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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 (等級的) 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.”
[語篇解讀] 人們節(jié)食是為了更有魅力。令魚類專家們驚奇的是有種魚也要節(jié)食。實驗發(fā)現(xiàn)它們節(jié)食可不是為了美，而是為了自我保護。如果身體大小吸引到競爭者的注意，會有被毆打、驅逐，最后被吃掉的危險。
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] 推理判斷題。從第三段可得知如果身體大小超過權威的規(guī)定范圍，會有被毆打、驅逐最后被吃掉的危險。
[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] 猜測詞義題。從本段前文可知，體積超標的魚會被趕出魚群。接著說到，不僅如此，這些魚往往會被吃掉。這些魚一定是指被驅逐的魚。
[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] 事實細節(jié)題。從第四段中的試驗可得知這些魚是自愿節(jié)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] 主旨大意題。文章通篇都是圍繞魚的節(jié)食來敘述。故選D。 [答案]D
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