In an

　　ongoing

　　study,

　　Slobodchikoff learns that their brain contains a very extensive vocabulary. He once used his best prairie dog sound to say coyote, and they just looked at him in anger as if he had said a bad word.

　　Ivy League Parrot

　　One African grey parrot Alex is said to have the cognitive abilities of a five­year­old child. Alex can identify 50 different objects, seven colors, five shapes, quantities up to six, and the concepts of bigger, smaller, same and different.

　　Also Alex is considered to make reasoned decisions. During an experiment, researchers gave Alex different­colored blocks in sets of two, three and six. When asked which color group had five blocks, Alex replied, “None.” And he answered the same in repeated tests. Obviously, he interpreted the concept of “none” as an absence of quantity all on his own. That's a lot like a high school student answering questions on a quiz show. 20. Which of the following is true?

　　A. Bailey is as clever as a child of five.

　　B. The prairie dog loves taking car rides.

　　C. The capuchin monkey is fond of painting.

　　D. Alex develops a communication system. 答案与解析：C　此题可用排除法。从文章第四部分介绍Ivy league parrot, 第一段可知parrot有5岁孩子的智商而不是Bailey排除A项；在第二部分Artistic Monkey Business第一段可知，Bailey喜欢坐车，排除B项；在第三部分Prairie Dog Sound第一段可知Prairie dogs有复杂的联系系统，排除D项。在第二部分第二段可知Bailey喜欢画画，故选C项。 21. The underlined word “coyote” in Paragraph 4 refers to ________.

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