共用题干Ecosystem1. The word “ecosystem” is short for ecological（生态的）system. An ecosystem is where living creatures expand within a given area. You can say that an ecosystem is the natural environment where biological organisms（生物）such as plants,animals and humans co-exist in this world. So naturally that includes you and me. Yes,we are all members of an ecosystem!2 .There are different kinds of ecosystems depending on the type of surface or environ-ment. Most are naturally made such as the ocean or lake and the desert or rainforest.Some are man-made or artificial to encourage co-habitation（同居）between living and non-living things in a monitored environment,such as a zoo or garden.3 .Plants make up the biggest group of biological creatures within an ecosystem,and that's because they are the natural food producers for everyone. Plants raised in the earth need air and collect sunlight to help them grow. When they grow,the plants and its fruits or flowers eventually become a source of food to animals,microorganisms（微生物）and even hu- mans,of course. Food is then converted to energy for the rest of us to function,and this hap-pens in a never-ending cycle until the living creatures die and break up back in the earth.4 .Ecosystems are the basis of survival for all living things.We depend on plants and ani-mals for food. In order for us to exist,we need to grow and care about other organisms. We also need to care for the non-living things within our environment like our air and water so we can continue living as a population. Since plants,animals and humans are all of various species（物种）,we all play a role in maintaining the ecosystem.5 .To preserve our ecosystems,we should stop using too much energy,which happens when we consume more than our share of resources. Humans should not disturb the natural habitat（栖息地）of plants and animals,and allow them to grow healthily for the cycle to con-tinue. Too many people in a habitat can mean displacement（搬迁）: imagine being thrown out of your home because there is no more space for everyone. Worse,overpopulation can also ru- in the environment and cause destruction of existing plants and animals.Plants are essential in an ecosystem because to other living creatures they are______.A: our share of resourcesB: a biological creatureC: a given areaD: the maintenance of the ecosystemE: the source of foodF: various species
共用题干
Ecosystem
1. The word “ecosystem” is short for ecological（生态的）system. An ecosystem is where living creatures expand within a given area. You can say that an ecosystem is the natural environment where biological organisms（生物）such as plants,animals and humans co-exist in this world. So naturally that includes you and me. Yes,we are all members of an ecosystem!
2 .There are different kinds of ecosystems depending on the type of surface or environ-ment. Most are naturally made such as the ocean or lake and the desert or rainforest.Some are man-made or artificial to encourage co-habitation（同居）between living and non-living things in a monitored environment,such as a zoo or garden.
3 .Plants make up the biggest group of biological creatures within an ecosystem,and that's because they are the natural food producers for everyone. Plants raised in the earth need air and collect sunlight to help them grow. When they grow,the plants and its fruits or flowers eventually become a source of food to animals,microorganisms（微生物）and even hu- mans,of course. Food is then converted to energy for the rest of us to function,and this hap-pens in a never-ending cycle until the living creatures die and break up back in the earth.
4 .Ecosystems are the basis of survival for all living things.We depend on plants and ani-mals for food. In order for us to exist,we need to grow and care about other organisms. We also need to care for the non-living things within our environment like our air and water so we can continue living as a population. Since plants,animals and humans are all of various species（物种）,we all play a role in maintaining the ecosystem.
5 .To preserve our ecosystems,we should stop using too much energy,which happens when we consume more than our share of resources. Humans should not disturb the natural habitat（栖息地）of plants and animals,and allow them to grow healthily for the cycle to con-tinue. Too many people in a habitat can mean displacement（搬迁）: imagine being thrown out of your home because there is no more space for everyone. Worse,overpopulation can also ru- in the environment and cause destruction of existing plants and animals.
Ecosystem
1. The word “ecosystem” is short for ecological（生态的）system. An ecosystem is where living creatures expand within a given area. You can say that an ecosystem is the natural environment where biological organisms（生物）such as plants,animals and humans co-exist in this world. So naturally that includes you and me. Yes,we are all members of an ecosystem!
2 .There are different kinds of ecosystems depending on the type of surface or environ-ment. Most are naturally made such as the ocean or lake and the desert or rainforest.Some are man-made or artificial to encourage co-habitation（同居）between living and non-living things in a monitored environment,such as a zoo or garden.
3 .Plants make up the biggest group of biological creatures within an ecosystem,and that's because they are the natural food producers for everyone. Plants raised in the earth need air and collect sunlight to help them grow. When they grow,the plants and its fruits or flowers eventually become a source of food to animals,microorganisms（微生物）and even hu- mans,of course. Food is then converted to energy for the rest of us to function,and this hap-pens in a never-ending cycle until the living creatures die and break up back in the earth.
4 .Ecosystems are the basis of survival for all living things.We depend on plants and ani-mals for food. In order for us to exist,we need to grow and care about other organisms. We also need to care for the non-living things within our environment like our air and water so we can continue living as a population. Since plants,animals and humans are all of various species（物种）,we all play a role in maintaining the ecosystem.
5 .To preserve our ecosystems,we should stop using too much energy,which happens when we consume more than our share of resources. Humans should not disturb the natural habitat（栖息地）of plants and animals,and allow them to grow healthily for the cycle to con-tinue. Too many people in a habitat can mean displacement（搬迁）: imagine being thrown out of your home because there is no more space for everyone. Worse,overpopulation can also ru- in the environment and cause destruction of existing plants and animals.
Plants are essential in an ecosystem because to other living creatures they are______.
A: our share of resources
B: a biological creature
C: a given area
D: the maintenance of the ecosystem
E: the source of food
F: various species
A: our share of resources
B: a biological creature
C: a given area
D: the maintenance of the ecosystem
E: the source of food
F: various species
参考解析
解析：文章第二段主要讲根据不同的表层类型和环境类型，有各种不同的生态系统。主题句之后就是介绍不同的生态系统。B项What Are Different Types of Ecosystems? （有哪些不同类型的生态系统？）符合本段主题，故选B。
文章第三段主要讲植物是生态系统中最大的群体，因为它要为所有生态系统的成员制造食物。地球上的植物需要空气和阳光的帮助才能生长，在生长过程中，植物及其果实和花朵最终变成动物、微生物和人类的食物来源，然后食物转化成能量使个体发挥功能，这个过程循环进行，直到生物死亡，在土壤中分解。E项How Does an Ecosystem Work?（生态系统如何运行？）符合本段主题，故选E。
文章第四段主要讲生态系统为所有生物提供最基本的生存模式。我们需要从动植物身上获得食物，我们也需要空气和水来继续生存。动植物和人作为不同的物种，在维持生态系统上都发挥着作用。F项Why Are Ecosystems Important?（生态系统为什么重要？）符合本段主题，故选F。
文章第五段主要讲为了保护生态系统，我们要停止过度使用能源，不应该扰乱动植物的栖息地，应该控制人口数量。A项What Can We Do to Help Protect Ecosystems?（我们能做些什么来帮助保护生态系统？）符合本段主题，故选A。
题干意为“在一个生态系统中，植物、动物和人类共同生活在一定地区。”文章第一段第三句指出，你可以说生态环境是生物，比如植物、动物、人类，共同生活的自然环境。C项a given area（一定地区）与原句意思相符，故选C。
题干意为“在一个生态系统中植物非常重要，因为对于其他生物来说，它们是食物来源。”文章第三段第一句指出，植物是生态系统中最大的群体，因为它要为所有生态系统的成员制造食物。E项the source of food（食物来源）与原句意思相符，故选E。
题干意为“植物、动物和人类在维持生态系统中都发挥作用。”文章第四段最后一句指出，植物、动物和人属于不同物种，我们在维持生态系统中都发挥作用。D项the maintenance of the ecosystem（生态系统的维持）与原句意思相符，故选D。
题干意为“为了保护我们的生态系统，我们应该只使用我们的那份资源。” 文章第五段第一句指出，为了保护生态系统，我们应该停止过度使用能源，除了我们的那份资源外不应该消耗别的资源。A项our share of resources（我们的那份资源）与原句意思相符，故选A。
文章第三段主要讲植物是生态系统中最大的群体，因为它要为所有生态系统的成员制造食物。地球上的植物需要空气和阳光的帮助才能生长，在生长过程中，植物及其果实和花朵最终变成动物、微生物和人类的食物来源，然后食物转化成能量使个体发挥功能，这个过程循环进行，直到生物死亡，在土壤中分解。E项How Does an Ecosystem Work?（生态系统如何运行？）符合本段主题，故选E。
文章第四段主要讲生态系统为所有生物提供最基本的生存模式。我们需要从动植物身上获得食物，我们也需要空气和水来继续生存。动植物和人作为不同的物种，在维持生态系统上都发挥着作用。F项Why Are Ecosystems Important?（生态系统为什么重要？）符合本段主题，故选F。
文章第五段主要讲为了保护生态系统，我们要停止过度使用能源，不应该扰乱动植物的栖息地，应该控制人口数量。A项What Can We Do to Help Protect Ecosystems?（我们能做些什么来帮助保护生态系统？）符合本段主题，故选A。
题干意为“在一个生态系统中，植物、动物和人类共同生活在一定地区。”文章第一段第三句指出，你可以说生态环境是生物，比如植物、动物、人类，共同生活的自然环境。C项a given area（一定地区）与原句意思相符，故选C。
题干意为“在一个生态系统中植物非常重要，因为对于其他生物来说，它们是食物来源。”文章第三段第一句指出，植物是生态系统中最大的群体，因为它要为所有生态系统的成员制造食物。E项the source of food（食物来源）与原句意思相符，故选E。
题干意为“植物、动物和人类在维持生态系统中都发挥作用。”文章第四段最后一句指出，植物、动物和人属于不同物种，我们在维持生态系统中都发挥作用。D项the maintenance of the ecosystem（生态系统的维持）与原句意思相符，故选D。
题干意为“为了保护我们的生态系统，我们应该只使用我们的那份资源。” 文章第五段第一句指出，为了保护生态系统，我们应该停止过度使用能源，除了我们的那份资源外不应该消耗别的资源。A项our share of resources（我们的那份资源）与原句意思相符，故选A。