29． Why are green plants and grass helpful?A． Because they can hold the water．B． Because they can stop the wind from blowing the earth away．C． Because they can keep the earth wet．D．All the above．
题目
29． Why are green plants and grass helpful?
A． Because they can hold the water．
B． Because they can stop the wind from blowing the earth away．
C． Because they can keep the earth wet．
D．All the above．
相似考题
更多“29. Why are green plants and grass helpful?A. Because they can hold the water.B. Becaus ”相关问题
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第1题：
Why does the writer of the letter that Electro-Robo is violent?
A. It is control to radio water.
B. It is expensive to buy.
C. It is 80 centimeter
D. It bears arms.
正确答案：D
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第2题：
Why do the depository institutions have the fractional reserve banking?
A．Because they can keep a large amount of deposits from their depositors in the form. of reserves.
B．Because most of their depositors would withdraw their deposits.
C．Because only a small fraction of their depositors would deposit money during a day or week.
D．Because they can meet the need of withdrawing of their depositors and make investments in other financial assets.
正确答案：D
解析：文章第一段提到Depository institutions...week to withdraw their deposits。存款准备金是指金融机构为保证客户提取存款和资金清算需要而准备的在中央银行的存款。存款机构能这样做是因为存款者在不定的时间内会提取存款。只有D选项的意思是与题意相符。 -
第3题：
Why do we use the weather satellites to take pictures of the atmosphere?Because______．
A．the weather satellites can do it easily
B．clouds form. there
C．the weather forms there
D．the pictures can forecast the weather
正确答案：C
细节题，根据第一段“because this is where the weather form”知道答案选C。
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第4题：
A
Why do plants grow in some places and not in others? Why does some land have so much growing on it，while other land has almost no plants growing on it at all?
To grow plants need several things． One is warmth． In very cold places almost nothing grows． Plants also need water． In very dry parts of the earth only a few unusual plants can grow． That's why dry deserts everywhere are almost not covered by trees or grass．
Plants must also have a place in which to f，ut down their roots and grow． They find it diffi-culr to grow on hard land． The town is built on hard land． The plants here have only the soil found between the cracks of the stones Io grow in．
Another thing plants must have before they can grow is food．
Whar will happen if we try to make things grow on the sandy beach? A few plants，such as beach grass，will grow in sand，L ut most plants won-t． Even if the weather is warm enough．and we water the plants each day． Many of them will die because the sand on this beach has al-most no food for plants．
( )21． According to the passage，plants need _________ things to grow well．
A． two
B． three
C． four
D． five
正确答案：C
Ⅲ．21．C【解析】通读全文可知：植物的生长需要4个条件：1．适宜的温度；2．水;3．合适的土壤；4.养分。 -
第5题：
B
Scientists are trying to make the deserts into good land again． They want to，bring water to the deserts． But more and more places of the earth is becoming deserts all the time， Scientists may not be able to change the deserts． Scientists think that people make deserts． People are do-ing bad things to the earth．
Some places on the earth don-t get very much rain． But they still don-t become deserts．This is because some green plants are growing there． Small green plants and grass are very helpful to dry places． Plants don't let the wind blow the earth away． When 8 little bit of rain falls，the plants hold the water． Without plants，the land can become a desert much more easily．
( )26． Why can the land become a desert?
A． Because some places don't get very much rain．
B． Because plants don-t let the hot sun make the earth even drier．
C． Because people don't keep the earth well．
D． Because scientists haven-t learnt enough about the deserts．
正确答案：C
26.C【解析】文章第一段提供的信息表明良田变成了沙漠是人为的。故此题选C。 -
第6题：
Why do the American doctors think of using laser light to treat heart disease?
A．Beeause laser light is quite powerful．
B．Because laser light is penetrating．
C．Because laser light can destroy the blocking materials in human’s artery．
D．Because laser light can travel through the human body．
正确答案：C
根据文章第二段开头一句，可知激光能够清除动脉里的脂肪物质，因此答案应是C项。 -
第7题：
29． Why do people like teleshopping?
A． Because they like watching TV．
B． Because they can do some shopping at home，
C． Because they like the heavy traffic．
D． Because they think the things on TV are good．
正确答案：B
29.B【解析】主要原因就是不出家门就可以买东西。 -
第8题：
共用题干
第一篇
Putting Plants to Work
Using the power of the sun is nothing new.People have had solar-powered calculators and buildings with
solar panels（太阳能电池板）for decades. But plants are the real experts. They' ve been using sunlight as an
energy source for billions of years.
Cells in the green leaves of plants work like tiny factories to convert sunlight, carbon dioxide（二氧化
碳）,and water into sugars
and starche（淀粉）,stored energy that the piants can use. This conversion
process is called photosynthesis (光合作用）Unfortunately, unless you' re a plant, it's difficult and
expensive to convert sunlight into storable energy. That's why scientists are taking a closer look at exactly
how plants do it.
Some scientists are trying to get plants,or biological cells that act like plants, to work as very small
photosynthesic power stations. For example, Maria Ghirardi of the National Renewable Energy Laboratory in
Golden. Cobo.,is working with green algae（水藻）.She's trying to trick them into producing hydrogen
instead of sugars when they perform photosynthesis. Once the researchers can get the algae working efficient-
ly ,the hydrogen that they produce could be used to power fuel cells in cars or to generate electricity.
The algae are grown in narrow-necked glass bottles to produce hydrogen in the lab. During photosynthe-
sis , plants normally make sugars or strchds. "But under certain conditions,a lot of algae are able to use the
sunlight energy not to store starch , but to make hydrogen."Ghirardi says. For example ,algae will produce hy-
drogen in an airfree environment. It' s the oxygen in the air that prevents algae from making hydrogen most of
the time.
Working in an airfree environment, however, is difficult. It's not a practical way to produce cheap
energy. But Ghirardi and her colleagues have discovered that by removing a chemical called sulfate（硫酸盐）
from the environment that the algae grow in, they will make hydrogen instead of sugars,even when air
is present.
Unfortunately, removing the sulfate also makes the algae's cells work very slowly,and not much
hydrogen is produced. Still ,the researchers see this as a first step in their goal to produce hydrogen efficiently
from algae. With more work,they may be able to speed the cells' activity and produce larger quantities
of hydrogen.
The researchers hope that algae will one day be an easy-to-use fuel source. The organisms are cheap to
get and to feed, Ghirardi says,and they can grow almost anywhere:"You can grow them in a reactor, in a
pond. You can grow them in the ocean. There's a lot of flexibility in how you can use these organisms."Scientists study how photosynthesis works because they want to_______________.
A: improve the efficiency of it
B: turn plant sugars to a new form of energy
C: get more sugars and starches from plants
D: make green plants a new source of energy答案：D解析：由第一段第三、四句话“But plants are the real experts.They' ye been using sunlight as an energy source for billions of years.”可知答案。
文章的第三段说，科学家企图将植物或植物类生物细胞作为微型光合作用能源供应站 来研究，并举例说，他们正在用绿藻进行实验，若成功，绿藻所产生的氢气将可用来为汽车的燃 料电池充电。所以答案是D。
由文章第四段最后两句“…algae will produce hydrogen in an airfree environment.It' s the oxygen in the air that prevents algae from making hydrogen most of the time.（……绿藻在没有空气 的环境下能产生氢气，是空气中的氧气在阻止绿藻制造氢气。）”可知选B。
A、B都不是正确答案，因为短文的第五段、第六段告诉我们，remove the sulfate和work in an airfree environment都是可能的，但问题是两者都有弊端，使氢气的制造不那么容易。C所 述内容就是困难之一：绿藻细胞因为没有了sulfate而减缓工作速度，因此产生不了多少氢气。 D项与第四段末尾所说的“是空气中的氧气在阻止绿藻制造氢气”矛盾。故选C。
根据最后一段Ghirardi所说的话可知，绿藻可以在任何地方生长，而且用途广泛，联系 此段首句可知Ghirardi所说的意在表示绿藻易于广泛应用，有望成为一种好的能源。故选A。 B项未提到，C项“它们将被到处种植”也不是Ghirardi的话的真正意思，他只是说绿藻易于广 泛种植。D项是对文中“feed”一词所在句的错误理解，feed在此意为“养”。第二篇 文章主要讲的是公共土地在美国能源生产方面的重大作用，分别从产量、税收、未开发的传 统能源、替代能源占全国的份额以及能源开发需求等方面进行了介绍。 -
第9题：
共用题干
Green Energy
1.Green energy is energy that is produced in a manner that has, less of a negative impact to the environment than energy sources like fossil fuels,which are often produced with harmful side effects."Greener" types of energy that often come to mind are solar,wind,geothermal and hydro energy.There are several more,even including nuclear energy,that is sometimes considered a green energy source because of its lower waste output relative to energy sources such as coal or oil.
2.The goal of green energy is generally to create power with as little pollution as possible produced as a by-product. Every form of energy collection will result in some pollution,but those that are green are known to cause less than those that are not. Most people who advocate greener sources of energy claim that the result of worldwide use of green energy will result in the ability to preserve the planet for a longer time.Greenhouse gases,a by-product of traditional sources of energy such as fossil fuels are thought to be causing global warming,or the process of the Earth heating up at an accelerated pace.
3.It is not completely necessary for green energy sources to come from places like solar or wind fields,which are examples of green"power plants".A green energy source can be a building that is designed in a way that it keeps itself cool in the daytime and heated in the night through its architectural design rather than having an air-conditioning or a heating system. The conservation of energy through architectural（建筑学的）design becomes, itself, a green energy source. Similarly, many sources of green energy can come directly from the area in which the energy is needed rather than from an outside source.
4.One of the goals of green energy technology is to take existing fossil fuel energy technology and clean it up so it is produced more cleanly. One such case is that of clean coal technology,where scientists are trying to find ways to extract energy from coal and other fossil fuels without all of the harmful side effects.The success of such these types of green energy depend upon the ability to extract harmful by-products from fossil fuels while not only being energy efficient,but by being cost efficient as well.Paragraph 3______
A:Why Do We Develop Green Energy?
B:What Is the Goal of Green Energy?
C:What Is the Weakness of Green Energy?
D:What Is a Green Energy?
E:How Much Does the Green Energy Cost Every Year?
F: How Many Kinds of Green Energy We Can Take Use of?答案：F解析：文中第一段第一句中Green energy is energy that is…这种表述方法符合科学说明文的记叙方式，首先对一个名词进行科学定义，所以本题答案为D。
文中第二段第二句：Every form of energy collection will result in some pollution, but those that are green are known to cause less than those that are not．任何形式的能源收集都会产生一定程度的污染，但是绿色能源比其他能源造成的污染要少。可以推测出这一段是在讲绿色能源的优点，也就是说为什么要发展绿色能源，所以选择A。
文中第三段第一句：It is not completely necessary for green energy sources to come from places like solar or wind fields．可以得出，本段主要讲述了我们传统认为的新能源，还有其他种类的新能源，所以选择F。
文中第四段第一句：One of the goals of green energy technology is to take existing fossil fuel energy technology and clean it up so it is produced more cleanly．可以得出，该段主要是在讲新能源的目标和意义。
第一段最后一句：There are several more, even including nuclear energy, that is sometimes considered a green energy source because of its lower waste output relative to energy sources such as coal or oil．可知，核能经常被视作绿色能源，因为相比煤和石油，它的能源输出效率更高。由此可以得出选项C正确。
文中第二段最后一句：Greenhouse gases, a by-product of traditional sources of energy such as fossil fuels are thought to be causing global warming,or the process of the Earth heating up at an accelerated pace.温室气体，一种诸如化石能源的传统能源产生的副产品被认为会导致全球变暖，甚至使地球自转速度加快。因此可以得出A选项正确。
第三段最后两句：The conservation of energy through architectural design becomes,itself,a green energy source .Similarly,many sources of green energy can come directly from the area in which the energy is needed rather than from an outside source．通过自身的建筑设计来保存能源本身就是一种绿色能源的来源。同样道理，许多绿色能源可以直接来源于有能源需求的地区内部而不是外部。由此可以得出D选项正确。
最后一段最后两句：The success of such these types of green energy depend upon the ability to extract harmful by-products from fossil fuels while not only being energy efficient, but by being cost efficient as well．这些清洁能源技术的成功取决于人们从化石燃料中排除有害副产品、高效利用能源、同时降低成本的能力。由此可以得出E选项正确。 -
第10题：
Why is QoS important in a converged network?（）
- A、Because data does not need to arrive intact, so data transfer rates can be variable
- B、Because lost voice-data packets must be retransmitted
- C、Because voice data packets should arrive quickly and sequentially, and with no lost data
- D、Because voice data packets must follow a single dedicated path through the network
正确答案:C -
第11题：
单选题Why do students like the self-protection lesson?①Because there are no tests.②Because the lessons are boring.③Because they can learn how to save lives.④Because they can know how to stop danger before it happens.A①②
B②③
C①②④
D①③④
正确答案： D解析：
【文章大意】本文是一篇说明文。文章主要介绍了在几种紧急危险情况下的一些自我保护的措施。
细节理解题。由第一段最后两句“Students like this lesson because there are no exams or boring classes. And they can learn how to save lives and know how to stop danger before it really happens.”可知，①③④ 符合文意。 -
第12题：
单选题When making landfall at night，you can determine if a light is a major light or an offshore buoy by（）.Athe intensity of the light
Bchecking the period and characteristics against the Light List
Cthe color，because the buoy will have only a red or a green light
DAny of the above can be used to identify the light
正确答案： A解析： 暂无解析 -
第13题：
5． —Why do you like Beijing Opera?
—Because I can _______a lot _________Chinese history．
A． learn; about
B． study; about
C． learn; for
D． study; for
正确答案：A
5.A 【解析】learn a lot/much about sth.意为“对某事了解很多，得知有关某事的很多东西”。 -
第14题：
Many animals ____ green plants for their food.
A. carry out
B. base on
C. depend on
D. look for
正确答案：C
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第15题：
Why was Mrs. Green surprised? __________ .
A. Because her husband didn’t arrived the airport on time
B. Because her husband was still at the airport at 5 o’clock
C. Because her husband didn’t want to go to London
正确答案：B
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第16题：
24． The reason why most plants can’t grow on the sandy beach is that
A． there isn't enough sunlight
B． there is too much water
C． it is too crowded there
D． it has little food for plants
正确答案：D
24.D【解析】由文章最后一句可知沙滩里没有植物生长所需要的养分。 -
第17题：
30． Which is the best title for the passage?
A． The Desert Problem
B． People Make Deserts
C． Green Plants and Grass
D． The Desert，the Tree and the Water
正确答案：A
30.A【解析】作者在文章中叙说和阐明的观点与问题是地球土壤沙漠化的问题。故选A。 -
第18题：
．Why do Americans like to go to fast food restaurants?
A．It is because fast food restaurants are fast，informal，and inexpensive．
B．It is because people can easily find fast food restaurants．
C．It is because people like to eat hamburgers．
D．It is because fast food restaurants sell nearly every kind of food．
正确答案：A
根据文章第三自然段中的内容“customers can wear any type of dress whenthey go to a fast food place”可以推断到快餐店就餐可不拘礼节；“Second，they are fast”表示(第二点)快餐店食品供应速度快；“Finally most food in a fast food restaurant is not expensive”说明快餐店的又一特点是大多数食物都不贵。由此可选择出正确答案。 -
第19题：
Why do German and French babies produce different types of cries according to the research?A.Because they can control what they hear.
B.Because they can control their different breathing patterns
C.Because they don't share the same physiological structure
D.Because they can somehow control their sound production.答案：D解析：推断题。根据原文第三段提到的“This study refutes that claim: since babies cry in different languages，they must have some control…showing that the sound of their cries isunder their control.”可知，法国婴儿与德国婴儿虽然具有相同的生理结构，但他们可以发出不同类型的哭声，这是因为他们可以控制自己的发声。故本题选D。 -
第20题：
共用题干
We Need Green Space
Decades ago,any open field,any vacant lot,any group of trees were the places where children played.As families left family farms,small towns,and the countryside,and moved into cities,the places for their children to play in became rarer.(46)_________
In fact,all people's lives change a lot when they move to the city. In cities,homes are built on top of one another in enormous apartment buildings.The feeling of private space and ownership no longer exists in houses literally piled one on the other.
Psychologists have been studying the changes people experience when they leave rural areas and move into urban environments.(47)________Children can play on paved playgrounds.That's true.(48)_________Without grass and trees and bushes and,yes,dirt and mud to get dirty in, children miss an important part of childhood.The human soul,it seems,needs to stay close to its roots.
Adults can plant lots of things like bulbs in window boxes and large containers.(49)_________ The lack of green space is now recognized and understood as a problem.
City planners一the people who design neighborhoods一have begun to work on a solution.They want to build more parks,but land in cities is quite costly.So they look for land that no one else wants.Along rivers,under power lines,near ditches and highways—(50)________Why not use these unused spaces for green areas?Neighborhood groups have coordinated their efforts to clean up the trash or garbage.Soil from new building projects in the city has been trucked by lorries into these areas.This soil has been dumped along the sides of rivers,and strong walls have been erected to hold it there.Trees and bushes have been planted;the roots of these plants will hold the soil, too,and the green leaves make the area beautiful.________（49）
A:However,they just don't have as much fun as children in small towns.
B:Children in the cities had few options,fewer choices of places to play.
C:Why is there no place children in cities to play?
D:One clear finding from their studies is that people need green spaces for better mental health.
E:However,tending window boxes isn't the same as being an amateur gardener and growing peas,tomatoes and salad greens in a backyard garden.
F:these are the spaces that no one uses and they are everywhere.答案：E解析：本段前文讲的是几十年前孩子们有很多地方玩耍，但当人们住进城镇后孩子们玩耍的地方少了，因此只有选项B“生活在城市的孩子没多少选择，可供他们选择去玩耍的地方更少了”最符合题意。
前一句讲的是“心理学家们一直研究人们在离开乡村搬到城市环境后所经历的变化”，而选项D中的核心词one clear finding与该句联系最紧，该选项的意思是：“他们的研究得出的一个清晰的结果是：为了更健康的心理，人们需要绿色的空间”。
空格后讲的是“没有了青草、没有了树木、没有了灌木，还有，没有了弄脏他们手脚和衣服的污物泥土，孩子们就失去了童年生活中的一个重要组成部分”，因为与本段前几句的意思是转接关系，需要一个转折句，而选项A“然而，他们并不能像生活在小城镇里的孩子们那样玩得开心”最符合要求。
文章前一句讲“大人们可以在窗台前花坛和大的容器里种上各种球茎状的植物”，与该句关系最近的是选项E“但是在窗前花坛里种植些植物与做一个业余园丁、在后花园里种豌豆、西红柿和做色拉用的绿叶蔬菜可大不一样”。
文章前面讲的是城市规划人员寻找没人要的土地，与之相关的仅有选项F“这些地方没人用，而且到处都有”。 -
第21题：
共用题干
Green Energy
1.Green energy is energy that is produced in a manner that has, less of a negative impact to the environment than energy sources like fossil fuels,which are often produced with harmful side effects."Greener" types of energy that often come to mind are solar,wind,geothermal and hydro energy.There are several more,even including nuclear energy,that is sometimes considered a green energy source because of its lower waste output relative to energy sources such as coal or oil.
2.The goal of green energy is generally to create power with as little pollution as possible produced as a by-product. Every form of energy collection will result in some pollution,but those that are green are known to cause less than those that are not. Most people who advocate greener sources of energy claim that the result of worldwide use of green energy will result in the ability to preserve the planet for a longer time.Greenhouse gases,a by-product of traditional sources of energy such as fossil fuels are thought to be causing global warming,or the process of the Earth heating up at an accelerated pace.
3.It is not completely necessary for green energy sources to come from places like solar or wind fields,which are examples of green"power plants".A green energy source can be a building that is designed in a way that it keeps itself cool in the daytime and heated in the night through its architectural design rather than having an air-conditioning or a heating system. The conservation of energy through architectural（建筑学的）design becomes, itself, a green energy source. Similarly, many sources of green energy can come directly from the area in which the energy is needed rather than from an outside source.
4.One of the goals of green energy technology is to take existing fossil fuel energy technology and clean it up so it is produced more cleanly. One such case is that of clean coal technology,where scientists are trying to find ways to extract energy from coal and other fossil fuels without all of the harmful side effects.The success of such these types of green energy depend upon the ability to extract harmful by-products from fossil fuels while not only being energy efficient,but by being cost efficient as well.Nuclear energy is sometimes considered a green energy source because of its______.
A:global warming
B:carbon emission
C:lower waste output
D:a green energy source
E:fossil fuels
F: clean fuels答案：C解析：文中第一段第一句中Green energy is energy that is…这种表述方法符合科学说明文的记叙方式，首先对一个名词进行科学定义，所以本题答案为D。
文中第二段第二句：Every form of energy collection will result in some pollution, but those that are green are known to cause less than those that are not．任何形式的能源收集都会产生一定程度的污染，但是绿色能源比其他能源造成的污染要少。可以推测出这一段是在讲绿色能源的优点，也就是说为什么要发展绿色能源，所以选择A。
文中第三段第一句：It is not completely necessary for green energy sources to come from places like solar or wind fields．可以得出，本段主要讲述了我们传统认为的新能源，还有其他种类的新能源，所以选择F。
文中第四段第一句：One of the goals of green energy technology is to take existing fossil fuel energy technology and clean it up so it is produced more cleanly．可以得出，该段主要是在讲新能源的目标和意义。
第一段最后一句：There are several more, even including nuclear energy, that is sometimes considered a green energy source because of its lower waste output relative to energy sources such as coal or oil．可知，核能经常被视作绿色能源，因为相比煤和石油，它的能源输出效率更高。由此可以得出选项C正确。
文中第二段最后一句：Greenhouse gases, a by-product of traditional sources of energy such as fossil fuels are thought to be causing global warming,or the process of the Earth heating up at an accelerated pace.温室气体，一种诸如化石能源的传统能源产生的副产品被认为会导致全球变暖，甚至使地球自转速度加快。因此可以得出A选项正确。
第三段最后两句：The conservation of energy through architectural design becomes,itself,a green energy source .Similarly,many sources of green energy can come directly from the area in which the energy is needed rather than from an outside source．通过自身的建筑设计来保存能源本身就是一种绿色能源的来源。同样道理，许多绿色能源可以直接来源于有能源需求的地区内部而不是外部。由此可以得出D选项正确。
最后一段最后两句：The success of such these types of green energy depend upon the ability to extract harmful by-products from fossil fuels while not only being energy efficient, but by being cost efficient as well．这些清洁能源技术的成功取决于人们从化石燃料中排除有害副产品、高效利用能源、同时降低成本的能力。由此可以得出E选项正确。 -
第22题：
单选题Why do some people get sick after drinking the water from the river?ABecause the river is polluted
BBecause the river makes the earth more beautiful
CBecause the river can only offer water to animals
DBecause there are too many animals and plants in the river
正确答案： C解析：
题目问的是“为什么一些人在喝了河水之后生病了”，由The river的描述可知，树很难过，因为人类向河水中排放废物，这些废物杀死了许多喝我的河水的动物和植物。一些人喝了这种水也生病了，因此答案为A项，意思是“因为河流受到了污染”。 -
第23题：
单选题Why switch grass and Miscanthus were taken as energy plant?ABecause they contain more cellulose.
BBecause genomes have been sequenced for clues to make other plants better energy crops.
CBecause some scientists are breeding a wide variety o[Candidate crops.
DBecause the spotlight is on this underdeveloped field.
正确答案： A解析：
事实细节题。由题干关键词switch grass and Miscanthus定位至第三段。由段中switch grass and Miscanthus, both considered good candidates for energy crops because of their high cellulose content.可直接判断A正确。