Until now, scientists have understood playful acts help prepare animals for their serious adult situations. But the numbers of playful species and examples of animal play are vast. The purpose of animal play may have meanings scientists have not discovered yet.

　　1. The main purpose of the text is to ________.

　　A. ask us to take good care of wild animals

　　B. encourage us to learn more about animals

　　C. entertain us with interesting animal stories

　　D. show us something about animal behavior

　　2. The underlined word “nimble” in Paragraph 2 can best be replaced by “________”．A. cruel

　　B. swift

　　C. curious

　　D. strong

　　3. Which of the following belongs to predatory play？A. A deer runs, leaps, and turns.

　　B. A chimpanzee plays with a stick.

　　C. A lion moves slowly and makes an attack suddenly.

　　D. A dog holds its mouth in a relaxed and open manner.

　　4. Based on Paragraph 5, a “play face” is ________.

　　A. a type of signal between animals

　　B. a name for a kind of animal play

　　C. an activity that involves adult animals

　　D. an action that is taught to another animal

　　5. Which of the following shows the structure of the text？

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