人教版高中英語版必修三unit2healthyeating第2課時強化練習(編輯修改稿)
2025-01-04 22:03 本頁面
【文章內(nèi)容簡介】 I have to stay at home preparing my lessons. — But you ________ . Tomorrow is Sunday. 4． Mike39。s father is ill, but you ________ tell him, because he is to take an important examination. 5． — It ________ be that naughty boy crying outside. — It ________ be him, because he has gone to school. 6． — ________ I finish the task right now? — Yes, you________. 7． You were out enjoying yourself when you ________ have been studying. 8． If you are busy now, you don39。t ________ e with us. 答案： not to/mustn39。t to 39。t/don39。t have to 39。t ； can39。t ； must 7． ought to to Ⅲ. 閱讀理解 A 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 petitors. “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 5173。10% smaller than its next largest petitor. 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 5173。10% of the size of its larger petitor, it causes a fight which usually ends in the smaller goby being driven away from the group. More often than not, the evicted fish is then eaten 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 petitors small. While the habits
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