题目内容
A dolphin（海豚）is always well-known as a clever and friendly animal. Recently another amazing（令人惊奇的）discovery made by the British marine（海洋的）biologist (生物学家) Alexis shows that dolphins, to our surprise, keep in touch with each other by calling each other's names among themselves something like human beings.Alexis recorded over 1700 different kinds of dolphins' calls and made a careful analysis of them. The analysis shows each dolphin has his own sound signal referring specially to himself and used all the time when he gets in touch with others. What's more, one dolphin is even able to imitate another's cry in more or less the same way as sometimes human beings do while talking with birds, which is believed to be an important step towards language from animals' calls.问题1：Alexis's new discovery about dolphins is that they are famous.（）
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Mr Black had two cats. One was very big and ______ was quite small. He liked them very much. One day, Mr Green, a friend of his, came to see him. When he saw two holes______ the door--a large hole and a small one, he was surprised and said, "My dear friend, why______ two holes in your door?" "Let the cats in and out, of course," Mr Black answered."______ why are there two holes? Isn't one hole enough?" asked his friend."______ can the big cat go through the small hole?" he said.A. ButB. inC. the otherD. HowE. are there
The main idea of the text is a new discovery about the dolphin.
A dolphin is like a human being by speaking in a certain language.
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