题目内容
（请给出正确答案）
[单选题]
For the frequency syntesizer using PLL shown below, what is the the relationship between the frequecies of the input and output signals.
A.
B.
C.
D.
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When people work, they gain a contributing place in society. The fact that what they receive pay for their work indicates that what they do is needed by other people and that what they are a necessary part of the social fabric. Work is also a major social mechanism for placing people in the larger social structure and for providing them with identities. In the United States, it is a blunt and ruthlessly public fact that to do nothing is to be nothing and to do little is to be little. Work is commonly seen as the measure of an individual.
Sociologist Melvin L. Kohn and his associates have shown some of the ways work affects our lives. Generally, people who engage in self-directed work come to value self-direction more highly, to be more open to new ideas and to be less authoritarian in their relationships with others. Moreover, they develop self-conceptions consistent with these values, and as parents they pass these characteristics on to their children. Our work, then, is an important socializing experience that influences who and what we are.
Traditionally, work for "self interest" would be interpreted to mean work for______.
A．selfish reasons
B．a feeling of satisfaction
C．earning a living
D．a contributing place in society
