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

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

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问题    People have wondered for a long time how their personalities and behaviors are formed. It’s not easy to explain why one person is intelligent and another is not, or 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 exhibit certain behaviors. There are no clear answers yet, but two distinct schools of thought on the matter have developed. As one might expect, the two approaches are very different from one another, and there is a great deal of debate between proponents of each theory. The controversy is often conveniently referred to as "nature/nurture".
   Those who support the "nature" side of the conflict believe that our personalities and behavior patterns are largely determined by biological and genetic factors. That our environment has little, if anything to do with our abilities, characteristics, and behavior is central to this theory. Taken to an extreme, this theory maintains that our behavior is predetermined to such a great degree that we are almost completely governed by our instincts.
   Proponents of the "nurture" theory, or, as they are often called, behaviorists, claim that our environment is more important than our biologically based instincts in determining how we will act. A behaviorist, B. F. Skinner, sees humans as beings whose behavior is al- most completely shaped by their surroundings. The behaviorists’ view of the human being is quite mechanistic; they maintain that, like machines, humans respond to environmental stimuli as the basis of their behavior.
   The social and political implications of these two theories are profound. In the United States, for example, blacks often score below whites on standardized intelligence tests. This leads some "nature" proponents to conclude that blacks are genetically inferior to whites. Behaviorists, in contrast, say that the differences in scores are due to the fact that blacks are often deprived of many of the educational and other environmental advantages that whites enjoy, and that, as a result, they do not develop the same responses that whites do.
   Neither of these theories can yet fully explain human behavior. In fact, it is quite likely that the key to our behavior lies somewhere between these two extremes. That the controversy will continue for a long time is certain.
In the United States, blacks score below whites on standardized intelligence tests. We think it probable that______.
选项 A、blacks are genetically inferior to whites
B、blacks don’t have the same opportunity for education as whites do
C、blacks and whites develop different responses
D、none of the above statements gives a satisfactory answer
答案D
解析 文章最后一段第一句说“Neither of these theories can yet fully explain human behavior．”由此可推断出，两个学派没有作出令人满意的解释。而[A]，[B]和[D]均为这两派的解释。故[D]为正确答案。
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