题目内容
There is a fish called the black spot angelfish,which can change from female (雌性) to male (雄性) . No,it cannot do it by simply wishing to become male. The change happens for a specific reason.
The angelfish live in groups. And each group has one male fish,which is blue in color,and four female fish,which are yellow in color.
The male angelfish is the strongest and largest member of the group. He is the one who protects and looks after the females and acts like their “safety guard”. When the male dies,the group needs a “safety 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? the changes take place. She begins behaving like a male. Two weeks later,black spots appear on her body. This shows that the change is complete. She is now completely male!
Another interesting fact about angelfish is that they make a special living in the fish world. Most of them act as “cleaners” for other fish. They pick parasites (寄生生物) and dead things from the body of other fish.
() 1. There are fish in the group of angellish.
A. 2 B. 3 C. 4 D. 5
() 2. The male angelfish is the member of the group.
A. strongest B. largest
C. biggest D. strongest and largest
() 3. It takes angelfish week(s) to change from the female to the male fish.
A. one B. two C. three D. four
() 4. The angelfish feed on .
A. grass B. parasites
C. dead things D. parasites and dead things
阅读提示：本文介绍了一种变性鱼，它们过群居生活，当唯一的雄性鱼死去的时候，群里最大的雌性就会变为雄性，它们以其他鱼身上的寄生物和坏死东西为食。
1. D细节理解题。由第二段中的第二句“And each group has one male fish,which is blue in color,and four female fish,which are yellow in color.”可知答案为 D.
2. D细节理解題。由第三段中的第一句“The male angelfish is the strongest and largest member of the group. ”可知答案为 D.
3. D细节理解题。由第四段中的第二、三句话可知，变性鱼完成变 性的过程需要三周的时间。可知答案为C.
4. D细节理解题。由最后一段中的最后一句“They pick parasites (寄生生物) and dead things from the body of other fish. ”可知答案 为D.
