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People diet to look more attractive. Fish diet to avoid being beaten up, thrown out of their social group, and getting eaten as a result. That is the fascinating conclusion of the latest research into fish behavior by a team of Australian scientists.
The research team have discovered that subordinate fish voluntarily diet to avoid challenging their larger competitors. “In studying gobies we noticed that only the largest two individuals, a male and female ，had breeding(繁殖) rights within the group, ”explains Marian Wong. “All other group members are nonbreeding females, each being 5～10% smaller than its next largest competitor. We wanted to find out how they maintain this precise size separation.”
The reason for the size difference was easy to see. Once a subordinate fish grows to within 5 10% of the size of its larger competitor，it causes a fight which usually ends in the smaller up.
It appeared that the smaller fish were keeping themselves small in order to avoid challenging the boss fish. Whether they did so voluntarily，by restraining how much they ate, was not clear. The research team decided to do an experiment. They tried to fatten up some of the subordinate gobies to see what happened. To their surprise，the gobies simply refused the extra food they were offered，clearly preferring to remain small and avoid fights, over having a feast.
The discovery challenges the traditional scientific view of how boss individuals keep their position in a group. Previously it was thought that large individuals simply used their weight and size to threaten their subordinates and take more of the food for themselves，so keeping their competitors small.
While the habits of gobies may seem a little mysterious, Dr.Wong explains that understanding the relationships between boss and subordinate animals is important to understanding how hierarchical (等级的) societies remain stable.
The research has proved the fact that voluntary dieting is a habit far from exclusive to humans. “As yet, we lack a complete understanding of how widespread the voluntary reduction of food intake is in nature，” the researchers comment. “Data on human dieting suggests that，while humans generally diet to improve health or increase attractiveness, rarely does it improve longterm health and males regularly prefer females that are fatter than the females‟ own ideal.”
[语篇解读] 人们节食是为了更有魅力。令鱼类专家们惊奇的是有种鱼也要节食。实验发现它们节食可不是为了美，而是为了自我保护。如果身体大小吸引到竞争者的注意，会有被殴打、驱逐，最后被吃掉的危险。
1.When a goby grows to within 510% of the size of its larger competitor, it________.
A. faces danger
B. has breeding rights
C. eats its competitor
D. leaves the group itself
[解析] 推理判断题。从第三段可得知如果身体大小超过权威的规定范围，会有被殴打、驱逐最后被吃掉的危险。
[答案] A
2.The underlined words “the evicted fish” in Paragraph 3 refer to ________.
A. the fish beaten up
B. the fish found out
C. the fish fattened up
D. the fish driven away
[解析] 猜测词义题。从本段前文可知，体积超标的鱼会被赶出鱼群。接着说到，不仅如此，这些鱼往往会被吃掉。这些鱼一定是指被驱逐的鱼。
[答案] D
3.The experiment showed that the smaller fish________.
A. fought over a feast
B. went on diet willingly
C. preferred some extra food
D. challenged the boss fish
[解析] 事实细节题。从第四段中的试验可得知这些鱼是自愿节食。 [答案] B
4.What is the text mainly about?
A. Fish dieting and human dieting. B. Dieting and health. C. Human dieting. D. Fish dieting.
[解析] 主旨大意题。文章通篇都是围绕鱼的节食来叙述。故选D。 [答案]D
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