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We know that trees are useful in our everyday life. They give us many things, such as

wood, oxygen, rubber, medicines and many other things. They can __1__ tell us a lot about our climate. The following are the reasons. If you cut across a tree, you can see that it has many rings. Most trees grow one new ring __2__ year. Because of the reason, we know how old a tree is. A tree over a hundred years old means that it has more than a hundred __3__. When the climate is dry or very cold, the trees do not grow very much and their rings are usually thin. When it is wet and warm, the rings are much thicker. If the rings are suddenly very thin or suddenly very thick, this means that the __4__ changed suddenly. If we look at the rings on this tree, we can learn about the climate for a hundred years. We can see __5__ our climate is changing today.

1)、A.climate

B.rings

C.every

D.also

E.how

2)、A.climate

B.rings

C.every

D.also

E.how

3)、A.climate

B.rings

C.every

D.also

E.how

4)、A.climate

B.rings

C.every

D.also

E.how

5)、A.climate

B.rings

C.every

D.also

E.how

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更多“We know that trees are useful …”相关的问题

第1题

阅读理解：根据上下文，补全对话内容。A. So maybe we should avoid long traveling hours, and m

阅读理解：根据上下文，补全对话内容。

A. So maybe we should avoid long traveling hours, and make the trip a relaxing one.

B. Lakes always bring people peace and quiet.

C. Actually the boss told me to make plans for the trip.

D. One more thing, we need to make safety a priority.

E. There will be less traffic and fewer people there.

ZHANG HUA: Do you know that the senior members of our company were whispering about a short trip？

LIU HUI: Yes, I heard about it this morning. {A; B; C; D; E}.

ZHANG HUA: Really？ Then you will need to think hard about it.

LIU HUI: Sure. Since you are here, maybe you can help me work out some ideas.

ZHANG HUA: For a start, we need to bear in mind that many of them are about sixty years old.

LIU HUI: {A; B; C; D; E}.

ZHANG HUA: Right. What about the countryside？ {A; B; C; D; E}.

LIU HUI: That is an option. Besides, it's better to go to a place with a lake or river and hills covered with trees in the area.

ZHANG HUA: I like this idea. {A; B; C; D; E}.

LIU HUI: And they can either walk around the lake or take a boat for relaxation.

ZHANG HUA:{A; B; C; D; E}.

LIU HUI: Exactly. Thank you for your suggestions, I will work out an itinerary for the trip this afternoon.

ZHANG HUA: You're welcome.

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第2题

We will finish planting the trees ____________ two days.

A.for

B.after

C.on

D.in

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第3题

By cutting down trees we __________ the natural home of birds and animals.A. harmB. hurtC.

By cutting down trees we __________ the natural home of birds and animals.

A. harm

B. hurt

C. injure

D. damage

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第4题

We can use “see too many trees, but not the forest” for “cannot see the wood for the t

A.separation

B.omission

C.abbreviation

D.Extension

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第5题

We've planted （) trees in the center of our city this year.

A.two hundreds

B.hundred of

C.hundreds of

D.hundred

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第6题

We all know that DNA has the ability to identify individuals but, because it is inherited,

there are also regions of the DNA strand which can relate an individual to his or her family (immediate and extended), tribal group and even an entire population. Molecular Genealogy (宗谱学) can use this unique identification provided by the genetic markers to link people together into family trees. Pedigrees (家谱) based on such genetic markers can mean a break-through for family trees where information is incomplete or missing due to adoption, illegitimacy or lack of records. There are many communities and populations which have lost precious records due to tragic events such as the fire in the Irish courts during Civil War in 1921 or American slaves for whom many records were never kept in the first place.

The main objective of the Molecular Genealogy Research Group is to build a database containing over 100,000 DNA samples from individuals all over the world. These individuals will have provided a pedigree chart of at least four generations and a small blood sample. Once the database has enough samples to represent the world genetic make-up, it will eventually help in solving many issues regarding genealogies that could not be done by relying only on traditional written records. Theoretically, any individual will someday be able to trace his or her family origins through this database.

In the meantime, as the database is being created, molecular genealogy can already verify possible or suspected relationships between individuals. "For example, if two men sharing the same last name believe that they are related, but no written record proves this relationship, we can verify this possibility by collecting a sample of DNA from both and looking for common markers (in this case we can look primarily at the Y chromosome (染色体)," explains George Green, a member of the BYU Molecular Genealogy research team.

People in a large area may possess the same DNA thread because______.

A．DNA is characteristic of a region

B．they are beyond doubt of common ancestry

C．DNA strand has the ability to identify individuals

D．their unique identification can be provided via DNA

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第7题

回答{TSE}题： A Letter from Alan I have learnt of a plan to build three hundred houses on t

he landcalled Parson's Place by the football grounD．Few people know about this newplan to increase the size of our town. For me, Parson's Place is specialbecause it is a beautiful natural area where local people can relax -the smallwood has many unusual trees and the stream is popular with fishermen andbird-watchers. It's very quiet because there are few houses or roads nearby. I think that losing thisarea will be terrible because we have no other similar facilities in theneighbourhood. I am also against this plan because it will cause trafficproblems. How will the people from the new houses travel to work？ The motorwayand the railway station are on the other side of town. Therefore, these peoplewill have to drive through the town centre every time they go anywhere. The roads will always be full of traffic,there will be nowhere topark and the tourists who come to see our lovely old buildings will leave.Shops and hotels will lose business. If the town really needs more homes, theempty ground beside the railway station is a more suitable place. No doubt the builders will make a lot of money by selling thesehouses. But,in my opinion,the average person will quickly be made poorer bythis plan. As well as this,we will lose a very special place and our town willbe much less pleasant. I am going to the local government offices on Monday morning toprotest about this plan and I hope that your readers will join me there. Wemust make them stop this plan before it is too late. {TS}Why has Alan written this letter'？

A. To perersuade the government to build new houses.

B. To protest about a new motorway near the town.

C. To encourage more people in the town to use Parson's Place.

D. To inform. other people about the builders' plans.

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第8题

You know that some birds and bugs can fly. But did you know that there’s another anima

l that can do this？ It has wings like a bird. But it doesn’t look like a bird. It’s a bat.Bats have fur mostly all over, but not on their wings. Some bats have black, brown, red, or yellow fur. These live in dark places, like caves. Other bats live in trees. Many of these bats are part white and part another color. Some of them are green.There are more than 900 kinds of bats. The biggest ones are called flying foxes. Their heads look like little brown fox heads. The wings of these bats can be over 5 feet across. But other kinds can be very little. The wings of the smallest bats are only 1/2 foot across.In the day, bats hang by their feet and sleep a lot. At times they clean their fur. Some of the time they care for their babies. Mostly they sleep. But when the sun goes down, they begin to move. At night bats fly around. They try to find food. Bats eat fruit, bugs, plants, fish, and flowers.Some bats use their good hearing to find things in the dark. First they make sounds. The sounds jump off anything around the bats. Then these sounds come back, so the bats can hear just where the thing is. They can fly right to it. That’s how they find things to eat.

1.According to the passage a bat is ().

A.an animal

B.a plant

C.a bird

D.food

2.From the passage we know that ().

A.there are as many as 900 kinds of bats in the world.

B.Bats with brown and red fur live in trees, while bats with green fur live in caves

C.bats are blind but have good hearing

D.the wings of the biggest bats can be exactly 5 feet across

3.The word “flying fox” in paragraph 3 means ().

A.red foxes flying high

B.the biggest bat

C.a kind of fierce animal recently discovered

D.fox-like animals with big wings

4.According to the passage the way bats find food is ().

A.to fly around it at night

B.to jump off anything around them

C.as the same as that of most other animals

D.to use their good hearing in the dark

5.Which of the following is NOT true according to this passage？()

A.All dark bats live in the dark places.

B.In the day bats sleep a lot and look for foods at night.

C.Bats eat more fish and fruit than they eat bugs.

D.Bats can hang on the wall by their feet.

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第9题

There are a great many careers in which the increasing emphasis is on specialization. You

find these careers in engineering, in production, in statistical work, and in teaching. But there is an increasing demand for people who are able to take in a great area at a glance, people who perhaps do not know too much about any one field. There is, in other words, a demand for people who are capable of seeing the forest rather than the trees, of making general judgments. We can call these people "generalists". And they are particularly needed for positions in administration, where it is their job to see that other people do their work, where they have to plan for other people, to organize other people's work, to begin it and judge it.

The specialist understands one field; his concern is with technique and tools. He is a "trained" main and his educational background is properly technical or professional. The generalists and especially the administrators deal with people; his concern is with leadership, with planning, and with direction giving. He is an "educated" man; and the humanities are his strongest foundation. Very rarely is a specialist capable of being an administrator. And very rarely is a good generalist also a good specialist in a particular field. Any organization needs both kinds of people, though different organizations need them in different proportions. It is your task to find out, during your training period, into which of the two kinds of jobs you fit, and to plan your ca-leer accordingly.

Your first job may turn out to be the right job for you but this is pure accident. Certainly you should not change jobs constantly or people will become suspicious of your ability to hold any job. At the same time, you must not look upon the first job as the final job. It is primarily a training job, a chance to understand yourself and your fitness for being an employee.

There is an increasing demand for ______.

A．all round people in their own fields

B．generalists who are capable of making general judgment

C．people whose educational background is either technical or professional

D．specialists whose chief concern is to provide administrative guidance to others

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