Have you ever seen a person or an animal that changes from female to male? No, I don’t mean in the movies. A fish called the blackspot angelfish can really do so.The angelfish live in groups, and each group has one male fish and four female fish.       The male is different from the females in color. And he is the strongest and the largest member of the group. He protects the females and acts like their “security guard”. When the male dies, the group needs a new “security guard”. This is when the largest female fish in the group begins to change its appearance. She begins to grow larger in size. After a week, she starts changing color, from yellow to blue. Slowly, she begins to act like a male. Two weeks later, black stripes appear on her body. This shows that the gender change is done. She is now a male fish and the new leader of the group! 

female雌性 ； male雄性 ； protect保護 ； stripe條紋、斑紋 ； gender性別
【題組】32. What is the job of a male angelfish?
(A) He takes care of the baby fish.
(B) He changes color to protect himself.
(C) He is the leader and looks after the female fish.
(D) He looks for food.