登录
二、信息还原
阅读下面短文，从方框中选出能填入空白处的最佳选项。选项中有两项多余。
Welcome to the Amazon rainforest. As the largest rainforest in the world, it plays an important role in keeping a balanced ecosystem(生态系统) on earth. With an area of around 6 million square kilometers, the Amazon rainforest is more than half the size of China. This area has a great many species(物种). 1
Of the 390,000 plant species known to us, more than 40,000 can be found in the Amazon. 2 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. 3
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). 4 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 per cent of all the earth's oxygen (O₂). 5
1.
2.
3.
4.
5.
阅读下面短文，从方框中选出能填入空白处的最佳选项。选项中有两项多余。
Welcome to the Amazon rainforest. As the largest rainforest in the world, it plays an important role in keeping a balanced ecosystem(生态系统) on earth. With an area of around 6 million square kilometers, the Amazon rainforest is more than half the size of China. This area has a great many species(物种). 1
Of the 390,000 plant species known to us, more than 40,000 can be found in the Amazon. 2 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. 3
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). 4 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 per cent of all the earth's oxygen (O₂). 5
1.
F
2.
A
3.
G
4.
C
5.
D
答案
【文章大意】本文是一篇说明文。主要介绍了亚马孙雨林作为世界上最大的雨林，在维持地球生态系统平衡中的重要作用，以及其丰富的物种多样性。
1~5 FAGCD
1~5 FAGCD
解析
【分析】
这是一篇介绍亚马逊雨林的说明文类信息还原题，解题时首先通读全文梳理段落核心逻辑，再结合空格前后的上下文线索逐一匹配选项：
1. 第1空前文刚点明亚马逊区域物种数量极多，需要选择能承接“物种丰富”描述的佐证句；
2. 第2空后文开始按从下到上的顺序逐一介绍森林的不同结构层级，空格处需要总起句引出“森林存在不同层级”的核心表述；
3. 第3空前文已经把森林的所有层级列举完毕，后文开始介绍栖息在雨林里的各类动植物，需要选择承接层级介绍、引出不同生物栖息的过渡句；
4. 第4空前文提到美洲虎是雨林食物链的一部分，后文紧接着提到青蛙的食性，空格处需要同时关联美洲虎食性和青蛙的内容，衔接前后文；
5. 第5空前文提到亚马逊雨林产出地球超20%的氧气，空格处需要选择承接该特点的因果结论句。最后验证剩余的多余选项，确认无法匹配上下文逻辑后排除即可。
【解析】
1. 空1前句“This area has a great many species.”强调亚马逊雨林物种丰富，F选项“Actually, one in ten known species in the world can be found here.”用具体数据补充佐证物种多的特点，语义衔接自然，选F。
2. 空2后文依次介绍了地下根系、落叶层、低矮植物层、高大乔木层、树冠层等不同部分，A选项“There are different levels in the forest.”总起说明森林存在不同层级，引出下文对各层级的具体介绍，选A。
3. 空3前文已经完整列举完森林的所有层级，G选项“Each level of the forest forms its own little world, home to different kinds of living things.”承接层级的描述，说明每一层都有不同生物栖息，自然引出后文对鸟类、哺乳动物等生物的介绍，选G。
4. 空4前句说明美洲虎是雨林食物链的一部分，后句提到“这些青蛙以昆虫为食”，C选项“They feed on at least 87 species, including frogs.”中They指代前文的jaguars，既承接了食物链的表述，又引出了后文的青蛙相关内容，逻辑连贯，选C。
5. 空5前句提到亚马逊雨林产生地球超过20%的氧气，D选项“So it is often known as the “lungs(肺) of the planet”.”用因果关系承接产氧的特点，符合常识和文本逻辑，选D。
【答案】
1. F 2. A 3. G 4. C 5. D
【知识点】
说明文阅读 信息还原 逻辑衔接
【点评】
本题是典型的七选五阅读题型，解题核心是抓住空格前后的指代关系、总起分述关系、因果关系等逻辑线索，通过关键词对应就能快速匹配正确选项，干扰项和文本核心逻辑匹配度很低，容易排除。
【难度系数】
0.7
这是一篇介绍亚马逊雨林的说明文类信息还原题，解题时首先通读全文梳理段落核心逻辑，再结合空格前后的上下文线索逐一匹配选项：
1. 第1空前文刚点明亚马逊区域物种数量极多，需要选择能承接“物种丰富”描述的佐证句；
2. 第2空后文开始按从下到上的顺序逐一介绍森林的不同结构层级，空格处需要总起句引出“森林存在不同层级”的核心表述；
3. 第3空前文已经把森林的所有层级列举完毕，后文开始介绍栖息在雨林里的各类动植物，需要选择承接层级介绍、引出不同生物栖息的过渡句；
4. 第4空前文提到美洲虎是雨林食物链的一部分，后文紧接着提到青蛙的食性，空格处需要同时关联美洲虎食性和青蛙的内容，衔接前后文；
5. 第5空前文提到亚马逊雨林产出地球超20%的氧气，空格处需要选择承接该特点的因果结论句。最后验证剩余的多余选项，确认无法匹配上下文逻辑后排除即可。
【解析】
1. 空1前句“This area has a great many species.”强调亚马逊雨林物种丰富，F选项“Actually, one in ten known species in the world can be found here.”用具体数据补充佐证物种多的特点，语义衔接自然，选F。
2. 空2后文依次介绍了地下根系、落叶层、低矮植物层、高大乔木层、树冠层等不同部分，A选项“There are different levels in the forest.”总起说明森林存在不同层级，引出下文对各层级的具体介绍，选A。
3. 空3前文已经完整列举完森林的所有层级，G选项“Each level of the forest forms its own little world, home to different kinds of living things.”承接层级的描述，说明每一层都有不同生物栖息，自然引出后文对鸟类、哺乳动物等生物的介绍，选G。
4. 空4前句说明美洲虎是雨林食物链的一部分，后句提到“这些青蛙以昆虫为食”，C选项“They feed on at least 87 species, including frogs.”中They指代前文的jaguars，既承接了食物链的表述，又引出了后文的青蛙相关内容，逻辑连贯，选C。
5. 空5前句提到亚马逊雨林产生地球超过20%的氧气，D选项“So it is often known as the “lungs(肺) of the planet”.”用因果关系承接产氧的特点，符合常识和文本逻辑，选D。
【答案】
1. F 2. A 3. G 4. C 5. D
【知识点】
说明文阅读 信息还原 逻辑衔接
【点评】
本题是典型的七选五阅读题型，解题核心是抓住空格前后的指代关系、总起分述关系、因果关系等逻辑线索，通过关键词对应就能快速匹配正确选项，干扰项和文本核心逻辑匹配度很低，容易排除。
【难度系数】
0.7
