Landscape design makes visitors to the Denver Zoo’s Predator Ridge exhibit feel like they’re really in Africa.

　　Animals in Predator Ridge can’t actually be mixed with one another, for safety reasons. But hidden deep channels and other smart features allow visitors to see all the animals at once. Different species can see each other too.

　　51. What is the passage mainly about?

　　A. The safety problem of zoos.

　　B. The living habits of zoo animals.

　　C. Changes of zoos over the time.

　　D. Protection of zoo animals.

　　52. Give the correct order of the following things according to time.

　　a. Different species were kept in a group.

　　b. Zoos were organized by species.

　　c. Natural environments were created in zoos.

　　d. Animals were kept in people’s gardens.

　　A. b; d; c; a

　　B. d; a; c; b

　　C. b; d; a; c

　　D. d; b; a; c

　　54. The underlined part “the region” in Paragraph 3 probably refers to _____.

　　A. the Denver Zoo B. the Predator Ridge exhibit

　　C. Africa

　　D. the ten-foot-tall mounds

　　55. We can learn from the passage that _____.

　　A. the earliest zoos were probably rich people’s gardens

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