I know that boy has the ability ________ the ...

I know that boy has the ability ________ the differences between the two pictures in a short time.

A. finds out　　 B. found out　　 C. finding out　　 D. to find out

九年级英语单选题简单题查看答案及解析

It may seem easy to say that plants and animals are different. Any child can tell the difference between  a tree and a dog. But those differences are far deeper than just what they look like. The cells (细胞) that plants are made up of are different. In other words, the cell wall of plants has something special.

First of all, it's important to find that not all plant cells have a cell wall. Besides, there are many differences of a cell wall based on the kinds of plant. The following is meant to be what a plant cell wall is  like.

The cell wall of a plant is on the outside of the cell membrane (膜). It is usually hard and cannot be bent easily, but the degree of flexibility (韧性) of the cell wall is different. It is based on the special use that the cell has in keeping the plant alive. Cells that make up the trunk of a tree are clearly less flexible than　 cells on a leaf.

Cell walls act in many ways. They serve to protect the plant. They provide support, as well as help in the movement of chemicals and wastes into and out of the cell.  More importantly, they control the water　 that goes in and out.  Plants must have good water controlling systems (系统), allowing them to keep water during dry seasons, and get rid of unnecessary water. Plants can't walk around to find water, so  being able to control water is very important.

So there you have it , what a plant cell wall is. Of course, there are many other things that are not talked about here. Knowing more about plant cell wails requires further study and research.

1.From the first two paragraphs we can find that _____.

A. all plants have a ceil wall　　　　　　　　　

B. plant cells and animal cells are the same

C. different kinds of plant have different cell walls

D. there are no differences between the cells of a tree and a dog

2.The underlined word "bent" in the passage is the closest in meaning to _____.

A. 变形的 　　 B. 防水的   　 C. 太阳灼伤的     　　 D. 表皮破损的

3.Cells in the trunk of a tree are _____ those on a leaf.

A. as flexible as             　　　　　　  B. not so flexible as

C. more important than                　　 D. less important than

4.What is the most important use of a plant cell wall?

A. To protect the plant.                　　　 B. To provide support.

C. To move chemicals and wastes.       D. To control the water.

九年级英语阅读理解困难题查看答案及解析

— Are you going to accept the offer?

— You bet! The pay is not that good, but ________, you know.

A.better late than never B.actions speak louder than words

C.it never rains but it pours D.a bird in hand is worth two in the bush

九年级英语单选题中等难度题查看答案及解析

Fear may be felt in the heart as well as in the head, according to a study that has found a link between the cycles of a beating heart and the chance of someone feeling fear.

Tests on healthy volunteers found that they were more likely to feel a sense of fear at the moment when their hearts are contracting(收缩) and pumping（向---送出） blood around their bodies, compared with the point when the heartbeat is relaxed. Scientists say the results suggest that the heart is able to influence how the brain responds to a fearful event, depending on which point it is at in its regular cycle of contraction and relaxation.

Sarah Garfinkel at the Brighton and Sussex Medical School said: "Our study shows for the first time that the way in which we deal with fear is different depending on when we see fearful pictures in relation to our heart."

The study tested 20 healthy volunteers on their reactions to fear as they were shown pictures of fearful faces. Dr Garfinkel said, "The study showed that fearful faces are better noticed when the heart is pumping than when it is relaxed. So our hearts can also affect what we see and what we don't see - and guide whether we see fear."

To further understand this relationship, the scientists also used a brain scanner(扫描仪) to show how the brain influences the way the heart changes a person's feeling of fear. "We have found an important mechanism by which the heart and brain ‘speak’ to each other to change our feelings and reduce fear," Dr Garfinkel said.

"We hope that by increasing our understanding about how fear is dealt with and ways that it could be reduced, we may be able to develop more successful treatments for anxiety disorders, and also for those for those who may be suffering from serious stress disorder."

1.What is the finding of the study?

A. fear has something to do with one's health.

B. fear is a result of one's relaxed heartbeat.

C. One's heart affects how he feels fear.

D. One’s fast heartbeats are likely to cause fear.

2.When are people more likely to feel a sense of fear ?

A. When the heartbeat is relaxed.

B. When their hearts are contracting.

C. When people are tired.

D. When people are happy.

3.The study was carried out by analyzing （分析）_______.

A. the time volunteers saw fearful pictures and their health conditions

B. volunteers' heartbeats when they saw terrible pictures

C. volunteers' reactions to horrible pictures and data form their brain scans

D. different pictures shown to volunteers and their heart-brain communication

4.Which of the following is closest in meaning to "mechanism" in Paragraph 6?

A. Order.           B. Machine.          C. Treatment.          D. System.

5.This study may be useful to _______.

A. treating anxiety and stress better

B. explaining the cycle of fear and anxiety

C. finding the sky to the heart-brain communication

D. understanding different fears in our hearts and heads

九年级英语阅读理解极难题查看答案及解析

Mr. Ellis is very old. He has seen many changes in his hometown. He knows that things are different now. But he never forgets the old days. He often talks about his favorite birds, the robins(一种小鸟— 知更鸟). “When I was a boy, these houses were not here. These were wild fields and tall trees. Every spring the robins would come. Thousands of them would fly up to the south. They spent the winter in the south. Some would build their nests(巢)in the trees near our houses. Then people started to cut down trees, and they built more houses. The robins stopped coming. They couldn’t build their nests near our houses because there were no trees.” “Now there are too many houses and too many roads. There are no places for the robins. They do not come any more.”

根据短文内容，判断正(T)误(F)。

1.Mr. Ellis often talks about his family.

2.The birds, the robins spent the winter in the south.

3.The robins built the nests in the trees.

4.Then people cut down trees because they wanted to build some houses.

5.From the passage we can know that there were many houses there in the old days.

九年级英语阅读理解中等难度题查看答案及解析

Mr. Ellis is very old. He has seen many changes in his home town.

He knows that things are different now. But he never forgets the old days. He likes to talk about them. He often talks about his favourite birds, the robins （一种小小鸟——鸫）. "When I was a boy, these houses were not here. There were wide fields and tall trees. Every spring robins would come. Thousands of them would fly up to the north from the south. They spent the winter in the south. Some would build their nests（巢）in the trees near our houses. Then people started to cut down trees, and they built more houses. The robins stopped coming. They couldn't build their nests near our houses because there were no trees."

"Now there are too many houses and too many roads. There are no places for the robins. They do not come any more."

1.Mr. Ellis often talks about________.

A. his old house　 B. the old days

C. his life now　　 D. his family

2.The birds, the robins, spent the winter in________.

A. the south　　　　　　 B. the west

C. the north　　　　　 D. the east

3.________ built the nests in the trees.

A. Mr. Ellis　　　　 B. Some people

C. The robins　　　　　 D. Some dogs

4. Then people________ trees because they wanted to build more houses.

A. cut down　　　　 　 　 B. planted

C. bought　　　　　 　　 D. watered

5.From the passage（短文）we can know that________.

A. Mr. Ellis likes his new life now

B. there were many houses there in the old days

C. the robins can make their nests without trees

D. Mr. Ellis is not happy with the changes there

九年级英语阅读理解中等难度题查看答案及解析

Mr. Ellis is very old. He has seen many changes in his home town.

He knows that things are different now. But he never forgets the old days. He likes to talk about them. He often talks about his favorite birds， the robins (欧洲的一种小鸟) ." When I was a boy. these houses were not here. There were wide fields and tall trees. Every spring the robins would come. Thousands of them would fly up to the north from the south. They spent the winter in the south. Some would build their nests (巢) in the trees near our houses. Then people started to cut down trees， and they built more houses. The robins stopped coming. They couldn't build their nests near our houses because there were no trees. ”

“Now there are too many houses and too many roads. There are no places for the robins. They do not come any more."

1.Mr. Ellis often talks about 　　　　　 .

A. his old house　　　　　　　　　　 B. the old days　　　　　　　　　 C. his life now

2.The birds， the robins， spent the winter in 　　　　　 .

A. the south　　　　　　　　　　　　 B. the west　　　　　　　　　　　 C. the north

3.From the passage we can know that 　　　　　 .

A. Mr. Ellis likes his new life now

B. the robins can make their nests without trees

C. Mr. Ellis is not happy with the changes there

九年级英语阅读理解中等难度题查看答案及解析

Mr. Ellis is very old. He has seen many changes in his home town.

He knows that things are different now. But he never forgets the old days. He likes to talk about them. He often talks about his favourite（最喜欢的）birds, the robins （一种小小鸟——鸫）.　 "When I was a boy, these houses were not here. There were wide fields and tall trees. Every spring robins would come. Thousands of them would fly up to the north from the south. They spent the winter in the south. Some would build their nests（巢）in the trees near our houses. Then people started to cut down trees, and they built more houses. The robins stopped coming. They couldn't build their nests near our houses because there were no trees."

　"Now there are too many houses and too many roads. There are no places for the robins. They do come any more（不再）."

1.Mr. Ellis often talks about________.

A. his old house　　　　                     B. the old days

C. his life now　　　　　                         D. his family

2.The birds, the robins, spent the winter in________.

A. the south　　　　　　                          B. the west

C. the north　　　　　　                         D. the east

3. ________ built the nests in the trees.

A. Mr. Ellis　　　　　　　                     B. Some people

C. The robins　　　　　　                     D. Some dogs

4. Then people________ trees because they wanted to build more houses.

A. cut down　　　　　　 B. planted　　　　　　　　 C. bought　　　　　　　　 D. watered

5.From the passage（短文）we can know that________.

A. Mr. Ellis likes his new life now

B. there were many houses there in the old days

C. the robins can make their nests without trees

D. Mr. Ellis is not happy with the changes there

九年级英语阅读理解中等难度题查看答案及解析

—Do you know that a 13-year-old English boy has done a nuclear experiment successfully?

—_______ unusual work he has done!

A. What an　　　　　     B. What a　　　　　     C. What　　　　　　　     D. How

九年级英语单项填空中等难度题查看答案及解析

-Do you know that there are many different ____ animals in the zoo?

—Yes,I do. And I also know that some of them are_____scaring.

九年级英语单项填空中等难度题查看答案及解析