精英家教网 > 高中英语 > 题目详情

Plants and animals usually do not live apart, as in many ways they are important to each other. Most green plants can make their own food. The food of other living things, even the food of meat-eating animals, comes directly or indirectly from green plants. For example, some people eat mutton (羊肉); mutton comes from a goat; the goats eat grass. These steps, or links, make up what is called a food chain. Without green plants, all other living things would in time die of starvation.

Plants help animals in other ways too. They furnish homes and shelter for many animals. Many birds, as you know, build their nests in trees. Deer and many other animals use bushes for shel­ter. And even man depends much upon plants for his shelter. Animals repay some of this debt by helping plants. You may be aware that many insects and some birds do important work for plants by pollinating (授粉) them. You must have also learned how animals often help plants by spreading seeds.

What is waste material for one of these kinds of life is often valuable substance for the other. For example, animals give off carbon dioxide gas when they breathe. When plants make food, they absorb this gas from the air, using the carbon and releasing some of the oxygen back into the air. The oxygen that is released, then, is again supplied to animals. Thus the cycle continues, ani­mals helping plants, and plants helping animals.

All plants and animals have their enemies. Insects eat plants; birds eat insects; other animals kill birds. But here too, animals such as birds and bats help the plants by destroying harmful in­sects. Many plants and animals are helpful to some living things but are harmful to others. Then there are other rules in nature that act as checks and balances. For example, if there are more animals in a certain area than there is food to support them, some of the animals must mi­grate or starve. In either case, the number of animals will be reduced until the balance between animals and the available food supply is restored.

These helps and hindrances (障碍) are constantly going on in the plant and animal world to achieve a balance. As long as one living thing is dependent on another, whenever the scales are tipped (使倾斜), nature takes steps to balance the scales again.

(Note: Answer the questions or complete the statements in NO MORE THAN TEN WORDS.)

81. What does the author mean by saying “Plants and animals usually do not live apart”?

82. Besides providing food and shelter for animals, plants can also ______ to help animals to live.

  

83. “Checks and balances” refers to ______ in the world of animals and plants.

84. What will be the final result if some animals migrate or starve for lack of food?

    

81. They are important to each other. / They depend on each other.

82. release oxygen

83. helps and hindrances that are going on

84. Their / Animal number will be reduced until the balance is restored.

 

练习册系列答案
相关习题

科目:高中英语 来源:2011届宁夏银川二中高三模拟英语卷(一) 题型:阅读理解

Probably you have seen photos of the Grand Canyon(峡谷), the great valley in the desert country of Arizona. But you must go there yourself to feel its true size and beauty. The Grand Canyon is one of the greatest natural wonders of the world
The Colorado River formed the Grand Canyon over millions of years. Slowly, the river cut down through hard rock. At the same time, the land was rising. Today the canyon is 1.5 kilometers and 445 kilometers long. The oldest rocks at the bottom of the canyon are more than 1 billion years old. The width varies from about 200 meters to 29 kilometers across. The rim or top of the canyon is about 2,300 meters above sea level on the South Rim, and about 3,000 meters on the other side. As a result, there are different kinds of plants and animals on opposite sides of the canyon. The South Rim is dry desert country. The North Rim has tall forests.
The canyon looks different at different times of day, and in different seasons and weather. At sunrise and sunset the red, gold, brown and orange colors of the rocks are especially clear and bright. In winter, the canyon is partly covered with snow.
The view from the South Rim of the Grand Canyon is the best. Most visitors come here and stay in campgrounds or hotels. Every point along the canyon’s edge offers a different view.
The North rim of the Canyon is quieter. It takes all day to drive there from the South Rim because there is only one bridge across the Colorado River. On the way, you go through Navado Indian lands, and a colorful pink desert called “The Painted Desert”.
【小题1】The best way to feel the true beauty of the Grand Canyon is to________.

A.see its photographsB.listen to the report about it
C.watch its introduction on TVD.go there yourself and visit it
【小题2】 The scene of the canyon is ________.
A.various depending on different time and places
B.almost the same
C.various depending on different time
D.various depending on different places
【小题3】 If you want to visit the North Rim from the South Rim, you________.
A.can go there in many directionB.won’t spend much time on the way
C.can visit The Painted Desert on the wayD.needn’t go across any bridges
【小题4】 If you want to have a visit to the Grand Canyon, you’d better go to _______.
A.the North RimB.the South RimC.the bottomD.Navado Indian Lands

查看答案和解析>>

科目:高中英语 来源:2010年山东省新泰一中北校区高一第一次月考英语卷 题型:阅读理解

Barbara and Barry Zucker – Pinchoff, both doctors from New York City, took their three daughters on a walking safari(旅行)last year in Tanzania. Barbara told about their experience in Kinbero, “It is the most remote(遥远的)place we have ever been to,” camping with a few other Americans, two Tanzanian guides, and several Hadza(哈扎人)who had time to sit and chat because they had just killed a giraffe.
About 400 members of the Eastern Hadza tribe(部落)live in Tanzania today, the only hunter-gatherers who remain in Africa. The Hadza hunt game, gather edible plants and honey, and move from place to place whenever the weather changers. Every two weeks or so, they move to a new campsite.
At the Pinchoffs’ campsite, three Hadza men stopped by to visit and ended up staying three days. One of the guides gave the men a cigarette. They took out the tobacco, put it in a pipe, and lit the pipe with fire they started.
It takes less than two hours for Hadza women to build a new camp. They make huts(茅屋)by bending branches into round structures about six feet high, and then covering them with long, golden grass. If the weather is very wet, the women may choose a dry cave to set up a camp. Some rock caves have been used over thousands of years and are decorated(装饰)with ancient rock paintings. Whether they sleep in huts, caves or in the open, the Hadza cover themselves only with thin cloths and depend on fire to keep them warm.
The Hadza refuse to be “settled” into villages or to have the life of farmers. By 1979, almost all of them had returned to their old ways. They Hadza may be the only tribe in Africa the has never paid taxes.
【小题1】 The passage mainly tells up         .

A.one of the author’s travel experiences
B.the life of the Hadza tribe in Tanzania
C.Barbara’s walking safari in Tanzania
D.the efforts of the Hadza to keep their old ways
【小题2】What does the underlined word “game” ( in Paragraph 2 ) probably refer to?
A.Part of a match.B.Edible wild animals.
C.An area of work.D.A children’s activity.
【小题3】What do we know about the life of the Hadza?
A.They change their campsites regularly.B.They live mainly on farming.
C.They keep warm using leaves at night.D.It takes them a long time to set up a camp.
【小题4】Where do the Hadza live in wet weather?
A.On the farm.B.In huts.C.In caves.D.In the open.

查看答案和解析>>

科目:高中英语 来源:2012-2013学年湖北省沙市中学高二下学期第二次周练英语试卷(带解析) 题型:阅读理解

“Soon, you’re going to have to move out!” cried my neighbor upon seeing the largest tomato plant known to mankind, or at least known in my neighborhood.
One tiny 9-inch plant, bought for $1.25 in the spring, has already taken over much of my rose bed, covering much of other plants, and is well on its way to the front door.
Roses require a good deal of care, and if it weren’t for the pleasure they give, it wouldn’t be worth the work. As it is, I have a garden full of sweet-smelling roses for most of the year. Bushes must be pruned(剪枝) in early spring, leaving ugly woody branches until the new growth appears a few weeks later. It was the space available in the garden that led me into planting just one little tomato plant. A big mistake.
Soil conditions made just perfect for roses turn out be even more perfect for tomatoes. The daily watering coupled with full sun and regular fertilizing have turned the little plant into a tall bush. The cage I placed around it as the plant grew has long since disappeared under the thick leaves.
Now the task I face in harvesting the fruit is twofold; First, I have to find the red ones among the leaves, which means I almost have to stand on my head, and once found I have to reach down and under, pick the tomatoes and withdraw(缩回) my full fist without dropping the prize so dearly won. I found two full-blown white roses completely hidden as I picked tomatoes in June. But they were weak and the leaves already yellow for lack of light.
Here I am faced with a painful small decision: To tear up a wonderful and productive tomato plant that offers up between ten and twenty ripe sweet tomatoes each day or say goodbye to several expensive and treasured roses. Like Scarlett in Gone With the Wind, I’ll think about that tomorrow.
【小题1】 What ate the requirements for the healthy growth of rose?

A.A lot of care and the right soil.
B.Frequent pruning and fertilizing.
C.Tomato plants grown alongside.
D.Cages placed around the roots.
【小题2】 The writer planted the tomato because ________.
A.it cost only $1.25
B.the soil was just right for it
C.there was room for it in the garden
D.the roses’ branches needed to be covered
【小题3】 This year the writer’s roses were _______.
A.removed from the rose bed
B.picked along with the tomatoes
C.mostly damaged by too much sunlight
D.largely hidden under the tomato plant
【小题4】 By saying “the prize so dearly won” in paragraph 5, the writer wants to _______.
A.show the difficulty in picking the tomatoes
B.show the hardship of growing the roses
C.express her liking for the roses
D.express her care for the tomatoes

查看答案和解析>>

科目:高中英语 来源:2012年人教版高中英语必修一Unit5练习卷(解析版) 题型:阅读理解

Language is always changing. In a society where life continues year after year with few changes, the language does not change either. The earliest known languages had difficult grammar but a small, limited vocabulary. Over the century, the grammar changed, and the vocabulary grew. For example, the English and Spanish people who came to America during the sixteenth century gave names to all the new plants and animals they found. In this way, hundreds of new words were introduced into English and Spanish vocabularies. Today life is changing very fast, and language is changing fast too.

There are several major(主要) language families in the world. Some scientists say there are nine main families, but other scientists divide them differently. The languages in each family are connected, and scientists think that they came from the same parent language. About 3 percent of the people in the world speak languages that are not in these major families.

1.The early language had ________.

A.a lot of problems

B.words and easy grammar

C.words but no grammar

D.grammar but not many words

2.In the next few hundred years we can expect language to _____.

A.stay exactly the same

B.change a great deal

C.change only a little

D.ask more words and drop some grammar

3.What this article shows is that _____.

A.languages change fast

B.languages really don't want to change

C.language really with changes in society

D.Spanish and English change

 

查看答案和解析>>

科目:高中英语 来源:2010-2011学年河北省保定市高三上学期摸底统考英语卷 题型:阅读理解

What do you see from a handful of seeds? Some see green plants, some see blooming flowers, or just seeds. But one group of Shanghai students saw an opportunity to make money.

Eight students from No 2 Secondary School Attached to East China Normal University started a virtual(虚拟的)company selling different seeds and seed products. They successfully sold 28 pictures pasted with different seeds at a campus auction(拍卖)a week ago. The company, which has recruited around 20 student staff members, has earned over 2000 yuan in the past three months.

“We donated part of the money to a poor school in the countryside of Anhui Province. It's great to realize our ideal of ‘spreading love and culture with seeds’ after many tests and lots of hard work,” said Senior 2 Shi Chen, CEO of the company.

Just like any other company, Shi's didn't develop smoothly. Shi and her young colleagues(同事)used to sell fresh flowers and old books, and later found seeds might be something that their company could engage in. They bought seeds of various plants and flowers at low prices from a local farm and sold them in schools or on streets. The creative students also made accessories and pictures with different seeds.

With little business knowledge, the students had to learn new skills as the leaders of different departments, such as public relations (PR), sales and marketing. They persuaded a joint Sino-French company near their school to give them training in business management.

“They helped us overcome our shyness. We also learned quite a lot of business theory. I found communication skills and teamwork are very important for my job” said Senior 1 Qian Yifei.

The 16-year-old was elected as PR manager thanks to her talent for speaking. She is also in charge of after sales service, dealing with complaints and providing suggestions.

As the head of the company, CEO Shi has a lot more to think about. First of all, she has to learn how to make her colleagues work efficiently(高效地) as the company only opens at weekends due to all their studies.

“It makes the company more formal,” she said.

1.The purpose of opening the company is to         .

A.earn money for their education fees.

B.spread love and culture with seeds.

C.see whether they can open a company.

D.collect money to open a Hope School.

2.According to Qian Yifei, what matters most in dealing with public relations?

A.Communication skills and teamwork 。

B.Creative and critical thinking.

C.Educational back ground.

D.Business theories.

3.What does the word "it" (in the last paragraph)  refer to?

A.Selling seeds.

B.CEO.

C.Every colleague's knowledge.

D.To make her colleagues work efficiently.

4.We can learn from the passage that____.

A.the company is owned by 20 students.

B.the company is over-night successful.

C.the company sells fresh flowers and old books

D.the company gets much help from other company selling seeds.

 

查看答案和解析>>

同步练习册答案