Interesting as dolphins (海豚) are to scientists, it is their intelligence and sociability that have caught the popular imaginatio

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问题     Interesting as dolphins (海豚) are to scientists, it is their intelligence and sociability that have caught the popular imagination. Like whales, dolphins have a strong sense of family. A dolphin family is like a human family, but much larger.
    Dolphins seem to be among the most sociable of all living creatures. They enjoy playing with each other and also with the humans, with whom they come in touch. It is this characteristic that makes them so easy to train as star performers. Besides, they seem able to remember humans that they have met even when there is a long period of time between meeting.
    A sense of family and a spirit of cooperation appear to be very strong among all these marine animals. There are many recorded cases of dolphins supporting a sick animal on the surface of the water so that it will be able to breathe.
    Language has always been considered unique to human beings. It now seems that the cetaceans (鲸目动物) may be able to communicate with each other through sounds similar to a real language.
    Scientists are studying the behavior of the cetaceans, the sounds they send out and the physical characteristics of their brains in an effort to determine whether they really have the ability to communicate through language. It may prove that we’ll be able to establish real communication with another species for the first time.
What characteristics make dolphins easy to train as star performers?

选项 A、High intelligence.
B、Sociability.
C、Enjoying playing with each other and also with the humans, with whom they come in touch.
D、Being able to remember humans that they have met.

答案C

解析 文中第二段中提到,海豚喜欢彼此嬉戏,也喜欢同接触到的人类玩耍;正是由于这个特征,使它们很容易被驯服成表演明星。该句表明C正确。
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