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  3. The most fundamental group to which a person belongs is the family. The institution of the family exists in almost every human c

The most fundamental group to which a person belongs is the family. The institution of the family exists in almost every human c

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问题     The most fundamental group to which a person belongs is the family. The institution of the family exists in almost every human culture. It is considered by behavioral scientists to be one of the oldest institutions in human history.
    The family unit serves many important functions. The performance of these functions is the reason for the family’s importance. Above all, the family serves as a mechanism of species survival.
    Families also have important economic functions. In primitive societies, the tasks of gathering food and providing shelter were divided among family members. Today, both husband and wife may work and share the duties of homemaking and child rearing.
    In addition to its survival and economic functions, the family gives its members social status. In many societies, a person is not considered a complete member until he has married and produced children. Finally, the family helps to meet the basic emotional needs of a person through the love and support received from parents, siblings (兄弟或姐妹)，and relatives.
As it is used in the second paragraph of the passage, the word "mechanism" means______.
选项 A、parts of an organism or system which work together
B、racial group united by language, religion, customs, etc.
C、the people living in one place, district or country, considered as a whole
D、a worker skilled in using or repairing machines or tools
答案A
解析 文中第二段说：“家庭作为组织单位发挥许多重要的功能。这些功能的执行是家庭重要性的原因所在。”由此我们可以分析出下句中“a mechanism of species survival”一定指的是家庭的一种功能，而“species survival”是“种群生存”的意思，那么我们可以推断出“mechanism”一词应为“机制、结构方式”的意思。
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