初中科技英语阅读理解
1. 英语阅读理解文章
This is not the world we know. This world is controlled by computers. Men and women can be seen, but they are following orders given to them by machines. The machines were designed by mad scientists, but at some point even the mad scientists were taken over by their super-inventions.
Does this sound familiar? You have probably read something like it in magazines or books, or seen it in a film. Why is it popular? One of the reasons is that it reflects the fears of many people; fear of the unknown, fear of what is not understood or, at least, fear of something that is not completely understood.
The fact is that every day it seems that computers take control of another area of our lives. Some factory jobs are now done by robots(机器人)and the robots are controlled by computers. Our bank accounts are managed by computers. At the airport, our tickets are sold by a computer. Certainly many of these operations are made more efficient by computers, but our admiration is sometimes mixed with unsafe feelings. And this lack of safety is caused by the fact that we do not know how computers do these things, and we really don’t know what they might do next.
But we can find out how computers work, and once we understand them, we can use computers instead of worrying about being used by them. Today, there is a new generation of computer wizards(奇才) who know exactly how computers get things done. These young men and women, usually university students, are happy to sit for hours, sometimes for days, designing programs, not eating, not sleeping,. But discovering what can be done by these wonderful slaves which they have learned to control. These computer wizards have learned to use the computer and search for new tasks for their machine.
2. 要5篇分类英语阅读：动植物，人物，科技发明，中西方文化介绍（节日），地理知识。要5道练习题及答案
动植物:
Plants are very important living things. Life could not go on if there were no plants. This is because plants can make food from air， water and sunlight. Animals and man cannot make food from air， water and sunlight. Animals get their food by eating plants and other animals. Therefore animals and man need plants in order to live. This is why we find that there are so many plants around us. If you look carefully at the plants around you， you will find that there are two kinds of plants： flowering plants and non-flowering plants. Flowering plants can make seeds. The seeds are protected by the fruits. Some fruits have one seed， some have two， three or four， and some have many seeds. But a few fruits have no seeds at all. An example of a fruit without seeds is the banana fruit. Most non-flowering plants do not grow from seeds. They grow from spores(胚芽)。 Spores are very small. Some spores are so small and light that they can float in the air. We may say that spores are quite the same as seeds. When these spores are all on wet and shady places， they usually grow into new plants.
. The main idea of the first paragraph is that ______.
A. plants are important for life
B. plants cannot grow without air
C. there are many plants in the world
D. we can not live without water
2. Plants can make food from______.
A. flower， water and air
B. water， sunlight and air
C. air， water and soil
D. air， sun and light
3. What can we infer(推断) from the passage ?
A. Of all living things animals are most important
B. Spores are seeds
C. All fruits of flowering plants have seeds
D. Without plants， man will die out
4. This passage may be taken from______.
A. a medicine book
B. a novel
C. a science magazine
D. an experiment report
5. The underlined word “protected” in the third paragraph can be replaced by ______.
A. damaged B. polluted C. prevented D. guarded
1-5 ABDCD
3. 求科初中技类英语阅读题!!!!!!!!
At the beginning of last century, medical scientists made an interesting discovery that we are built of not just of flesh and blood but also of time. They were able to show that we all have a “body clock” __31__ us, which controls the __32__ and fall of our body energies, making us different from one day from the next.
The __33__ of the “body clock” should not be too surprising since the lives of most living things are controlled by the 24-hour night-and-day cycle(周期). We feel __34__and fall asleep at night and become __35__ and energetic ring the day. If the 24-hour cycle is disturbed, most people will experience unpleasant feeling. For example, people who are not__36__ to working at night can find that lack of sleep causes them to perform badly at work..
Besides the __37__ cycle of sleeping and waking, we also have other cycles which __38__ longer than one day. Most of us would __39__ that we feel good on some days and not so good on __40__; sometimes our ideas seem to flow and at other times, they just do not exist.
31. A. inside B. around C. between D. on
32. A. movement B. supply C. use D. rise
33.A. invention B. problem C. story D. idea
34.A. hungry B. tired C. dreamy D. happy
35.A. sad B. excited C. lively D. sleepy
36. A. made B. allowed C. expected D. used
37.A. daily B. weekly C. monthly D. yearly
38.A. live B. last C. stay D. keep
39. A. agree B. believe C. realize D. understand
40.A. other B. the other C. others D. another
Japan has a new craze: the virtual pet” Tamagocchi. The new object of consumer desire is the latest in high-tech — an electronic bird creature, the size of an egg that has been sold everywhere and is now only available on the streets at more than 20 times its original (原来的)price of 11,980 yen or $16.
You can feed it, stroke (抚摸) it, carry it in your pocket and even take it to the bathroom—all with a push of a button. But be aware of that if you don’t take care of your Tamagocchi—Japanese word for “lovely egg”— your pet will die before your eyes and before its time.
The Tamagocchi starts life as a bird-like image on the screen of an egg-shaped key-ring device. It changes from a chick to a fully grown alt in around 10 days. However, the owner must feed, clean and calm the digital(数字的) creature by pushing the proper buttons to prevent it from dying from neglect(忽视). The owner may choose to feed the creature digital sweets and enjoy its sound of delight by pressing buttons in response to the creature’s movements.
41. What’s the meaning of “ the latest in high-tech” according to the passage?
A. A bird creature fed by a child.
B. A bird creature controlled by electricity.
C. A bird creature controlled by electron.
D. A bird creature fed with sweets.
42. What is the present price of Tamagocchi?
A. About 180 dollars B. 60 dollars C. About 320 dollars D. 1,200 dollars
43. Which of the following statements is NOT true about Tamagochi?
A. It can grow up in around 10 days.
B. It has to be fed, cleaned and calmed in case it might die.
C. It can proce a sound of delight.
D. It can be bought everywhere now.
44. What is the best title for the passage?
A. A New Type of Pet.
B. Take Good Care of the Tamagocchi.
C. The Popularity of the Tamagocchi in Japan.
D. A Newly Found Bird—the Tamagocchi.
Some scientists say that animals in the ocean are increasingly threatened(威胁)by noise pollution caused by human beings..
The noise that affects（影响） sea creatures comes from a number of human activities. It is caused mainly by instrial underwater explosions（爆炸）, ocean drilling, and ship engines. Such noises are added to natural sounds include the breaking of ice fields, underwater earthquakes, and sounds made by animals themselves.
Decibels (分贝 measured in water are different those measure on land. A noise of one hundred and twenty decibels on land causes pain to human ears. In water, a decibels level of one hundred and ninety-five would have the same effect.
Some scientists have proposed（提议）setting a noise limit of one hundred and twenty decibels in oceans. They have observed that noises at that level can frighten and confuse whales（鲸鱼）.
A team of American and Canadian scientists discovered that louder noises can seriously injure some animals. The research team found that powerful underwater explosion were causing whales in the area to lose their hearing. This seriously affected the whales’ ability to exchange information and find their way. Some of the whales even died. The explosion had caused their ears to bleed（流血）and become infected（感染）.
Many researchers whose work depends on ocean sounds object to(反对) to a limit of one hundred and twenty decibels. They say such a limit would mean an end to important instrial and scientific research.
Scientists do not know how much and what kind of noises are harmful to ocean animals. However, many scientists suspect(认为，怀疑) that noise is a greater danger than they believed. They want to prevent noises from harming creatures in the ocean.
52.According to the passage , which of the following is increasingly dangerous to sea creatures?
A. The man-made noises.
B. The noises made by themselves.
C. The sound of earthquakes.
D. The sound of the ice- breaking.
53. Which of the following is discussed in the third paragraph?
A. Different places with different types of noises.
B. The very human ears sensitive to all types of noises.
C. The same noise measured differently on land and in the ocean.
D. The animal’s reaction(反应) to noises.
54. As to the influence (影响)of noises on whales, which of the following statements is true?
A. They are deaf to noises.
B. Noises at a certain level may hurt them.
C. They are easily confused by noises.
D. Noises will limit their ability to reproce.
55. According to the passage, what will scientists most probably do in the future?
A. They will try their best to decrease(减小)noise.
B. They will work hard to cut down noise pollution.
C. They will study the effect of different noises.
D. They will protect animals from harmful noises.
第一个答案 ADDBC DABAC
第二个答案 CCDA
第三个答案 CACBD
绝对正确．
4. 科技英语阅读理解2
98. D
99. D
100).A
5. 初中英语阅读理解题型
初中英语阅读理解题型
英语阅读理解题是中考英语常见的题型之一,且占比分较大,让学生熟悉常见的题型,掌握正确的答题技巧及解题步骤,可收到"事半功倍"的效果。下面就由我来跟大家介绍一下初中英语阅读理解常见题型及答题技巧吧!
【初中英语阅读理解题型及解题技巧】
(一)主旨题
主旨题主要考查学生对短文中心思想或作者意图的掌握。做此类题时，应通读全文，理解文章大意，充分理解主题句的意义。短文往往围绕主题句展开，主题句通常出现在短文第一句或最后一句。
(二)细节题
细节题是用来进一步表达主题，体现中心思想的，往往针对短文某个细节来设题。做此类题时，应快速捕捉信息，可能是一些事例、数字等，阅读时要有针对性。
(三)推断题
推断题就是根据某个事实推断结论，主要考查学生的理解力和推断力。这类推断通常包括：数据事实推断、常识推断以及作者的写作目的、态度和倾向等的推断。做此类题时，应根据短文中的相关语句，对与事实有关的细节加以分析，找出线索，悟出字里行间的意思，反复比较，从而作出合乎逻辑的判断。
(四)猜测词义题
猜测词义题主要考查学生根据上下文正确判断灵活变化的词义能力。一般情况下，推断词义的题目中所出现的单词，大多数是学生未曾见过的生词，学生需要在该词出现的上下文中去寻找线索。通过阅读上下文，断定该词的真正含义，然后将这个释义代入文中，检查是否贴切，仔细比较直到得出该词的确切的含义。
(五)正误判断题
正误判断题主要考查学生对文章的具体事实、信息的理解能力。一般是根据文章的事实或细节，给出一个句子，判断其正误。这类题比较直接，难度相对较小。做此类题时，应先看题，后带着“问题”快速阅读短文，寻找所需要的信息。 初中英语阅读理解题已成为评估学生英语水平的重要测试题型，在中考英语试卷中所占比重较大。阅读理解题主要是考查学生综合运用所学语言知识的能力，包括细节理解能力、词义判断能力、归纳概括能力及逻辑推理能力等。大致来说，阅读理解题主要针对如下方面：
(1) 个别词语或句子;(2)某一细节或情节;(3)主题;(4)背景知识;(5)结论或结局;(6) 内涵隐意或寓意等。下面本人就根据阅读理解题的题型特点，来谈一些答题技巧。
一、直接理解题
这种题目比较简单，只要通读全文，了解文中所叙述的重要事实或细节就可以解答出来，有的甚至可以从文章的原句中直接找到答案。此类题目的出题形式很多，例如：
(1)Which of the following statements is true / false?
(2)Which of the following is(not)mentioned?
(3)How many / How much / Where / How / What„„?
(4)What does the writer think about?
(5)Which is the right order of the events given in thepassage?
要快速辨认和记忆事实或细节，就需要恰当地使用查阅的方法。查阅是读者在对材料有所了解的情况下进行的，它的特点是带着问题去寻找答案，往往与略读综合使用，具体方法与步骤如下：
(1)略读材料，了解原文大意，掌握其中心意思或主旨。
(2)按文章的体裁、作者写作的组织模式及有关信息词，如for example，first，second„„预测应该到何处寻找自己所需要的事实。
(3)将自己的精力放在寻找所需要的细节上，快速通篇阅读，眼睛自左至右、自下而上呈Z形扫视，待找到含有相关细节的句子时，就要放慢速度，仔细核对，比较内容，直至找到答案。
二、语义理解题
在阅读中，我们经常会遇到一些生词，需要根据上下文猜测它们的意思。此类问题考查学生紧扣原文，根据上下文语境判断单词、词语或短句意义的能力。常见的题型有：直接对生词进行解释;对多义词或短语在文章具体语言环境中的意义作出准确判断;对英语中的一些格言或谚语进行解释;对文中一些代词的指代对象作出界定等。这种题型常见的设题方式如下：
(1)The underlined word(phrase)in the passage means______.
(2)The word“it/them”in the first paragraph refers to______.
(3)The underlined sentence in the last paragraph means____.
(4)What does the underlined word“„”refer to______.
(5)By „ the writer means______.
在做此类题时，考生应紧扣原文，根据上下文语境进行判断，切不要望文生义或断章取义，也不能只选择自己熟悉的意思。猜测词义的常见方法有：
1)根据构词法猜测词义;
(2)根据上下文猜测词义;
(3)根据定义或解释猜测词义;
(4)根据同义词、反义词以及对比关系猜测词义;
(5)根据生活常识猜测词义。
三、逻辑推理题
推理判断试题属于深层阅读理解题。它要求考生尽量考虑文中全部信息或事实，在通篇理解文章的基础上，严格按照作者提供的信息推断出作者的言外之意。这种题型常见的设题方式有：
(1)From the text，it can be inferred that______.
(2)The passage suggests that______.
(3)Which of the following best describes______.
(4)The writer’s attitude towards„is______.
(5)From the text，we learn that______.
这种题目有一定难度，解答时必须根据上下文及相互间的关系或对整篇文章进行深层理解后，才能找到答案。有时甚至还得联系作者的意图、态度等文外之意加以推理。解此类题目可从以下几方面入手：
(1)根据常识判断。即解题时，除弄清文意外，还需借助生活常识、风土人情、传说掌故、名人轶事等进行判断。
(2)根据知识判断。即解题时，运用一些一般性知识，如天文、地理、文学、艺术、科技等自然科学和社会科学知识。
(3)根据计算判断。即解题时，运用一些数学知识进行和差、面积、体积、速度等方面的运算。
(4)根据情节判断。即解题时，从情节所提供的基本事实出发，寻找一定规律，如时间关系、条件关系、因果关系、比较关系、转折关系等作为推理根据。这种题目最容易出现，考生要从时间、地点、事件的情节安排与发展中，深入探讨其逻辑关系及隐喻、引申等因素。
四、归纳总结题
这种题型要求学生在理解全文的基础上，对文章进行归纳、概括或评价。解这种题目时，不能只凭文中的只言片语而断章取义，如涉及文章的标题(title)、主题(main idea)、结论(conclusion)、结局(end)等有关问题，都需要在细读全文的基础上，结合所学语言知识进行逻辑思维、推理、判断，从而获取文章中的内在信息。常见的设题方式有：
(1)The general idea of the passage is about______.
2)The main idea of the article is______.
(3)The main purpose of this selection is______.
4)The passage suggests that______.
5)Which of the following best states the theme of thepassage?
具体解题时，应注意一些技巧：
(1)首先看短文的开头和结尾，确定短文题材，预测其内容。每段的第一句话往往会提供重要信息，可以帮助我们搜索各段落乃至整篇文章的大意。
(2)速读全文，整体理解短文大意，抓住关键词语，弄清文章的主旨。
(3)根据已知短文内容，着手解题。可先将文后的选择题看一下，然后带着问题再去阅读。这样做，一方面有助于对文章进一步理解，另一方面可以有针对性地从文章中寻找答案。
(4)迅速复读全文，检查自己的理解是否正确，所选答案是否前后矛盾。通过全面考虑，最后确定答案。
一.教学大纲对阅读理解的要求
(一)初中英语教学大纲对学生阅读上的基本要求：
1.能阅读难度相当于课文的材料，理解其大意。
2.能独立阅读所学语言知识范围内的材料，生词率不超过3%。
3.阅读速度要求每分钟50-70词。
(二)中考阅读理解的考点
1.文章的话题—略读文章，领会文章大意的题。
2.文章的中心题—归纳，概括的能力。
3.文章的细节—扫读或细读文章，以获得某些特地信息或准确的寻找所需细节的能力。
4.文章的寓意，结论-领会作者的言外之意或推断出文章的结论。
5.生词词意，猜词—对生词词意的判断能力。
(三)中考阅读理解考察的文体
1.记叙文—抓住人物，地点，时间，情节发展线索。
2.说明文—要以事物为中心进行思考。抓住事物的特征，用途，相互关系等。
(四)解题思路与技巧
1.快速浏览全文，掌握大意。
2.仔细审题，分析比较选项 。
3.带着问题复读，捕捉关键信息，解答问题。
4.再读全文，核对答案。
二.阅读理解题型及解题技巧
从近几年的中考阅读理解情况看，短文体裁多样，题材各异，文章涉及科学知识、社会文化、政治历史、人文环境和日常生活等方面，
充分体现其时代性、实用性。短文难度逐年加大。常见题型有主旨题、细节题、推断题、猜测词义题和正误判断题。
做阅读理解练习应先看问题，弄清考点。在阅读短文之前，快速浏览问题，以便在阅读短文时做到心中有数，快速、准确地捕捉所要信息。先易后难。做题时不必拘泥于书中所呈现的语篇顺序，应遵循先易后难的原则。如可先做细节题再做推断题，因为细节题大多能直接从文中找到答案，而推断题则需对短文进行深层理解，再作判断。
(一)主旨题
主旨题主要考查学生对短文中心思想或作者意图的掌握。做此类题时，应通读全文，理解文章大意，充分理解主题句的意义。短文往往围绕主题句展开，主题句通常出现在短文第一句或最后一句。
(二)细节题
细节题是用来进一步表达主题，体现中心思想的，往往针对短文某个细节来设题。做此类题时，应快速捕捉信息，可能是一些事例、数字等，阅读时要有针对性。
(三)推断题
推断题就是根据某个事实推断结论，主要考查学生的理解力和推断力。这类推断通常包括：数据事实推断、常识推断以及作者的写作目的、态度和倾向等的推断。做此类题时，应根据短文中的.相关语句，对与事实有关的细节加以分析，找出线索，悟出字里行间的意思，反复比较，从而作出合乎逻辑的判断。
(四)猜测词义题
猜测词义题主要考查学生根据上下文正确判断灵活变化的词义能力。一般情况下，推断词义的题目中所出现的单词，大多数是学生未曾见过的生词，学生需要在该词出现的上下文中去寻找线索。通过阅读上下文，断定该词的真正含义，然后将这个释义代入文中，检查是否贴切，仔细比较直到得出该词的确切的含义。
1.通过因果关系猜词
通过因果关系猜词，首先是找出生词与上下文之间的逻辑关系，然后才能猜词。有时文章借助关联词(如because，as，since，for，so，thus，as a result，of course，therefore等等)表示前因后果。例如：
You shouldn't have blamed him for that，for it wasn't his fault.通过for引出的句子所表示的原因(那不是他的错)，可猜出blame的词义是"责备"。
2.通过同义词和反义词的关系猜词
通过同义词猜词，一是要看由and或or连接的同义词词组，如happy and gay，即使我们不认识gay这个词，也可以知道它是愉快的意思;二是看在进一步解释的过程中使用的同义词，如Man has known something about the planets Venus，Mars，and Jupiter with the help of spaceships.此句中的Venus(金星)、Mars(火星)、Jupiter(木星)均为生词，但只要知道planets就可猜出这几个词都属于"行星"这一义域。通过反义词猜词，一是看表转折关系的连词或副词，如but，while，however等;二是看与not搭配的或表示否定意义的词语，如：He is so homely，not at all as handsome as his brother.根据not at all...handsome我们不难推测出homely的意思，即不英俊、不漂亮的意思。
3.通过构词法猜词
在阅读文章时，我们总会遇上一些新词汇，有时很难根据上下文来推断其词意，而它们对文章的理解又有着举足轻重的作用，此时，如掌握了一些常用的词根、前缀、后缀等语法知识，这些问题便不难解决了。
4.通过定义或释义关系来推测词义
例如：But sometimes，no rain falls for a long，long time. Then there is a dry period，or drought.
从drought所在句子的上文我们得知很久不下雨，于是便有一段干旱的时期，即drought，由此可见drought意思为"久旱"，"旱灾"。而a dry period和drought是同义语。这种同义或释义关系常由is，or，that is，in other words，be called或破折号等来表示。
5.通过句法功能来推测词义
例如：Bananas，oranges，pineapples，coconuts and some other kind of fruit grow in warm areas.假如pineapples和coconuts是生词，我们可以从这两个词在句中所处的位置来判断它们大致的意思。从句中不难看出pineapples，coconuts和bananas，oranges是同类关系，同属fruit类，因此它们是两样水果，准确地说，是菠萝和椰子。
6.通过描述猜词
描述即作者为帮助读者更深更感性地了解某人或某物而对该人或该物作出的外在相貌或内在特征的描写。例如：The penguin is a kind of sea bird living in the South Pole. It is fat and walks in a funny way. Although it cannot fly，it can swim in the icy water to catch the fish.从例句的描述中可以得知penguin是一种生活在南极的鸟类。后面更详尽地描述了该鸟类的生活习性。
(五)正误判断题
正误判断题主要考查学生对文章的具体事实、信息的理解能力。一般是根据文章的事实或细节，给出一个句子，判断其正误。这类题比较直接，难度相对较小。做此类题时，应先看题，后带着“问题”快速阅读短文，寻找所需要的信息。
;6. 科技英语阅读7内容太长了 到8里接着看吧
【1节】有两个主要的事情，使飞机工程困难;必须尽一切组成部分可靠的，可能和需要建立的一切轻如可能。事实上，飞机是在空中，不能停止，如果任何事情都会发生错误，这使得或许是生死存亡，其性能绝对可靠。鉴于某些权力的发动机，因此，一定燃料消耗，有一个实际的限制，总重量的飞机可以飞。在体重尽可能通缉燃料，无线电导航仪器，乘客座位，或货物的房间，当然，乘客或货物本身。因此，结构的飞机将作为体积小，重量轻的安全性和效率将允许。设计者必须计算出的正常负荷，每个部分将难以承受。这个专家称为''强调人' 。他考虑到任何不寻常的强调，可能是把一部分作为一个防范错误的制造，意外损坏等。男子应力的计算去设计的一部分，他必须一样强烈的应力男子说，如果必要的。一个或两个样品的测试总是证明他们是强烈的设计意图。每个单独的部分进行测试，然后整个装配，例如，一个完整的机翼，并最终整个飞机。当一种新型的飞机正在取得，通常只有一个头三个提出将飞行。两名将被摧毁在地面上的结构试验。第三是将测试空气中。【2节】两种地面强度试验进行。首先是寻找抗负荷的翅膀，尾巴等直至他们达到其最大负荷和崩溃。其他测试是疲劳强度。相对较小的载荷应用数千次。每个可以及在什么样的结构可以作为一个单一的负荷，但许多重复可能导致崩溃。一位从这个试验是这样做的客舱。这是充满空气在高压力，高超低空飞行，完全淹没在一个大罐的水，而测试正在进行中。周围的水无法从机舱爆裂像一个炸弹，如果有一个失败。当飞机已通过所有的测试可以得到政府的单机适航证，没有这一点，是非法的飞行，除了飞行试验。制作可靠的工作部件是困难的，因为决策的结构足够强大。飞行控制，电气设备，防火措施等。不仅必须重量轻，而且必须在高海拔地方的温度可能低于冰点和热空气的一个机场在热带地区。【翻译的还不错吧！】
7. 科技英语阅读 李健版 翻译U3 植物的适应性 课文翻译
根据生物某些特征的存在来确定其它因素的现象，叫生物的指示现象，或指示作用。它们具有指示意义的某些特征，称为指示特征(包括形态的、生理的、生物化学的等)。有气候指示特征的(如热带植物、寒带植物)；有水指示现象的(人们在干旱地区常借助植物来找水源)；有土壤指示现象的(铁芒箕是强酸性土壤的指示植物，碱蓬指示碱性土壤)；有地质指示现象的(湖北省黄石市就有一种草能指示地下有铜和铁矿)；还有些植物对环境污染有指示作用，如矮牵牛花。 生物的指示作用表明，各个自然地理要素之间处于紧密相互联系、相互依赖的关系之中。掌握了它们之间有规律的联系，就有可能利用一个要素的特征去认识另一个要素的存在。 从理论上讲，地球上最初产生地壳，之后形成大气圈、水圈，最后出现植被、土壤和动物界。因而，愈是年老的(即先产生的)要素对其它年青的(即后产生的)要素影响愈大；愈是年青的的要素对其它年老的要素依赖性愈大。正是这些独立性最小而依赖性最大的要素具有最大指示意义。所以，后出现的植物对其它要素的影响具有很大的表现能力。 地球上的生命界可以划分成不同的层次或组织水平。从大分子有机物开始直到生物圈，复杂程度逐级增加。当从一个层次过渡到另一个较高层次时，生命组织便会出现前一级所不具有的新性质和特征。 生物存在于地理环境之中的，它们在个体发育的全部过程中，经常不断地与环境间进行着物质与能量的交换。它从环境中取得必需的能源和营养物质，建造自己的躯体，同时又把不需要的代谢产物排放到外界环境中，以此维持其正常的生命活动和种族的繁续。因此，任何生物有机体都不能脱离环境而生存。环境控制和塑造着生物的生理过程、形态构造和地理分布。 在环境对生物发生影响的同时，生物有机体，特别是它们的群体也对环境产生相当明显的改造作用。针叶林下土壤的酸度往往比同一地区阔叶林下的要高些。湖泊中浮游生物大量繁殖时，导致水体透明度下降，从而改变水中的光照条件。从更长远的时间尺度看，生物还参与岩石的风化，地形的改变和土壤的形成，以及某些岩石和矿床的建造。水土流失可以用植物来防治，流动的沙丘可以用乔木、灌木和草本植物来固定。 在环境中对生物的生命活动起直接作用的那些环境要素叫做生态因素，如日光、热、水、风、矿物盐类和其他生物等。地形、海拔高度等则属于间接起作用的因素，它们通过改变气候、土壤等条件而对生物产生影响。 各个生态因素并不是孤立地、单独地对生物发生作用，而是共同综合在一起对生物产生影响，一个生态因素不管它对生物的生存有多么重要，也只能在有其他因素的适当配合下才能发挥其作用。 生物或其群体具体居住地段的所有生态因素的总体叫做生境。由于地表各地气候、土壤、岩性和地形等条件不同，形成极其多种多样的生境类型，这正是地球上生物种类和其群体类型复杂多变的主要原因之一。 地球上各种生态因素的变动幅度非常广阔，每种生物所能适应的范围却有一定的限度。如果当一个或几个生态因素的量或质低于或高于生物所能忍受的临界限时，不管其他因素是否适合，生物的生长发育和繁殖都会受到影响，甚至引起死亡。这样的生态因素称作限制因素，它是最易阻挠和限制生物生存的因素。限制因素随时间地点而变，也因生物种类而异。在干旱和半干旱地区，水分条件往往是植物生存的限制因素。在严重污染的水域中，有毒的污染物常常是水生生物生存的限制因素。在研究环境对生物的生态作用时，既要注意生态因素的综合作用，又要找出在一定条件下影响生物生存的限制因素，为采取相应管理措施提供科学依据。 生物在其生存过程中，对生态因素的忍耐不仅有一个生态上限和下限，同时在它的耐性限度内还有一个比较小的生态上的最适范围，在这里生物生长发育得最好。在自然界，生物种并非经常处于其最适生境条件下，因为生物间的相互作用和外界自然条件的变化，妨碍生物去利用最适宜的环境。不同的生物种对生态因素和环境的适应能力有差异。一般来说，对环境适应能力较强种类，其分布范围较广。
8. 八年级英语阅读理解及答案
八年级英语阅读理解及答案
英语的'阅读内容涉及的范围较广，有关于历史的也有关现实生活的，有故事性的文章，也有经济、科技、军事等方面的文章。下面是我分享的八年级(初二)的英语阅读理解题，希望能帮到大家!
初二英语阅读理解【1】
The best way of learning a language is using it. The best way of learning English is talking in English as much as possible. Sometimes you’ll get your words mixed up(混合) and people won’t understand you. Sometimes people will say things too quickly and you couldn’t understand them. But if you sense of humor (幽默感), you can always have a good laugh at the mistakes. It’s better for people to laugh at your mistakes than to be angry with you, because they don’t understand what you are saying. The most important thing for learning English is :” Don’t be afraid of making mistakes because everyone makes mistakes.”
( )1. The writer thinks that the best way for you to learn a language is _____
A. writing it B. using it C. listening D. learning grammar
( )2. What should you do in learning English?
A. Be careful not to make any mistakes B. Write as quickly as you can
C. Speak English as much as you can D. Laugh more often
( )3. When people laugh at your mistakes, you should _____
A. not care B. be happy C. feel worried D. be unhappy
( )4. When you make s mistake, you should ______
A. keep quiet B. get angry C. be kind D. keep your sense of humor
( )5. The story tells us :“______”.
Only foolish(愚蠢) people make mistakes
Few people make mistakes C.People never make mistakes
D.There is no one who doesn’t make mistakes
答案： B.C.A.D.D
初二英语阅读理解【2】
Look at the light and beautiful snowflakes(雪花)falling.Ever wanted to hold them in your hands?They are always lost when they meet your hands.
Well,this isn’t just a problem for you.It was a problem for Wilson Bentley,too.In the 1870s,Wilson Bentley was just a teenager.His family lived in a small town in northeast America.Winters there were long and hard.Bentley’s mother was once a school teacher. She taught him at home. Bentley didn’t go to school until he was
14. He was a quiet boy, and loved reading his mother’s books.But it was his mother’s microscope (显微镜) that interested him. When the other boys were playing with balls, little Bentley was studying things like drops of water, flowers and snowflakes. Bentley loved watching snowflakes. For the next two years young Bentley spent many winter days in a cold room watching these ice crystals (晶体) under his microscope.The boy thought they were so beautiful that he started to draw pictures of them. But there were so many snowflakes that he couldn’t draw them all. How could he keep their beauty forever? Bentley thought of buying a camera.
The boy and his mother asked his father to buy one. But, his father didn’t agree. He thought the whole thing was a bad idea. He thought the only thing a farmer should do was farming.
But finally Bentley did get a camera. For more than a year he tried to take pictures of snowflakes. On January 15, 1885, ring a snowstorm, Bentley took the first ever photo of an ice crystal with his camera. “It was the greatest moment of my life,” Bentley said later.
For 13 years, Bentley worked quietly and took thousands of photos of ice crystals. Later he became known as “Snowflake” Bentley.
根据短文，选择最佳答案：
( )1. The best title for this passage is ____.
A. Snowflake Photos B. Snowflake Boy
C. Long and Hard Winters D. Teenage Photographer
( )2. We can tell from the story that Bentley’s father was ____.
A. a farmer B. a funny man C. an athletic man D. a school teacher
( )3. Which of the following statements about Bentley is true?
A. He didn’t get any kind of ecation as a child.
B. He was born into a rich family.
C. He was the first person to take photos of snowflakes.
D. He was fascinated by the beauty of snowflakes.
( )4. What kind of person do you think Bentley was?
A. He was outgoing. B. He was too serious.
C. He was interested in learning. D. He was very warm-hearted.
( )5. The “ice crystals” in the third paragraph refers to “____”.
A. water drops B. rain drops C. flowers D. snowflakes
答案 ：B A C C D
初二英语阅读理解【3】
The sun is always shining. But it can only shine on one side of the earth at one time. When the sun is shining on one side of the earth, it is night on the other side.
At night, you can see the stars(星星). The stars are in the sky all day. But the light from the sun is so bright that you can’t see them. When night come, there is no light, and the stars are bright enough to see. The stars look very small. But some of them are even bigger than the sun. They look small because they are so far away from you. Big things look much smaller when they are far away. The sun is closer(近)to the earth than other stars, so it looks bigger.
( )1.When it is night, the sun ________ .
A. doesn’t shine B. shines for a short time
C. disappears(消失) D. shines on the other side of the earth
( )2.We can’t see the stars in the sky at daytime(白天)because ________ .
A. there are no stars there
B. the stars are much smaller than the sun
C. the bright light from the sun makes them not seen(被看见)
D. the stars come out only at night
( )3.The stars look small because ________ .
A. they are far away B. they are small
C. they have no light D. they are in the sky
( )4.Small things may look ________ when they are close.
A. bigger B. small C. near D. far away
( )5.The sun looks bigger than other stars because ________ .
A. it’s bigger B. it’s far away in the sky
C. it gives much bright light D. it’s closer to the earth than other stars
答案： D.C.A.A.D
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