（）结构是一种较好的结构，因为它具有良好的孔性，水、肥、气、热协调，能同时满足作物的

阅读理解。

     Ten-year-old Barack Obama was one of only three black students at his school in Hawaii, US. He felt

very different from most other students. White girls wanted to touch his hair. A white boy asked him

whether his father ate people.

     "I lied to them that my father was a Kenyan (肯尼亚) prince. But I kept asking myself who I am," said

Obama.

     However, 37 years later, the boy made history. Last Wednesday Obama became the first black president

in US history.

     Obama was born in 1961, to an African father and a white American woman from a small town in the

US. He grew up in Indonesia and Hawaii. This unusual background made him wonder who he was. He once

turned to alcohol (酒精) to help forget this question.

     With help from his friends, Obama finally turned his life around at college. His hard work made him a

star at Harvard (哈佛大学). Later, he became only the third black senator (参议员) in US history.

     During his race to the highest post in the US, Obama talked about his background. He called for a United

States of America, rather than a white America or a black America.

     "Obama's success has made Martin Luther King's dream come true. That is: A man should not be judged

(判断) by the color of his skin, but by the content of his character," wrote ABC news.

1. When Barack Obama was young, _______.

A. his unusual background made him wonder who he was

B. boys and girls all liked him very much

C. his father was a Kenyan prince

D. he felt the same as most other students

2. ________, Obama became the first black president in US history.

A. In his thirties

B. At the age of 47

C. When he was 37

D. In his teens

3. What does this sentence "Obama's success has made Martin Luther King's dream come true" mean?

    It means_______.

A. a man should not be judged by the color of his skin

B. a man should nor be judged by the content of his character

C. a man should not be judged by the color of his skin, but by the content of his character

D. Martin Luther King could decide everything

男，50岁，患十二指肠溃疡在内科治疗一个月，三天来呕血，便血不止，每日需输血1000ml，才能维持血压，应（）

A.继续输血，给止血剂，待血压稳定后手术

B.继续输血，静脉滴注甲氰咪胍

C.观察2~3日，仍有出血再手术

D.继续输血的同时急症手术

E.胃肠减压，同时注入冰水、肾上腺素止血

支气管扩张常见痰液性状为（）

A.白色泡沫痰

B.黄色脓痰，久置分层

C.铁锈色痰

D.粉红色泡沫痰

E.砖红色胶冻状痰

在盈亏平衡分析中，可变成本有以下（）项的特点。

A．单位产品随时间而变

B．单位产品可变成本随产量增加而减小

C．单位产品中可变成本部分固定不变

D．可变成本总额不随产量变化而变化

在基于TCP/IP的互联网服务中，传输层的UDP协议提供进程之间 (6) 报文传输服务，TCP协议提供进程之间 (7) 报文传送服务。TCP使用三次握手协议建立连接、传输报文，使用修改的三次握手协议来关闭连接。关闭连接时，设甲乙两方发送报文的序号分别为X和Y，甲方发送 (8) 的报文给乙方，乙方先发送一个 (9) 确认报文给甲方，并通知应用指示后再发送一个 (10) 的报文给甲方，最后甲方回送一个ACK_Y+1确认报文。

A．FIN=1，序号=X

B．FIN=1，序号=X，ACK_Y+1=1

C．序号=X，ACK_Y+1

D．ACK_Y+1(注：ACK的下标为捎带的序号)