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  3. People have wondered for a long time how their personalities and behaviors are formed. It is not easy to explain why one person

People have wondered for a long time how their personalities and behaviors are formed. It is not easy to explain why one person

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问题     People have wondered for a long time how their personalities and behaviors are formed. It is not easy to explain why one person is intelligent and another is not,【C1】______why one is cooperative and another is competitive.
    Social scientists are, of course, extremely interested in these types of questions. They want to explain why we possess certain characteristics and【C2】______certain behaviors. There are no【C3】______answers yet, but two distinct schools of thought on the matter have【C4】______. As one might expect, the two【C5】______are very different from one another, and there is a great deal of【C6】______between proponents (支持者 ) of each theory. The controversy is often【C7】______to as "nature vs. nurture".
    Those who support the "nature" side of the conflict believe that our personalities and behavior patterns are【C8】______determined by biological and【C9】______factors. That our environment has【C10】______. if anything, to do with our abilities, characteristics and behaviors is central to this theory. Taken to an extreme, this theory maintains that our behavior is predetermined【C11】______such a great degree that we are almost completely 【C12】______ by our instincts.
    Proponents of the "nurture" theory, or,【C13】______they are often called, behaviorists, claim that our environment is more important than our biologically based instincts in【C14】______how we will act. A behaviorist, B.F. Skinner, sees humans as beings whose behavior is almost completely【C15】______by their surroundings. The behaviorists’ view of the human being is quite mechanistic; they【C16】______that, like machines, humans【C17】______to environmental stimuli as the【C18】______of their behavior.
    【C19】______of these theories can yet fully explain human behavior. In fact, it is quite likely that the key to our behavior【C20】______somewhere between these two extremes. That the controversy will continue for a long time is certain.
【C13】
选项 A、how
B、what
C、as
D、that
答案C
解析 结构衔接题。分析该句可知，74 they are often called修饰的其实是其后的behaviorists，相当于一个非限制性的定语从句。四个选项中能引导非限制性定语从句的只有[C]as。
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