党的十七大将“基层群众自治制度”首次纳入中国特色政治制度范畴。目前，我国的“基层

下列哪一项是发现血小板无力症的最简便的试验（）

A.血涂片上血小板分散不堆集

B.血小板聚集试验减低，但对瑞斯托霉素有反应

C.血块收缩不良

D.出血时间延长

E.单克隆抗体证实缺乏GPⅡb／Ⅲa

我市某化工厂用废钢铁和稀硫酸生产硫酸亚铁．在一定量的稀硫酸中不断加入废钢铁，下列图象中正确的是（　　）

A．

B．

C．

D．

第三部分阅读理解（共15小题，每小题2分，共30分。）

阅读下列短文，从每题中的A、B、C、D四个选项中，选出最佳答案。

A NATIONWIDE BESTSELLER

It’s likely that everything you learned about America’s ancient history is wrong.

The new book, 1491, completely changes our understanding of the Americas before the arrival of Columbus in 1492.

DID YOU KNOW?

When Columbus landed there were probably more people in the Americas than there were in Europe.

The peoples of North America had such healthy life-styles that as late as the 19th century they continued to be the tallest people on earth.

Facts have shown that the Americas were populated as long as 33,000 years ago.

4,000 years ago Mesoamerican farmers developed corn in a feat (技艺) of genetic engineering that still isn’t completely understood.

COMMENTS ON 1491

“In the tradition of Jared Diamond & John McPhee, a totally new view of pie-Columbian America”                                                    --Richard Rhodes

“Attractively written and really absorbing ... Charles C. Mann has produced a book that’s part detective story, part epic (史诗) and part tragedy. He has taken on a vast topic: thousands of years, two huge continents, and cultures.”

-- Charles Matthews, San Jose Mercury News

“Powerful and challenging”

--Alan Taylor, Washington Post

“A pleasure to read as well as a wonderful education”              -- Howard Zinn

56. On the whole, 1491 is a book mainly about America’s_______ .

A. life-styles       B. population       C. history         D. agriculture

57. Which of the following is NOT TRUE about the comments on the book 1491 ?

A. It is interesting and instructive.        B. It is attractive and culturally related

C. It is challenging and revolutionary.     D. It is humorous and persuasive.

58. From this passage, we can learn______ .

A. people settled in the Americas a little earlier than 1492

B. North Americans were the tallest in the 18th century in the world

C. Mesoamerican farmers knew genetic engineering 5,000 years ago

D. the population in the Americas was smaller than that in Europe in 1492

发电机开始转动后，即应认为发电机及其全部设备均已带电，此时禁止在（）回路上进行工作。

以下关于增强子的叙述错误是（）

A.增强子决定基因表达的组织特异性

B.增强子是远离启动子的顺式作用元件

C.增强子作用无方向性

D.增强子在基因的上游或下游均对基因的转录有增强作用

E.增强子只在个别真核生物中存在，无普遍性