完形填空，阅读下面短文，掌握其大意，然后从每小题所给的A、B、C、D四个选项中，选出可以填入空白处的最佳选项。
People like dolphins because they are both lovely and clever. They have an 1 IQ (智商).
Dolphins can 'talk'. Scientists try to ‘talk' with dolphins, and the results make them 2. They find that dolphins 3 understand them so well.
4 animals enjoy playing, but dolphins like to make their games different. On a beautiful day in 1997, scientists on a beach 5 a little dog going into the sea. They were surprised to see the dolphins come up to the dog and then start throwing(扔) it into the air. The dog 6 the 'game' and kept playing with the dolphins for over an hour.
Dolphins live in a very different world from 7, but they are very good at our 'IQ tests(测试)'. For example, in the picture above, a dolphin jumps 8 the water when he hears a whistle noise(哨声). He does this because he will get a fish 9 an award.
There is 10 much to learn about these lovely friends.
