脑干主要由（）、（）、（）和网状结构所组成。

现规定一种新的运算：a*b=5a-2b，如3*2=5×3-2×2=11，则4*（-2）=______．

妇科手术中不易损伤输尿管的部位是（）

A.骨盆漏斗韧带

B.卵巢固有韧带

C.子宫骶骨韧带

D.子宫动脉

E.主韧带

甲状腺的功能主要是（）

A.分泌甲状腺素

B.吸收甲状腺素

C.合成甲状腺素

D.吸收和合成甲状腺素

E.分泌和合成甲状腺素

扎根理论是指在经验资料的基础上建立理论，研究者在研究开始之前一般没有理论假设，直接从实际观察入手，从原始资料中归纳出经验概括，然后上升到理论。
根据上述定义，下列符合扎根理论的是( )。

A．某研究生为验证压力和成功之间的倒U形曲线关系，做了一项长达一年的实验，实验结果和预先判断并不一致，他认为实验设计可能存在问题
B．某教授通过对其女儿从3岁到7岁的连续观察研究，总结出了一些儿童认知发展的规律，但是这些结论在学术界还存在争议
C．某公司基于九型人格理论研制了一套人格测验，公司员工都进行了测试，测试结果和实际情况非常相近
D．某医疗机构通过问卷、访谈等形式来研究机器设备对医务人员和病人之间的互动影响，发现某些设备明显让病人感觉不舒服，于是改进了设备

In a democratic society citizens are encouraged to form their own opinions on candidates for public office, taxes, constitutional amendments, environmental concerns, foreign policy, and other issues. The opinions held by any population are shaped and manipulated by several factors: individual circumstances, the mass media, special-interest groups, and opinion leaders.

Wealthy people tend to think differently on social issues from poor people. Factory workers probably do not share the same views as white-collar, nonunion workers. Women employed outside their homes sometimes have perspectives different from those of full-time homemakers. In these and other ways individual status shapes one’s view of current events.

The mass media, especially television, are powerful influences on the way people think and act. Government officials note how mail from the public tends to "follow the headlines. " Whatever is featured in newspapers and magazines and on television attracts enough attention that people begin to inform themselves and to express opinions.

The mass media have also created larger audiences for government and a wider range of public issues than existed before. Prior to television and the national editions of newspapers, issues and candidates tended to remain localized. In Great Britain and West Germany, for example, elections to the national legislatures were usually viewed by voters as local contests. Today’s elections are seen as struggles between party leaders and programs. In the United States radio and television have been beneficial to the presidency. Since the days of Franklin D. Roosevelt and his "fireside chats," presidents have appealed directly to a national audience over the heads of Congress to advocate their programs.

Special-interest groups spend vast sums annually trying to influence public opinion. Public utilities, for instance, tried to sway public opinion in favor of nuclear power plants. Opposed to them were citizens’ organizations that lobbied to halt the use of nuclear power. During the 1960s the American Medical Association conducted an unsuccessful advertising campaign designed to prevent the passage of Medicare.

Opinion leaders are usually such prominent public figures as politicians, show-business personalities, and celebrity athletes. The opinions of these individuals, whether informed and intelligent or not, carry weight with some segments of the population. Some individuals, such as Nobel Prize winners, are suddenly thrust into public view by the media. By quickly reaching a large audience, their views gain a hearing and are perhaps influential in shaping views on complex issues.

It is obvious that the opinion of famous people（）

A.is often ignored by the public

B. is seldom expressed to the point

C. is often imposed on the public

D. has a p influence on people