80. What is the main reason for the zoo's rules and guidelines?
(A) To make the zoo more enjoyable for visitors.
(B) To keep the zoo clean and organized at all times.
(C) To limit visitors' interactions with the staff.
(D) To ensure both the safety of the animals and the well-being of the guests.
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統計: A(0), B(1), C(1), D(9), E(0) #3578149
統計: A(0), B(1), C(1), D(9), E(0) #3578149