Question

   There is a fish called the angelfish (神仙鱼), which can change from female to male. No,it cannot do it by simply wishing to I 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. When the male dies,the largest female fish in the group begins to change its looks. She begins to grow larger in size. After a week,she starts changing colors,from yellow to blue. Slowly,she begins looking like a male. Two weeks later,black stripes (条纹) appear on her body. She is now really male.

   The angelfish are among the most brightly colored fish of the sea. People prefer to keep them because of the interesting patterns (图案) on them. People like to keep them because of their good look. Often,the young ones are different in color from the old ones. At night their colors may change.

阅读短文，回答下列问题。

1. How many angelfish are there in a group?

2. What color are the female angelfish?

3. What do the angelfish first change when they change from female to male?

4. How long does it take the angelfish to change from female to male?

5. Why do people like to keep the anglefish at home?

Answer 1

  本文主要介绍了一种神奇的鱼——神仙鱼，它们可以 雌性变成雄性，它们的这种变换，不是意愿所决定的，是由生 存环境的变化来决定的。

1. Five.由第二段第二句可知，一个神仙鱼的小群体是由 一个雄鱼和四个雌鱼组成的。

2. They are yellow.由第二段第二句“••• and four female fish,which are yellow in color. ”可知，雌性鱼的颜色是黄色的。

3. Their size.由第三段第三句“She begins to grow larger in size. ”可知神仙鱼从雌性变成雄性先变体型。

4. More than two weeks.由第三段倒数第一、二句可知由 雌性变为雄性需要两周多。

5. Because they look nice.由第四段第二句“People like to keep them because of their good look. ”可知，人们在家词养神仙鱼是因为它们外观漂亮。