57. What is the correct sequence of the following four events during an animal's development?
(A) 4 → 3 → 2 → 1
(B) 4 → 3 → 1 → 2
(C) 3 → 4 → 1 → 2
(D) heterotrophy

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統計： A(0), B(1), C(5), D(1), E(0) #2765620

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