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问题 选择题

设Sn为等差数列{an}的前n项和，若a1=1，公差d=2，Sk+2-Sk=24，则k=（　　）

A．8

B．7

C．6

D．5

答案

根据题意：

Sk+2=（k+2）2，Sk=k2

∴Sk+2-Sk=24转化为：

（k+2）2-k2=24

∴k=5

故选D

单项选择题

The first and most important agents of socialization are the people who care for infants. In the earliest months, messages from nurturers constitute the child’s basic understanding of the world around it. This is the infant’s first introduction to the language that shapes perception and elicits emotion.
Another powerful source of information and socialization is the friendship of peers. Peers are equals that one can deal with on the same level as oneself, whereas parents are superiors. The heavy emotional overlay of family relationships makes some kinds of learning difficult.
Much formal socialization is placed in the hands of professionals. Teachers from kindergarten on are specifically designated agents of socialization. Ideally, a teacher is one who has both knowledge and the skills to present it. During the course of teaching their subjects, classroom instructors provide role models and attempt to convey the excitement of learning itself.
In earlier times, parents, friends and teachers would comprise the list of primary childhood socializers. Children’s books, comics and magazines might also have been mentioned as sources of information on norms and role models. Today one must add three powerful indirect or non-personal socialization agents: radio, movies and television. Many people learn about politics, form a vision of well-being, and develop attitudes towards others from what they see on the screen and hear through the speakers.

The author’s chief agents include the following EXCEPT the ______.

A．family

B．group

C．school

D．internet
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多项选择题

项目人力资源管理的任务主要包括（　　）等。

A．团队建设

B．管理与项目有关的所有人员

C．组织项目管理班子人员的获取

D．编制人力资源规划

E．进行项目与外界组织的协调

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