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Some researchers claim that cetaceans-whales and dolphins-have culture, which the researchers define as the ability to learn from one another. Skeptics, however, demand clear evidence that cetaceans can acquire new behaviors through some form of social learning, preferably clear-cut instances of imitation or teaching. But such evidence is difficult to obtain. While few people doubt that captive cetaceans are adept at imitation or that they reproduce behaviors taught by researchers, biologists seeking insight into cetaceans` behavior in their natural habitats must rely on deduction rather than experiments. If members of a particular group share behaviors that do not result from genetic inheritance or environmental variation, then they have almost certainly learned them by watching, following, or listening to other animals.

The passage suggests which of the following about captive cetaceans?

AWhether they are engaged in social learning is a subject of disagreement among biologists.
BTheir ability to imitate new behaviors is more extensive than that of noncaptive cetaceans.
CThey exhibit few behaviors that have not also been observed in cetaceans in their natural habitats.
DThey appear to adopt new behaviors more quickly than noncaptive cetaceans.
EThey exhibit tendencies that suggest a capacity for the kind of behavior that qualifies as cultural.

E显示答案

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