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KEY→P39
范畴:人与自然 主题:自然生态 体裁:说明文 难度:★★★ 建议用时:8分钟 评价：/9
阅读下面短文,根据所读内容,在文章后的空格里填入最恰当的内容。注意:第1~8题每个空格只填1个单词,第9题字数不限。
Welcome to the Amazon rainforest. As the largest rainforest in the world, it plays an important role in keeping the balanced ecosystem(生态系统) on the earth. With an area of around 6 million square kilometres, the Amazon rainforest is more than half the size of China. This area has a great many species(物种). Actually, one in ten known species in the world can be found here.
Of the 390,000 plant species known to us, more than 40,000 can be found in the Amazon. There are different levels in the forest. At the bottom is a system of roots under the ground. Above that is leaf litter on the dark forest floor. The next level is made up of shorter plants with large leaves. Then there are the towering ancient hardwoods, and finally the tops of the trees which are taller than any other level of trees in the forest. Each level of the forest forms its own little world, home to different kinds of living things.
More than 1,300 species of birds and over 400 species of mammals(哺乳动物) hide among the forest's plant life. This jaguar is one example. While a large number of jaguars survive here, they are only one part of this forest's food chain(食物链). They feed on at least 87 species, including frogs. These frogs, in turn, feed on insects which eat leaves and fruit.
The Amazon rainforest is a treasure house of species that can be used for food or medicine. What's more, the Amazon rainforest breathes life into the planet by producing over 20 percent of all the earth's oxygen(O₂). So it is often known as the "lungs of the planet".

The Amazon rainforest
Introduction
The Amazon rainforest is the largest rainforest in the world, which helps keep the 1. of the earth's ecosystem.
Species
Plant species
Number: over 2. species
Different levels in the forest:
• the bottom: a system of 3.
• the second level: leaf litter
• the third level: shorter plants with large 4.
• the fourth level: towering ancient hardwoods
• the top: the tops of the 5. trees
6. species
Number: more than 1,300 species of birds and over 7. species of mammals
One of the food chains in the forest:
leaves and fruit→8. →frogs→jaguars
How do you understand the underlined sentence "What's more, the Amazon rainforest breathes life into the planet by producing over 20 percent of all the earth's oxygen(O₂)."? Explain it in your own words.
9.
英语嗨吧

本文主要介绍了亚马逊雨林里的物种。
1. balance 2. 40,000 3. roots 4. leaves 5. tallest
6. Animal 7. 400 8. insects 9. The Amazon rainforest produces 20% of the earth's oxygen which makes plants, animals and humans live.（言之有理即可）

【分析】本题是英语阅读理解填空题，解题思路为：首先通读全文，把握文章关于亚马逊雨林生态的主旨；然后针对每个空格，结合空格前后的提示，回到原文定位对应信息，提取准确内容，注意第1~8题需填写1个单词，第9题需结合划线句含义用自己的话解释。
【解析】1. 根据第一段“it plays an important role in keeping the balanced ecosystem”，可知此处填balance；2. 根据第二段“more than 40,000 can be found in the Amazon”，可知填40,000；3. 根据第二段“At the bottom is a system of roots under the ground”，可知填roots；4. 根据第二段“shorter plants with large leaves”，可知填leaves；5. 根据第二段“the tops of the trees which are taller than any other level”，此处用最高级tallest；6. 后文介绍鸟类、哺乳动物，属于动物物种，故填Animal；7. 根据第三段“over 400 species of mammals”，可知填400；8. 根据第三段“These frogs, in turn, feed on insects which eat leaves and fruit”，食物链顺序为leaves and fruit→insects→frogs→jaguars，故填insects；9. 划线句意为亚马逊雨林产生地球20%以上的氧气，为地球生命提供必要支持，解释为：The Amazon rainforest produces over 20% of the earth's oxygen, which is essential for the survival of all living things on the planet.
【答案】1. balance 2. 40,000 3. roots 4. leaves 5. tallest 6. Animal 7. 400 8. insects 9. The Amazon rainforest produces over 20% of the earth's oxygen, which supports the life of all living things on the earth.
【知识点】英语阅读理解、词汇填空
【点评】本题围绕亚马逊雨林的生态主题，考查学生的阅读理解与信息定位能力，题目设置贴合文本内容，难度适中，能有效考查学生对文本细节的掌握程度。
【难度系数】0.5