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九年级英语（外研版）上册单元提升测试卷
Unit 5 A fine balance
（考试时间80分钟 满分：100分）
一、单项选择（共 10 小题，每小题 1 分，满分 10 分）
The ecosystem ______ is made up of plants and animals needs to stay in good balance.
A. who B. whose C. whom D. which
Human activities have a great ______ on the balance of nature.
A. influence B. ability C. difficulty D. difference
Trees play an important role in ______ the air fresh and clean.
A. keep B. keeping C. kept D. to keep
People have cut down too many trees, ______ many wild animals lose their homes.
A. leading to B. depending on C. sticking to D. giving up
We must protect the environment ______ being polluted by waste and smog.
A. for B. from C. with D. about
The rapid development of cities is ______ to some vulnerable wild ecosystems.
A. peaceful B. helpful C. valuable D. harmful
The clean water and fresh air ______ we need to live are parts of nature’s balance.
A. what B. who C. that D. where
If we want nature to ______ in balance, we must stop destroying wild land.
A. stay B. turn C. get D. take
Many endangered animals depend ______ the complete ecosystem to survive.
A. in B. on C. with D. for
Small green actions can ______ positive changes to our living environment.
A. bring B. take C. make D. give
二、完形填空（共 10 小题，每小题 1.5 分，满分 15 分）
Nature is a big system 11______ includes all living things and natural resources. It keeps a natural balance as long as humans do not destroy it. However, human activities have greatly changed our planet in recent years.
Every year, large numbers of trees are cut down for farmland and buildings. Such activities are harmful 12______ local ecosystems. They not only rob wild animals of their homes but also 13______ to serious air pollution and smog. Human behaviors have a great influence 14______ the living conditions of wild creatures.
Thankfully, more people have realized the 15______ of protecting natural balance. Forests, rivers and wildlife all play important roles 16______ keeping the earth healthy. Every part of nature matters, and small changes in one area can 17______ the whole ecosystem.
Now schools and communities encourage people to live a green life. We are taught to protect nature 18______ avoid wasting natural resources. Teenagers can also make a difference. By saving water, reducing waste and planting trees, we can help nature 19______ its natural balance.
Protecting nature is protecting ourselves. Only by living in harmony with nature can we have a 20______ future.
A. who B. which C. whom D. whose
A. to B. for C. with D. in
A. lead B. leads C. leading D. led
A. in B. at C. on D. of
A. importance B. difficulty C. difference D. suggestion
A. on B. at C. in D. for
A. effort B. effect C. afford D. affect
A. but B. and C. so D. or
A. keep B. take C. make D. turn
A. difficult B. dangerous C. terrible D. safer
三、阅读理解（共 15 小题，每小题 2 分，满分 30 分）
A
The Fine Balance of Nature
Nature consists of various living things and natural resources, and all parts work together to maintain a fine balance. Every plant and animal has its own place in the ecosystem, and none of them is useless.
In forests, small insects feed birds, while birds control the number of insects to prevent plants from being destroyed. Plants produce fresh oxygen and offer shelter for small animals. This natural cycle keeps the whole ecosystem healthy and stable.
However, human activities are breaking this balance. Cutting down trees, polluting rivers and overusing natural resources cause many environmental problems. Wildlife is disappearing, farmland is damaged and more ecosystems are facing great danger.
In recent years, more people have begun to pay attention to environmental protection. The government has made rules to reduce pollution, and many volunteers take part in tree-planting and wildlife protection activities. These efforts help nature return to its balanced state.
Natural balance is the basis of human survival. Protecting nature is protecting all living things on the earth, as well as our own future.
What does the natural ecosystem depend on to keep stable
A. Human endless development
B. More human activities
C. Constant pollution and change
D. The balanced cooperation of all living things
The underlined word “stable” in Paragraph 2 means ______.（词义猜测）
A. 脆弱的 B. 稳定的 C. 快速的 D. 危险的
Which of the following is NOT the result of breaking natural balance
A. Worse pollution B. Disappearing wildlife
C. Better ecosystem D. Damaged farmland
What is the writer’s attitude towards environmental protection （态度判断）
A. Supportive B. Doubtful C. Uninterested D. Worried and hopeless
What is the main idea of the passage （主旨归纳）
A. The types of wild animals in forests
B. How human activities destroy cities
C. The importance of natural balance and protection
D. The development of modern technology
B
Teenagers’ Green Actions Matter
Many students believe that environmental protection is a task for adults, scientists and the government. In fact, teenagers’ daily small actions also matter a lot and can positively influence the balance of nature.
Natural balance is easy to break but hard to repair. Wasting water, throwing rubbish casually and destroying young trees will damage local ecosystems. These small bad habits will finally cause serious environmental problems. On the contrary, daily green actions can gradually improve our living environment.
Many schools now hold environmental-themed activities. Students learn how ecosystems work and why natural balance is so important. They join tree-planting activities, learn waste sorting and experience low-carbon life.
These activities help students build environmental awareness. We begin to understand that nature is not unlimited resources for human use. We must live in harmony with nature and protect vulnerable ecosystems.
Small actions bring big changes. Teenagers’ long-term green efforts can effectively protect natural balance and make our planet better.
What do many teenagers think of environmental protection at first
A. It is everyone’s duty
B. It is only a task for professionals and governments
C. Small actions are helpful
D. It is easy to repair damaged nature
What bad effect will daily bad habits bring
A. Improve ecosystem balance
B. Reduce natural pollution
C. Help wild animals survive
D. Cause big environmental problems
What do school environmental activities help students do
A. Waste more natural resources
B. Understand the value of natural balance
C. Ignore ecological problems
D. Develop bad living habits
The underlined phrase “low-carbon life” means ______.（词义猜测）
A. 低碳环保生活 B. 高消耗生活 C. 快速节奏生活 D. 简约饮食生活
What is the best title for Paragraph B
A. The Dangers of Natural Pollution
B. How students break ecosystem balance
C. Teenagers’ small actions protect natural balance
D. The difficulty of environmental repair
C
Live in Harmony with Nature
The earth’s ecosystem is a complete system made up of land, water, air and all living creatures. It keeps a fine balance and supports all lives on the planet. But fast human development has greatly changed natural conditions.
Many people focus only on economic development and ignore ecological protection. They cut down forests for more land, pollute rivers with waste water and produce plenty of smog. These harmful activities destroy animals’ living environments and make many species endangered.
Environmental experts warn that broken ecological balance will finally harm humans. Dirty water and air cause illnesses, and lost forests lead to extreme weather. Humans cannot live well without a balanced nature.
It is never too late to protect the environment. We do not need great deeds. Long-term small green actions are enough. Saving water, using less plastic, protecting plants and choosing green travel are all easy and useful ways.
Living in harmony with nature brings us sustainable development. A balanced natural environment offers humans a stable and bright future.
What is the feature of the earth’s ecosystem
A. It is an independent and balanced whole system
B. It is easily destroyed by animal activities
C. It has no connection with human life
D. It can repair itself without any protection
Why do many wild animals become endangered
A. Because people protect them too much
B. Because there is enough natural resource
C. Because the ecosystem is too stable
D. Because human activities destroy their living environment
What will happen if nature balance is broken
A. Better living conditions B. Health risks and extreme weather
C. More wild species D. Cleaner environment
What does the writer advise people to do
A. Focus only on economic development
B. Ignore ecological problems
C. Take simple and lasting green actions
D. Use natural resources without limit
What is the main purpose of the passage
A. To introduce different kinds of wild animals
B. To warn people to protect natural ecological balance
C. To show the rapid development of society
D. To explain the formation of natural smog
四、语法填空（共 10 小题，每小题 1.5 分，满分 15 分）
Nature is a wonderful system 36______ keeps a fine balance for all living things. It 37______ (be) made up of forests, rivers, animals and plants. All natural things play important roles in 38______ (keep) our planet healthy.
Human activity is the main factor 39______ breaks natural balance. Cutting down trees and polluting water are 40______ (harm) to ecosystems. Such behaviors have a bad influence 41______ wildlife survival and leads 42______ more environmental problems.
Now more people realize the importance of 43______ (protect) nature. We should try our best to stop damaging the environment. Small green actions can help nature 44______ (return) to a balanced state. Let’s work together to build a greener and 45______ world.
36. ________ 37. ________ 38. ________ 39. ________ 40. ________
41. ________ 42. ________ 43. ________ 44. ________ 45. ________
五、任务型阅读（共 5 小题，每小题 2 分，满分 10 分）
阅读短文，完成表格，每空限填一词。
Protect Natural Balance, Protect Our Home
The natural ecosystem is a complete system that keeps balanced naturally, offering resources and living space for all living things. However, human activities easily break this balance and cause different kinds of environmental problems.
Large numbers of trees are cut down, which destroys wild animals’ homes. Waste water and smoke pollute water sources and air seriously. These bad behaviors greatly influence the ecological environment and make nature lose its balance.
To solve these problems, everyone should take responsibility. We need to prevent nature from being damaged, stick to low-carbon life and take small but useful green actions. Only in this way can we keep the ecosystem stable and enjoy a better living environment.
Ecological Problems Protective Ways
Trees are 46______ down widely Take 49______ of small green actions
Water and air are 47______ seriously Stick to 50______-carbon daily life
Nature loses its natural 48______ Protect nature and keep ecosystem stable
46. ________ 47. ________ 48. ________ 49. ________ 50. ________
六、书面表达（满分 20 分）
题目：Protect Nature, Keep Natural Balance
写作要求：
内容完整包含三点：①自然生态平衡的重要性；②人类破坏生态的常见行为与危害；③青少年保护环境、守护生态平衡的具体做法；
至少使用4个单元核心短语：stay in balance、be made up of、play an important role in、have an influence on、lead to、be harmful to（任选其四）；
语法要求：必须使用至少1个that/which引导的定语从句；
词数100-120，句式丰富、逻辑清晰，合理使用复合句与非谓语动词，不得出现真实校名、人名。
Protect Nature, Keep Natural Balance
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参考答案
一、单项选择
D ：which引导定语从句，先行词为事物ecosystem，从句作主语。
A ：have an influence on 对……有影响。
B ：play a role in doing sth. 在做某事中发挥作用，in后接动名词。
A ：leading to 导致，现在分词作结果状语。
B ：protect...from... 保护……免受……伤害，固定搭配。
D ：be harmful to 对……有害。
C ：that引导定语从句，可修饰并列事物先行词，在从句中作宾语。
A ：stay in balance 保持平衡，固定短语。
B ：depend on 依靠、依赖，固定搭配。
C ：make positive changes 带来积极改变，固定搭配。
二、完形填空
B 解析：先行词system为事物，which引导定语从句并作主语。
A 解析：be harmful to 对……有害。
B 解析：主谓一致，it指代前文整件事，谓语动词用第三人称单数leads。
C 解析：have an influence on 对……产生影响，固定搭配。
A 解析：realize the importance of 意识到……的重要性，贴合语境。
C 解析：play roles in doing sth. 在做某事方面起作用，固定用法。
D 解析：affect为动词，意为“影响”，符合句子谓语需求；effect为名词，不能作谓语。
B 解析：并列连词and，连接两个并列动作protect和avoid。
A 解析：keep balance 保持生态平衡。
D 解析：safer更安全的，守护自然能换来更安全的未来。
三、阅读理解
A篇21.D 22.B 23.C 24.A 25.C
B篇26.B 27.D 28.B 29.A 30.C
C篇31.A 32.D 33.B 34.C 35.B
四、语法填空
which/that（定语从句修饰事物system，在从句中作主语）
is（一般现在时，主语it为单数，谓语动词用单数形式）
keeping（介词in后接动名词形式）
which/that（定语从句修饰事物factor，在从句中作主语）
harmful（be harmful to 为固定搭配，意为“对……有害”）
on（have an influence on 固定短语，意为“对……有影响”）
to（lead to 固定搭配，意为“导致；引起”）
protecting（介词of后接动名词作宾语）
return（help...do sth. 固定用法，省略不定式符号to）
safer（and连接并列比较级，与greener对应）
五、任务型阅读
46.cut 47.polluted 48.balance 49.action 50.low
六、书面表达
Protect Nature, Keep Natural Balance
Nature is a complete system which is made up of plants and animals. It stays in natural balance and plays an important role in our life.
However, many human actions are harmful to nature. Cutting down too many trees and polluting water resources lead to ecological damage. This has a bad influence on our living environment and breaks the balance of nature.
As teenagers, we should take action to protect nature. We can save water, reduce rubbish and plant more trees in our free time. Small green actions can help nature stay in balance and make our world more beautiful.

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