One way that scientists (科学家) learn about man...

One way that scientists (科学家) learn about man is by studying animals．In this lab, the scientists are studying the relationship between diet and health．

They are studying the relationship between the amount (数量) of food the mice eat and their health．The mice are in three groups．All three groups are receiving the same healthy food．The first group is eating one cup of food each day, the second group is eating two cups, and the third group is eating three cups．

After three years, the healthiest group is the one that is only eating one cup of food each day．The mice in this group are a little thinner. But they are more active．Most of the day, they are running, playing with one another．Also, they are living longer．Mice usually live for two years．Most of the mice in this group are still alive after three years．

The second group of mice is healthy, too．They are active, but not as active as the thinner mice．They are only living about two years．

The last group of mice is receiving more food than the other two groups．Most of the day, these mice are eating or sleeping．They are not very active．These mice are living longer than the scientists thought－about a year and a half．But they are not healthy．They are sick more often than the other two groups．

1.People give each group of the mice _______ amount of food every year.

A. a different　　 B. the same　　 C. a small　　 D. a large

2.The experiment (实验) lasted for at least _______ years．

A. one and a half　　 B. two　　 C. two and a half　　 D. three

3.The underlined word “they” in the second paragraph refers to _______.

A. the scientists　　 B. the mice in the first group

C. all the mice　　 D. the mice in the last group

4.The best title for the passage is ________．

A. Man and health　　 B. Diet and animals

C. Diet and health　　 D. Animals and human beings

5.The result of the experiment mainly shows that ________．

A. eating less may bring longer life

B. the mice eat more than the scientists thought

C. the mice live longer than the scientists thought

D. the more exercise you take, the healthier you will be

九年级英语阅读单选中等难度题查看答案及解析

Scientists have long believed one way to stop the Earth’s air from warming is by planting more trees. The idea is that more trees will take in or absorb(吸收) some of the CO2 in the air. CO2 is a gas released by cars, factories and other human activities. The gas traps heat in the Earth’s air, which warms the planet. However, two new studies have found that trees may not be as helpful in reducing CO2 as thought.

The first study was done at Duke University in Durham, North Carolina. Researchers pumped(打气) extra CO2 into a test area where green trees were growing. The trees grew thirty-four percent faster during the first three years. However, in time, the trees slowed to about their normal growth rate. The scientists say this is because trees need other nutrients(营养素), such as nitrogen(氮).

In the second study, researchers from Duke and Bowdoin College in Brunswick, Maine examined the soil(泥土) around trees. They discovered that as the leaves broke down into the soil, all the carbon was not trapped in the soil. Much of it was let into the air as CO2.

The findings of the two studies were published last month in Nature magazine. They suggest there is limited(有限的) value in planting trees to reduce the CO2 pollution in the air.

Forest planting has been a part of negotiations(谈判) on a world agreement to reduce greenhouse gases that scientists believe cause global warming. The United States, Canada, Japan and some other countries have supported the idea. But this new research suggests the idea is not as effective as environmental activists(积极分子) had thought. Scientist Ram Oren of Duke University led the study on tree growth. He says that earlier estimates(估计) on the ability of forests to absorb CO2 were overly hopeful.

Some other scientists say the research provides some of the first evidence on how trees react(反应) to CO2. Some other scientists say the research disputes(质疑) a belief among some coal and power companies. The companies say that more CO2 in the air will not create harmful global warming. Instead, they say it will increase forests and other plants.

1.Why did the researchers put trees in extra CO2 in the first study?

A. To learn whether trees can still absorb CO2 under extreme conditions.

B. To get more oxygen from these trees.

C. To know how much CO2 that trees can absorb.

D. To see the effect of CO2 on the growth rate of these trees.

2.What happened to the leaves falling from the trees in the second study?

A. They broke down and the main parts turned into oxygen.

B. They broke down and the carbon had mainly turned into CO2.

C. They broke down and the carbon was mainly absorbed in the soil.

D. They absorbed more CO2.

3.Scientist Ram Oren thinks that common beliefs of the tree’s ability to absorb CO2 are __________.

A. just right　　 　　　　 B. not acceptable

C. a bit too cheerful　 D. too dangerous

九年级英语阅读理解中等难度题查看答案及解析

This is _______ one-hour documentary that is recorded by _____80-year-old scientist.

A.an; an B.a; an C.an; a D.a; a

九年级英语单选题简单题查看答案及解析

Scientists study the world and learn about things using a process called the scientific method(方法). By asking important questions and16the answers, it is possible to make amazing discoveries! Sometimes a scientist is17to answer his own questions, but if he has taken good notes another scientist may come along later who is able to use new knowledge to answer it.

When you use the scientific method to18an experiment, you start by making observations(观察) about something that19you. Based on your observations, you make a hypothesis. This is using20you know to make a smart guess about what you think could happen. Then you are ready to begin your experiment. All21your experiment you take down notes, which are22   experiment date(资料). You are constantly making observations during this time. You may make discoveries that cause you to improve your experiment as you go.23, you conclude your experiment and begin to look over your notes to decide what it all means. Based on what you have learned, you make a final statement about 24your hypothesis was correct or not. You have to have reasons and evidence to support what you are saying.

Using the scientific method can be difficult, but rewarding. Because all the steps are organized in a process, the25are more valid(可信的). When you provide observations as evidence to support what you are saying, your ideas are more likely to be accepted.

1.                A．waiting for      B．searching for     C．worrying about D．complaining about

2.                A．unable         B．sure           C．ready    D．surprised

3.                A．read           B．refuse          C．prevent  D．conduct

4.                A．hurts          B．represents      C．interests  D．attacks

5.                A．what           B．when          C．why D．which

6.                A．without         B．including        C．except   D．during

7.                A．controlled      B．arranged        C．called    D．carried

8.                A．Obviously       B．Suddenly        C．Finally    D．Mostly

9.                A．whether        B．what           C．how D．when

10.               A．problem        B．results         C．services   D．aims

九年级英语完型填空中等难度题查看答案及解析

完形填空

Scientists study the world and learn about things using a process called the scientific method. By asking important questions and　　 　　 the answers, it is possible to make amazing discoveries! Sometimes a scientist is　　 　　 to answer his own questions, but if he has taken good notes ,another scientist may come along later who is able to use new knowledge to answer it.

When you use the scientific method to　　 　　 an experiment, you start by making observations(观察) about something that　 　　 you. Based on your observations, you make a hypothesis(假设）. This is using 　 　　 you know to make a smart guess about what you think could happen. Then you are ready to begin your experiment. All　　 　 your experiment you take down notes, which are　 　 　 experiment date(资料). You are constantly(不断地） making observations during this time. You may make discoveries that cause you to improve your experiment as you go.　　 　 　 , you conclude your experiment and begin to look over your notes to decide what it all means. Based on what you have learned, you make a final statement about 　 　　 your hypothesis was correct or not. You have to have reasons and evidence to support what you are saying.

Using the scientific method can be difficult, but worthy. Because all the steps are organized in a process, the　　 　 　 are more valid(可信的). When you provide observations as evidence to support what you are saying, your ideas are more likely to be accepted.

1.A. waiting for　　 B. searching for　　 　 C. worrying about　　 D. complaining about

2.A. unable　　　　 　 B. sure　　　　　　　　　　 C. ready　　　　　　　　 D. surprised

3.A. read　　　　 　 　 B. refuse　　　　　　　　 C. prevent　　　　　　 D. conduct

4.A. hurts　　　　 　 B. represents　　　　　　 C. interests　　　　 　 D. attacks

5.A. what　　　　　 　 B. when　　　　　　　　 　 C. why　　　　　　　　　 D. which

6.A. without　　　　 B. including　　　　　　 C. except　　　　　　　 D. during

7.A. controlled　　　 B. decided　　　　　　 　 C. called　　　　　　 D. carried

8.A. Firstly　　　　　 B. Suddenly　　　　　 　 C. Finally　　　　　　 D. Mostly

9.A. whether　　　　 B. what　　　　　　　　　 C. how　　　　　　　　 D. when

10.A. problem　　　　 B. results　　　　　　　　 C. services　　　　　 D. aims

九年级英语完形填空中等难度题查看答案及解析

Stonehenge is one of the oldest places made by man. It took about 700 years to build the oldest part of it is now believed to be 4,800 years old. It is located in the south of England near a small town called Amesbury in an area which has many other ancient monuments.

Stonehenge consists of several circles. Some of them are made of stone, one is a ditch(沟渠)and one consists of 56 holes in the ground called “Aubrey holes”. Because many of the stones have fallen over or have been moved, it is difficult to see the full shape. The outside circle of stones once had 30 enormous (巨大的) stones, each weighing about 25 tons. On top of them used to be 30 more weighing 7 tons each, so that they made a circle of huge arches (拱形).Inside this was a horseshoe shape of five even bigger arches in which each of the upright (直立的) stones weighed 45 tones. Inside this was a bluestone circle of 60 stones, then a bluestone horseshoe of 19 stones. Finally in the middle was an enormous stone called the altar (祭坛) stones. The bluestone came from some mountains in Wales, 385 kilometers away, and even the other stones came a distance of at least 50 kilometers. Carrying the 80 stones to form the main circles probably took several thousand men several years.

Nobody knows why it was built. It may have been a kind of church; it may have been a meeting place for the people who lived near. Some people say that it was a means of predicting the position of the sun, the moon and the stars. It has also been discovered that Stonehenge is located on some mysterious (神秘的)lines called “ley lines ” that seem to join together ancient buildings and places in England.

阅读短文，根据短文内容回答问题。

1.Where is Stonehenge?

_____________________________________________________

2.How long did it take to build Stonehenge?

_____________________________________________________

3.What is in the middle?

_____________________________________________________

4.Does anyone know for certain(肯定地) why it was built?

_____________________________________________________

5.What do you think of Stonehenge?

_____________________________________________________

九年级英语任务型阅读中等难度题查看答案及解析

----Fred is studying Chinese in one evening school.

---Is that true? He has 　　　　　　　　 told me about it.

A. ever　　　　　　 　 　 B. even　　　　　　　　

C. already　　　　　　 D. never

九年级英语单项填空简单题查看答案及解析

— I’ve learned a lot from the ________ given by Yao Ming.

— Yeah, me, too. He is really a man that we should look up to.

A.product B.address C.speech

九年级英语单选题中等难度题查看答案及解析

Paper is one of the most important products ever invented by man. The invention of paper meant that more people could be educated because more books could be printed. Paper provided an important way to communicate with knowledge.

Paper was first made in China about 2,000 years ago. In Egypt and the West, paper was not very commonly used before the year 1400. Paper was not made in southern Europe until about the year 1100. After that, the forest countries of Canada, Sweden, Norway, Finland, and the United States became the most important in paper-making. Today Finland makes the best paper in the world.

When we think of paper, we think of newspapers, books, letters, envelopes, and writing paper. So paper plays an important role in our lives.

Paper is very good for keeping you warm. Houses are often insulated with paper. You have perhaps seen homeless men sleep on a large number of newspapers. They are insulating themselves from the cold. In Finland, in winter it is sometimes 40 degrees below zero. The farmers wear paper boots in the snow. Nothing could be warmer.

1.What did the invention of paper mean? It meant ___________.

A．more people could be educated

B．more books could be printed

C．paper is one of the most important products

D．paper was invented by man

2.When was paper made in southern Europe?

A．Before 1100       B．After 1400         C．After 1100        D．Before 1400

3.Which country makes the best paper?

A．Norway           B．Canada           C．The United States   D．Finland

4.The underlined word “insulate” in the passage means ________ in Chinese.

A．远离             B．隔离             C．用……制成        D．包围

九年级英语阅读理解中等难度题查看答案及解析

Paper is one of the most important products ever invented by man. The invention of paper meant that more people could be educated because more books could be printed. Paper provided an important way to communicate with knowledge.

Paper was first made in China about 2，000 years ago. In Egypt and the West，paper was not very commonly used before the year 1400. Paper was not made in Southern Europe until about the year 1100. After that，the forestry countries of Canada，Sweden，Norway，Finland，and the United States became the most important in paper­making. Today Finland makes the best paper in the world. And it has the biggest paper industry in the world.

When we think of paper，we think of newspapers，books，letters，envelopes，and writing paper. So paper plays an important role in our lives.

Paper is very good for keeping you warm. Houses are often insulated (隔热) with paper. You perhaps have seen homeless men sleep on a large number of newspapers. They are insulating themselves from the cold. In Finland，in winter it is sometimes 40 degrees below zero. The farmers wear paper boots in the snow. Nothing could be warmer.

1.What did the invention of paper mean?

A. It meant more people could be educated.

B. It meant more books could be printed.

C. It meant paper is one of the most important products.

2.When was paper made in Southern Europe?

A. Before the year 2000.　　 B. After the year 1400.　　 C. After the year 1100.

3.Which country makes the best paper?

A. Norway.　　 B. Canada.　　 C. Finland.

4.What's the meaning of the sentence “Nothing could be warmer.”？

A. Books are warmer.　　 B. Newspapers are warmer.　　 C. Paper is the warmest.

5.What's the main idea of the passage?

A. The invention of paper.　　 B. The best paper.　　 C. The uses of paper.

九年级英语阅读单选中等难度题查看答案及解析