisco—combination of comfort and hi-tech

50. What does the last sentence “They are the post offices of the wired generation.” imply?

A. Internet surfers communicate with each other on Internet rather than by posting letters.

B. Internet cafes start the same service as post offices.

C. Post offices and Internet cafes are of the same importance to surfers.

D. Post offices turn to be Internet cafes in e-mail times.

在骨骼疾病的诊断酶学中下列哪项最有价值（ ）

A．LDH

B．CK

C．ALP

D．ACP

E．ALT