It may seem easy to say that plants and anima...

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 then 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 our side 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 our. 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 walls requires further study and research.

1.The best title of the passage can be 　　　　　　 .

A. Different Plants 　　 B. Different Animals

C. The Plant Cell Wall D. The Uses of Cells

2. From the first two paragraphs we can find that 　　　　　　 .

A. all plants have a cell 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

3.The underlined word “bent” in the passage is the closest in meaning to 　　　　　　 .

A. shape-changed　　 B. water-kept

C. sun-burnt　 　　　 D. skin- broken

4. 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

5. 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.

八年级英语阅读理解中等难度题查看答案及解析

“If you want to see a thing well, reach out and touch it!”

That may seem a strange thing to say. But touching things can help you to see them better. Your eyes can tell you that a glass ball is round. But by holding it in your hands, you can feel how smooth and cool the ball is. You can feel how heavy the glass is. When you feel all these about the ball, you really see it. With your skin, you can feel better. For example, your fingers can tell the difference between two coins in your pocket. You can feel a little drop of water on the back of your hand, too. You can even feel sounds against your skin. Have you ever wanted to know why some people like very loud music? They must like to feel the sounds of music.

All children soon learn what “Don’t touch!” means. They hear it often. Yet most of us keep on touching things as we grow up. In shops, we touch things we might buy: food, clothes. To see something well, we have to touch it. The bottoms of our feet can feel things, too. You know this when you walk on warm sand, cool grass or a hard floor. All feel different under your feet.

There are ways of learning to see well by feeling. One way is to close your eyes and try to feel everything that is touching your skin. Feel the shoes on your feet, the clothes on your body, the air on your skin. At first, it is not easy to feel these things. You are too used to them!

Most museums are just for looking. But today some museums have some things to touch. Their signs say, “Do touch!” There you can feel everything on show.

If you want to see better, reach out and touch. Then you will really see!

1.By touching things __________.

A.you will have a strange feeling B.you will learn how to reach out your hand

C.you can learn more about them D.you can tell what colors they really are

2.Which of the following can be the best title of the story?

A.Touching by Feeling B.To See Better — Feel

C.To See or to Feel D.Ways of Feeling

3.Which of the following parts can tell you the difference between two coins in your pocket?

A.Your fingers. B.Your eyes. C.Your skin. D.Your back.

4.What can’t your skin feel?

A.Sounds. B.Coins. C.Water. D.Darkness.

5.Which of the following is NOT true?

A.Touching is helping us to see better.

B.Our skins may help us enjoy music.

C.Visitors can’t feel the things on show in any museums.

D.People don’t have to learn to feel.

八年级英语阅读单选中等难度题查看答案及解析

Is 　　　　 very important that people protect plants and animals?

A. they　　 B. he　　 C. there　　 D. it

八年级英语单选题中等难度题查看答案及解析

短文填词与阅读

Many people may think that the animals in the zoo are happy and lucky, but most of the animals are 　 1.　 .Animals.　 2.　 tigers, lions, and bears usually live in the forests or mountains .They can run, jump and play　 3.　 their children any time .They usually catch small animals for　 4.　 when they are hungry. But the animals in the zoo have to stay in small 　 5.　 They don’t have to find food by　 6.　 .The zookeepers　 7.　 them.They do nothing but eat,walk,and　 8.　 every day. Their　 9.　 in the zoo is quite　 10.　 from that in the forest because they are not free.

八年级英语选词填空中等难度题查看答案及解析

— What animal feeds on plants only?

— A 　　 does. But sadly, it’s more and more difficult for them to find enough food.

A　　　　　　 B　　　　　　 C　　　　　　 D

八年级英语单项填空中等难度题查看答案及解析

We have only one earth. It is the only environment for humans, animals and plants to live or grow in. However, we are polluting our earth every day. Good news is that the whole world has realized the serious problems and has taken action to fight against it.

World No Tobacco Day (May 31)

The first World No Tobacco Day is April 7, 1988. Since 1989, it was changed to be May 31st every year. The purpose of the World No Tobacco Day is to encourage people not to smoke.

World Water Day (March 22, 1993)

United Nations named 22 March as the first World Water Day in 1993. It’s a day to celebrate water. It’s a day to prepare for how we manage water in the future. It is celebrated around the world every year.

Earth Hour (2007)

Earth Hour started for the first time on March 31, 2007 in Sydney, Australia. Since then, the last Saturday of every March was named as Earth hour day that year. On March 19, 2016, more than 350 famous buildings in 178 countries around the world turned off the lights for one hour to remind people to save electrical power.

Actions in China to save our environment

Smoking is not allowed in all indoor public places from 2014. This is the first time for China to care about personal health in public places.

Ban(禁令) on free plastic bags. Since June 1, 2008, free plastic shopping bags are not allowed to provide in all supermarkets, shopping malls, and other places. It is to encourage people to use cloth bags or baskets for their shopping things.

八年级英语填空困难题查看答案及解析

It’s easy ______ English and it’s important ______it.

A．study, use                             B．say, speak

C．speak, say                             D．to learn, to practice

八年级英语单项填空中等难度题查看答案及解析

完形填空。

When you’re a teenager, it seems that every time you say, “I want to …”, your parents answer, “No, you can’t.”

Young people further complain that their parents do not ______ them. When something goes wrong , most parents just don’t believe in their ______.Without asking why, they think their kids are ______.And not many parents allow their kids to choose for themselves.

Yes, it is true that your parents sometimes treat you as a little child. ____remember that not long ago you were really a child. Your parents still remember the childish (幼稚的)____you used to make. They want to protect(保护) you ______you don’t want them to do so.

So, if you want to get ______ freedom(自由), please try to understand your parents and don’t lie to them. Try a more friendly way. If you want to_____late, don’t’ just say, “All the other kids can stay out late.” Tell them as much as you can about _____ you want to do and where you’ll be and why it’s important for you to stay out late. Then they just might say,“_____”.

1.A. love　　 　　 B. lose　　　　 C.understand　　　　 D .trust

2.A. friends　 　 B. children　　　 C. neighbours　　 D. leaders

3.A. polite　　 　 B. helpful　　　　 C. wrong　　　　　　 D. honest

4.A. But　　　 　 B. So　　　　　 C. And　　　　　　　 D. Or

5.A.uses　　　　 　 B. differences C. minds　　　　　　 D. mistakes

6.A.if　　　　　 　 B. though　　　 C. because　　　　 D. so

7.A.most　　 　　 B. least　　　　　 C. more　　　　　　 D. less

8.A.stay out　 　　 B. call back　　 C. get help　　　　 D. play cards

9.A.which　　 　　 B. why　　　　　 C. how　　　　　　　 D. what

10.A.sorry　 　　 B. yes　　　　　　 C. excuse me　　　　 D. pardon

八年级英语完形填空困难题查看答案及解析

Can animals do work for us? Some scientists think that animals may do a lot of jobs. They say that we may see many elephants, monkeys, dogs, bears and other animals do a lot of things. Animals can get something to eat if(如果) they do some work for people.

Some scientists say that many different animals may do lots of jobs if they know they will get something to eat. Of course, dogs can guard a house, and elephants can do some heavy jobs. And we can also teach animals to work in factories. In America apes(猿) can help people make cars. Scientists believe that these big monkeys may drive cars.

1.Many different animals may do many jobs if ___.

A. they can go to the wild. (野外)

B. they learn they can get something to eat

C they have a good place to live in

D. they are happy

2.___ can work for us.

A. Only a few animals     B. Lots of animals

C  Few animals         D. No animals

3.What kind of animals can guard(看护) a house?

A．A dog            B．An elephant        C．An ape           D．A monkey

4.What jobs can elephants do?

A．Doing heavy jobs.                       B．Guarding a house

C．Making cars                            D．Driving cars

5.Which of the following is true?

A．In China apes can help people make cars.

B．Scientists believe that monkeys may play the piano

C．All the animal can do work.

D．Apes may drive cars

八年级英语阅读理解中等难度题查看答案及解析

When we talk about stars, especially women stars，it seems that they are always young，pretty and own charming body shapes．But recently a Britain's Got Talent（英国达人）star Susan Boyle has changed our views absolutely(完全地)．

Simon Cowell，one of the judges of the talent show spoke of his shock over Ms Boyb's voice. “This lady came up，and I'm thinking, ‘This will take five seconds and I can go to have a cup of tea.’ That changed when she began to sing I Dreamed a Dream from Les Miserables. She knew we were going to have that reaction and just to see that look of satisfaction on her face midway through —it was one of my favorite moments,” Cowell said.

The performance was posted On line and before long，the 47-year-old Scottish woman has been famous all over the world．

Speaking from her home in Scotland,MsBoyle said that she hadn't thought of changing her appearance．She said that her friend helped her with make-up．“I mean，that's hardly a makeover.” she added．

Ms. Boyle also spoke of the reason she first began to explore her vocal(歌唱的) talents．”I was kind of slow at school, so getting something like singing was a good way of hiding behind that and thus it built my confidence．’’

1.．Susan Boyle is __________．

A．a judge   B．a reporter  C．a beautiful lady D．a Scottish woman

2.．Susan Boyle had a look of satisfaction on her face when she was singing because ______.

A．she was confident of her singing

B．she was satisfied with the judges

C．she was pretty and in good shape

D．she sang the song，I Dreamed a Dream from Lea Miserables

3.. What does the underlined word “views” mean?

A. 见解  B. 预告    C. 复习     D. 景色

4.．According to the passage，which is NOT true?

A．It was the vocal talents that built Susan's confidence．

B．Susan Boyle was not good at her lessons when at school．

C．Susan Boyle became famous because of her appearance．

D．Simon Cowell didn't think Susan Boyle a good singer at the time sight．

5.What can we learn from Susan Boyle's success?

A．It's never too old to learn．

B．It's easier to succeed at the age of 47．

C．If you have a dream，try to make it come true!

D．If you are not able to study well，to be a singer instead．

八年级英语阅读理解中等难度题查看答案及解析