2. 外语
  3. The ability to recognize specific individuals has profound implications for the evolution of complex social behaviors such as re

The ability to recognize specific individuals has profound implications for the evolution of complex social behaviors such as re

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问题     The ability to recognize specific individuals has profound implications for the evolution of complex social behaviors such as reciprocal altruism. Many researchers assumed that recognition of individuals, a phenomenon predominantly observed in laboratory studies of fish, might also operate extensively in free-ranging fish populations, where it could underpin complex interactions. In fact, evidence of individual recognition in free-ranging fish populations is equivocal. The possibility exists that for many species, individual recognition observed in the laboratory might be an artifact of experimental designs, which enforce prolonged interaction between individuals and which prevent the diluting effects on social structure of immigration into and emigration from the shoal, factors that in nature would erode group stability and prevent the learning of individual identities.
The passage is primarily concerned with
选项 A、resolving a controversy
B、describing a behavior
C、dismissing a theory
D、predicting a result
E、appraising an assumption
答案E
解析 本文通过实验室中鱼群的个体识别能力，推测出在野生鱼群中也能观察到个体识别的现象。但是后面的证据表明这种现象很少会发生，因此选项E正确。an assumption对应的是“野生鱼群可以看到个体识别”。C项dismiss的意思是“瞧不上、不理会、不考虑”，有偏见态度。
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