阿摩線上測驗
43. According to the passage, what triggers the gender change in the blackspot angelfish?
(A) Dangers to the group.
(B) Changes in the fish’s diet.
(C) The birth of young angelfish.
(D) The death of the male fish in a group.
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統計： A(32), B(32), C(29), D(379), E(0) #1945518
統計： A(32), B(32), C(29), D(379), E(0) #1945518
