题目
题型:不详难度:来源:
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.
小题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 |
A.变形的 | B.防水的 | C.太阳灼伤的 | D.表皮破损的 |
A.as flexible as | B.not so flexible as |
C.more important than | D.less important than |
A.To protect the plant. | B.To provide support. |
C.To move chemicals and wastes. | D.To control the water. |
答案
小题1:C
小题2:D
小题3:B
小题4:D
解析
试题解析:本文大意:也许很容易说植物与动物不同,任一孩子能讲出一棵树和一只狗的区别。但那些区别远比它们看上去的要深。 组成植物的细胞是不同的,换句话说,植物的细胞壁有特殊的东西。 首先不是所有的植物有细胞壁,另外,基于植物的种类细胞壁有很多不同。细胞壁在细胞膜的外面。通常坚硬不易破损,但柔韧性的程度不一样。细胞壁也多种方法工作来保护植物。更重要的是,控制水的出入。
小题1:细节理解题。根据 there are many differences of a cell wall based on the kinds of plant. 基于植物的种类细胞壁有很多不同,可知答案选C
小题2:推理判断题。根据It is usually hard通常坚硬 ,可知答案选D
小题3:细节理解题。根据Cells that make up the trunk of a tree are clearly less flexible than cells on a leaf.组成树***细胞很明显没有树叶的细胞柔韧,可知答案选B
小题4:细节理解题。根据 More importantly, they control the water that goes in and out.更重要的是,控制水的出入 ,可知答案选D
核心考点
试题【It may seem easy to say that plants and animals are different. Any child can tel】;主要考察你对科普环保类等知识点的理解。[详细]
举一反三
This is your future, and the robot’s name is NAO. NAO has a small body, big eyes and a large head. He can walk and dance. He listens and talks, and he even learns and thinks for himself. His creators (创造者) predict that the robot will be in people’s homes before 2040.
This $16,000 robot knows who you are. NAO can even express emotions (表达情感). He is a self-guided robot. A self-guided robot can sense (感觉), think and act. Other robots might do two out of the three. For example, a robot might sense things using cameras and think using computers, but with no arms, he can’t act. Another robot can move and sense things, but he can’t think for himself. These aren’t self-guided robots. But NAO can do them all.
小题1:The underlined word “greets” means “ ” in Chinese.
A.讨厌 | B.击败 | C.迎接 | D.仰慕 |
A.say happy birthday | B.dance | C.send a birthday gift | D.write |
A.He has a large body with a large head. |
B.He has big eyes and a large head. |
C.He has small eyes and a small head. |
D.He has a small body with a small head. |
A.In 2020. | B.In about 15 years. | C.In 2030. | D.In about 30 years. |
A.NAO isn’t a self-guided robot. |
B.NAO can’t help kids with their homework. |
C.NAO is more than fifteen thousand dollars. |
D.NAO can move and sense, but he can’t think. |
The sun is a star but it looks much bigger and brighter than any other star. Many stars are much bigger than the sun. The sun is much nearer to us, so it looks much bigger.
At night we can see the moon and many stars. The moon is a round ball. It is much smaller than the stars. The stars are much farther away from us; so thy look much smaller than the moon. The moon has no light of its own. When the sun shines on it, it looks bright. When the moon is full. It looks very beautiful.
小题1:Why does the sun look bigger than any other star?
A.Because it is bigger than any other star. |
B.Because it is hotter than any other star. |
C.Because it is brighter than any other star. |
D.Because it is nearer to us. |
A. The moon. B. The sun. C. The stars.
小题3:Why do the stars look smaller than the moon?
A.Because the stars are smaller than the moon. |
B.Because the stars are nearer to us. |
C.Because the stars are farther away from us. |
D.Because the stars are bigger than the moon. |
A.Because it is bright. |
B.Because it has light of its own. |
C.Because the stars shine on it. |
D.Because the sun shines on it. |
A.The sun looks like a bright plate. |
B.Many stars are bigger than the sun. |
C.The moon is smaller than the stars. |
D.The moon has light of it’s own. |
星期 时间 | Monday | Tuesday | Wednesday | Thursday | Friday |
9:00a.m. | Math | | Math | | English |
10:30a.m. | Chemistry | History | chemistry | | chemistry |
11:15a.m. | | | | | History |
1:45p.m. | physics | | physics | | physics |
3:00p.m. | | English | | math | |
A.Physics | B.Chemistry | C.History | D.Math |
A.Yes, they do | B.No, they don’t |
C.We can’t know from the table(表). | D.None of the above. |
A.9:10 a.m. | B.10:30 a.m. | C.1:45 p.m. | D.3:00 p.m. |
A.Only on Tuesday | B.Only on Friday |
C.On Tuesday and Friday | D.Every day |
A.3 | B.4 | C.5 | D.6 |
But little Smart is not really so smart. Users often complain about( 抱怨) its bad voice. “ I can’t make or get a phone call when I am on a bus,” a person in Hangzhou said. Scientists are trying their best to make Little Smart smarter. And the latest Little Smart even has a color screen.
小题1:Little Smart is popular because__________________.
A.the service of it is very cheap |
B.it’s very expensive |
C.it’s very smart |
D.it’s very useful in another city |
A.in some cities | B.in any city | C.only in the buses | D.only in your city |
A.has good sounds | B.has a colour screen( 屏幕) |
C.has a bad voice | D.is not smarter |
A.20 yaun | B.0.1 yuan | C.0.1 youan a minute | D.nothing |
Zhou got his mobile phone five months ago. He sent messages to his friends with it all the time, even when going to bed. Zhou started to do badly in the exams because he spent so much time playing with his mobile phone. His mother got very angry with him. He didn’t stop playing with the mobile phone until his arms got injured.
Yang Ling,a doctor, says that if someone uses his mobile phone too much, like Zhou Yan, he might get “mobile phone disease’. If teenagers find their arms or fingers hurt, they should go to see a doctor as soon as possible. Yang Ling said students should try to use their mobile phones less,especially at school.
小题1:Zhou Yan wishes he never got a mobile phone because____.
A.it is useless to him | B.it doesn’t work well |
C.it made his arms hurt | D.his mother got angry with him |
A.he didn’t like studying |
B.he was ill and didn’t go to school |
C.he was afraid of exams |
D.he spent much time on the mobile phone |
A.the mobile phone brought him a disease |
B.something is wrong with his mobile phone |
C.he can’t live without the mobile phone |
D.he hates the mobile phone very much |
A.go to see a doctor very often |
B.use mobile phones more when they are out of school. |
C.use mobile phones less. |
D.not use mobile phones anymore |
A.using mobile phones too much is bad for our study and health |
B.only a few teenagers have mobile phones |
C.mobile phones can help students get out of trouble |
D.people shouldn’t use mobile phones |
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