对冲基金具有的特点是( )。 A．投资效应的高杠杆性 B．投资活动的复杂性 C．筹资

患者男，50岁。2h前因突感胸闷，胸骨后疼痛就诊，心电图显示有急性前壁心悸缺血，收入院治疗。护理体检：神志清，合作，心率108次/分，律齐。

患者目前需满足的需要是（）

A.生理的需要

B.安全的需要

C.爱与归属的需要

D.尊重的需要

E.自我实现的需要

如图示，腋窝臂丛阻滞时，最常见阻滞不全为（）

A.尺神经

B.正中神经

C.桡神经和正中神经

D.尺神经和桡神经

E.桡神经和肌皮神经

耐火材大多数不是纯物质。

My Space and other Web sites have unleashed a potent new phenomenon of social networking in cyberspace, (1) at the same time, a growing body of evidence is suggesting that traditional social (2) play a surprisingly powerful and under-recognized role in influencing how people behave.

The latest research comes from Dr. Nicholas A. Christakis, at the Harvard Medical School, and Dr. James H. Fowler, at the University of California at San Diego. The (3) reported last summer that obesity appeared to (4) from one person to another (5) social networks, almost like a virus or a fad. In a follow-up to that provocative research, the team has produced (6) findings about another major health (7) : smoking. In a study published last week in the New England Journal of Medicine, the team found that a person’s decision to (8) the habit is ply affected by (9) other people in their social network quit—even people they do not know. And, surprisingly, entire networks of smokers appear to quit virtually (10)

For (11) of their studies, they (12) of detailed records kept between 1971 and 2003 about 5,124 people who participated in the landmark Framingham Heart Study. Because many of the subjects had ties to the Boston suburb of Framingham, Mass. , many of the participants were (13) somehow—through spouses, neighbors, friends, co-workers—enabling the researchers to study a network that (14) 12,067 people.

Taken together, these studies are (15) a growing recognition that many behaviors are (16) by social networks in (17) that have not been fully understood. And (18) may be possible, the researchers say, to harness the power of these networks for many (19) , such as encouraging safe sex, getting more people to exercise or even (20) crime.

12（）

A. made a companion

B. took advantage

C. took an attitude

D. had the best

报检出口食品或食品添加剂，应提供《进出口食品标签审核证书》。 ( )