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成都七中2020届高三零诊模拟考试英语试卷及答案(8)

时间:2019-07-12 19:47  作者:Edmond  来源:本站整理

第二节(共 10 小题;每小题 1.5 分, 满分 15 分) 

阅读下面材料,  在空白处填入适当的内容  (1 个单词) 或括号内单词的正确形式。 

Throughout history, people have thought of the ocean as a diverse and limit less source of food.  Yet today there is clear evidence that the oceans have a limit. Most of the big f ish in our oceans are now  61  (go). One major cause is overfishing. People are taking so many fish from the sea that many species cannot replace    62   (they). 

For centuries, local fishermen caught only enough fish for their own and their  community’s needs. However, from the  early  20th  century,  people  around  the  world  became  interested   63  consuming  protein-rich  foods.  People began  64  (catch) large quantities of fish for profit and selling them to worldwide markets. In a very short  period of time, commercial fishing  65   (great) reduced the number of large predatory fish, such as cod and tuna.  

Today, there  are  still  plenty  of  fish in the  sea,  66  they’re  mostly  just  the  little  ones.  Small  fish,  67   include sardines and anchovies, have more than doubled in number- largely because there are not enough big f ish  68   (eat) them. 

Such large  fish  69  (be)  necessary,  because they  hunt  and  kill the  sick  and  weak smaller  fish.  Without this weeding out, or survival of the fittest,  ecosystems become less stable.  As a result, fish are less able to survive   70  (difficult) such as pollution, environmental change, or changes in the food supply. 

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