C. show that in fact humans are not so rational as known when making choices．

　　D. criticize the selfishness of human nature．

　　47. Choose the correct order of the steps for ants to move to a new place．

　　a. An ant finds an ideal hole with two main features．

　　b. The ants race back to carry the queen and larvae to move．

　　c. Another worker ant is brought to check it out．

　　d. Worker ants are sent out．

　　e. More ants come to the site until they have enough workers．

　　A. a-c-e-b-d

　　B. d-a-c-e-b

　　C. a-e-c-d-b

　　D. d-a-e-c-b

　　48．Which of the following options could be an appropriate decoy to the experiment in paragraph 5?

　　A. a dark nest with a small opening

　　B. a dark nest with a large opening

　　C. a bright nest with a small opening

　　D. a dark nest with a very large opening

　　49. According to Stephen Pratt, why are the ant colonies able to make the rational choice in comparison with humans?

　　A. They are not aware of more optional places．

　　B. They have clever worker ants to make the discoveries．

　　C. They are not well educated and intelligent as humans．

　　D. Ants are better at making collective choices with their ignorant partners．

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