练习册

  • 练习册
  • 试题
    精英家教网 > 初中英语 > 题目详情
    Today there are 6.4 billion people on the earth. By the year 2050 there may be 12.5 billion . There are a lot of people to feed. We need more  and more food.
    One way to produce more food is growing stronger plants. For thousands of years, farmers have made plants better. Every season, they pick the best plants for the next season. It works very slowly. Since 1983, scientists have been able to change plants more quickly by changing their genetic（遗传的） material. Foods from plants grown in this way are called genetically modified(改变的) foods, or GM foods.
    By changing the genetic material of a plant, it is possible to make new plants. They make plants which are strong against plant diseases. They can also help in our diseases; a kind of rice is being prepared , for example , which stops people becoming blind.
    Rich countries produce GM foods because they are easy to grow and bring in more money. Poor countries are interested in them because they help produce more food.
    GM plants are not natural. No one knows how good or bad they are,. Making GM foods is only one way of feeding people in 2050. There are strong feelings against them, because they are unnatural. They may feed people , then hurt them or their children later. But both rich and poor countries are interested in their use, and they are not going to go away. In 2050, we may think differently about them.
    小题1:GM foods are made by                 
    A. farmers            B. workers      C. scientists          D plants
    小题2:What are the good things about GM foods  ?
    A. They make plants strong against diseases.   B. They are unnatural.
    C. They can help in human diseases.            D  Both A and  C.
    小题3:GM foods        .
    A. are a quick way to produce food    B. grow in the wild 
    C. are safe                           D are grown only in rich countries
    小题4:Why do some people not like GM foods?
    A. They are not useful.       B. They are not helpful.
    C. They are not natural.      D  They are not cheap.
    小题5:From the passage we know that      .
    A．GM foods will disappear one day in the future
    B．GM foods will not disappear in the future
    C．People will not be interested in GM foods.
    D．People will have to stop using GM foods

    小题1:C
    小题1:D
    小题1:A
    小题1:C
    小题1:B

    1. C 根据Since 1983, scientists have been able to change plants more quickly by changing their genetic（遗传的） material可知是由科学家制造出来的，选C。
    2. D 此题讲的是这些遗传基因改变的食物的优点，定位到第三段。从They make plants which are strong against plant diseases. They can also help in our diseases可知A和C都是其中的一个方面，故选D。
    3. A 细节题的考查。从because they help produce more food可知它们能够帮助产生更多的食物，故是一种快速生产食物的途径，故选A。
    4. C 本题问的是人们不喜欢的原因，从There are strong feelings against them, because they are unnatural人们强烈反对是因为它们不是自然的，故选C。
    5. B 此题是推测类型的题。根据文章倒数第二句But both rich and poor countries are interested in their use, and they are not going to可知它们不会消失（go away），相当于disapper,故选B。
    练习册系列答案
    年级 高中课程 年级 初中课程
    高一 高一免费课程推荐！ 初一 初一免费课程推荐！
    高二 高二免费课程推荐！ 初二 初二免费课程推荐！
    高三 高三免费课程推荐！ 初三 初三免费课程推荐！
    相关习题

    科目：初中英语 来源：不详 题型：阅读理解

    When we look at the moon through a telescope(望远镜), we can see lines and circles(圆形物). People used to(过去常常) think that this was the moon’s face and that there was a man in the moon! This is not true. There is no man in the moon.
    　　What do we know about the moon? First of all, the moon is much smaller than the earth. Days and nights on the moon are very long. One day on the moon is as long as two weeks on the earth. One night is also as long as two weeks on the earth. In the daytime the moon is very hot and at night is very cold.
    小题1:On the moon ____________.
    A．there is a man　B．there is a woman　
    C．there are a lot of people　D．there is no man
    小题2:Now we know _____________________.
    　　   
    A．some facts about the moonB．nothing about the moon
    　　    		C．little about the moonD．few facts about the moon
    小题3:Which of the following is true?
    A．The moon is bigger than the earth.
    B．The earth is much bigger than the moon.
    C．The moon is as big as the earth.　
    D．The earth isn’t as big as the moon.
    小题4: One day on the moon is as long as ______________.
    　　   
    A．seven days on the earthB．fourteen days on the earth.
    　　    		C．240 hours on the earthD．two years on the earth
    小题5:The moon is very hot _____________.
    A．all the time　B．during the night　
    C．in the daytime　D．at night and in the daytime

    查看答案和解析>>

    科目：初中英语 来源：不详 题型：阅读理解

    Can plants eat people? Probably not，but there are many plants that eat meat．Some of them are big．And they can eat small animals．One famous meat-eating plant is the Venus flytrap(捕蝇草)．
    The Venus flytrap is a very strange plant．It grows in dry parts of the United States．Its leaves are like the pages of a book．They can open and close very quickly．Inside the leaves，there are three small hairs．If a fly touches one of the hairs，the leaf closes quickly．The fly cannot get out．In about half an hour，the leaf presses the fly until it is dead．Then，the plant covers the fly．Slowly，the plant eats the fly．
    Why do plants do it? Most plants get what they need from the sun，the air，and the ground．In some places，the ground is very poor．It doesn’t have all these important things，
    especially nitrogen(氮)．Animal meat has a lot of nitrogen， so some plants eat meat to get what they need．Let’s hope that some of the bigger plants don’t get the same idea !
    小题1:The Venus flytrap is a kind of_________．
    A．plantB．animalC．foodD．meat
    小题2:The Venus flytrap grows in_________．
    A．most parts of the worldB．some parts of Africa
    C．dry parts of the United StatesD．wet parts of England
    小题3:From the passage，we learn that_________．
    A．all plants can eat peopleB．all plants can eat animals
    C．some plants can eat peopleD．some plants can eat animals
    小题4:The underlined word“presses”probably means________ in Chinese．
    A．挤压B．关上C．打开D．松开
    小题5:—Why do some plants eat animal meat? —Because_________．
    A．plants are dangerous to animals
    B．animals are dangerous to plants
    C．plants want to get what they need from animal me
    D．plants want to protect themselves against animals

    查看答案和解析>>

    科目：初中英语 来源：不详 题型：阅读理解

    All living things on the earth need other living things to live. Nothing lives alone. Most animals must live in a group, and even a plant grows close together with others of the same kind. Sometimes one living thing kills another, one eats and the other is eaten. Each kind of life eats another kind of life in order to live, and together they form a food chain(食物链).Some food chains are simple, while others are not. But all food chains begin with the sun, and all food chains become broken up if one of the links disappears.
    All life needs sunlight to live on. But only plants can use sunlight directly. Plants are“factories”.They make food from sunlight, water and things in the soil and air.
    Plants feed all other living things. Animals can only use the sun’s energy after it has been changed into food by plants. Some animals feed directly on plants, others eat smaller animals. Meat-eating animals are only eating plants indirectly.
    What about human beings? We are members of many food chains. We eat wheat, rice, vegetables, fruits and so on. We also eat meat and drink milk. But men often break up the food chains. They kill wild animals. They also make rivers, lakes and seas dirty. When these rivers, lakes and seas are polluted, the fish in them cannot be eaten. If men eat the fish, they will get strange diseases.
    Each form of life is linked to all others. Breaking the links puts all life in danger. 
    小题1:How does every living thing on the earth live?
    A. Each plant can live alone.
    B. Each animal can live alone.
    C. Every living thing on the earth cannot live without others.
    小题2:Which living things can use the sun’s energy directly?
    A. Animals      B. Plants         C. All living things
    小题3:Who often break up the food chains?
    A. Human beings
    B. Animals
    C. Plant and animals
    小题4: Which of the following do you think is the best title of this passage?
    A. Animals         B. Plants       C. Food Chains    
    小题5:Where can you probably find this passage?
    A. In a news report.
    B. In your textbook.
    C. In a business magazine.

    查看答案和解析>>

    科目：初中英语 来源：不详 题型：阅读理解

    What’s the red star in the sky through a telescope(望远镜)? It is Mars. Do you want to know more about it? Take the “Mars Orbit Express”!
    “Mars Orbit Express” is a space probe (探测器). It was sent towards Mars by American scientists on August 12th，2005. Its tasks are to study Mars’ atmosphere and return photos to Earth. But before that “Mars Orbit Express” must travel about 100 hundred million kilometers and seven months. It reached Mars’ orbit(轨道)in March，2006.
    Mars and Earth have similar weight and size. However，Mars is closer to the sun than Earth. Mars is very cold. The average temperature is below 50℃. The temperature at noon only reaches 20℃ during a Mars day. Its atmosphere is mostly CO2. It has much sand and two moons---Phobos and Deimos.
    Scientists think Earth and Mars had similar beginnings 4.6 billion years ago. But while Earth supports millions of lives，Mars becomes bad. “Earth easily could have turned out like that.” said an scientist, “It is important for us to find out why and Mars Orbit Express’ should do that.” “Mars Orbit Express” also would help scientists to learn what might happen to Earth in the future.  “Mars Orbit Express” would work for about four years.
    小题1: What can you see through a telescope when watching Mars? ________.
    A．Much sandB．A red starC．Its atmosphereD．Its size
    小题2:One of the tasks of Mars Orbit Express is _______.
    A．taking pictures of Mars
    B．studying the weight of Mars
    C．finding out distance between Earth and Mars
    D．telling the time it takes to go from Earth to Mars
    小题3:Compared with Earth，_______.
    A．Mars has a long historyB．Mars is big and heavy
    C．Mars is close to the sunD．Mars’ atmosphere is mainly O2.
    小题4: Which might be the proper title for the passage?
    A．Mars：differences from EarthB．A probe：to learn more about Mars
    C．Mars: change of temperatureD．A probe：to tell the future of Earth

    查看答案和解析>>

    科目：初中英语 来源：不详 题型：阅读理解

    Do you know that women’s brains are smaller than men’s? Normally the women’s brain weighs 10% less than men’s. Since research has shown that the bigger the brain, the cleverer the animal, men must be more intelligent（聪明的） than women. Right? Wrong. Men and women always score similarly on intelligence tests, despite the difference in brain size. Why? After years of study, researchers have concluded that it’s what’s inside that matters, not just the size of the brain. The brain is made up of “grey matter” and “white matter”. While men have more of the white matter, the amount（数量）of “thinking” brain is almost the same in both men and women.
    It has been suggested that smaller brain appears to work faster, perhaps because the two sides of the brain are better connected in women. This means that little girls may learn to speak earlier, and that women can understand sorts of different information at the same time. When it comes to talking to the boss on the phone, cooking dinner and keeping an eye on the baby all at the same time, it’s women who come out on top every time.
    There are other important differences between two sexes（性别）. As white matter is the key to spatial（空间的）tasks, men know better where things are in relation to other things. “A great footballer always knows where he is in relation to the other players, and he knows where to go,” says one researcher. That may explain one of life’s great mysteries: why men refuse to ask for directions … and women often need to!
    The differences begin when fetuses（胎儿）are about nine weeks old, which can be seen in the action of children when they are very young. A boy would try to climb a barrier before him or push it down while a girl would ask for help from others. These brain differences also explain the fact that more men take up jobs that require good spatial skills, while more women speech skills. It may all go back to our ancestors, among whom women needed speech skills to take care of their babies and men needed spatial skills to hunt, according to one research.
    小题1:Which of the following is TRUE according to Paragraph 1?
    A．Grey matter controls thinking in the brain.
    B．Men’s brain is 10% less than women’s.
    C．Grey matter plays the same role as white matter.
    D．Men and women have the same amount of white matter.
    小题2:What can you infer from Paragraphs 2 and 3?
    A．Men have weaker spatial abilities.
    B．Women do not need to tell directions.
    C．Women prefer doing many things at a time.
    D．Women do many jobs at a time better than men.
    小题3:What can you learn from Paragraph 4?
    A．Our children needed more spatial skills.
    B．Women may have more feelings than men.
    C．Young boys may be stronger than young girls.
    D．More women take up jobs requiring speech skills.
    小题4: The passage is mainly about _______.
    A．ways of being more intelligent
    B．differences between men and women
    C．studies on brains between two sexes
    D．studies on white matter and grey matter

    查看答案和解析>>

    科目：初中英语 来源：不详 题型：阅读理解

    Do you want to be the most popular person in the class? You don’t need to change your character; you just need to improve your personality (人格). In fact, people trust and love the most popular people because they stay normal but still have something that makes them different from the rest of us. Here are some pieces of advice about becoming the most popular person in the class.
    ◆If you want others to like and respect (尊重) you, you have to start by liking and accepting yourself. Do not change yourself in order to please others.
    ◆Be helpful to everyone and do it happily. Being nice to people is almost like helping them, because by being nice you make others happy.
    ◆Be active and have a positive view towards life. Develop confidence in yourself.
    ◆Stay clean and wear fresh clothes. Do not try to follow fashion to please others.
    ◆Big words and power cannot bring you respect. You have to get it by being honest. It also helps your personal growth. You must be a person that can be trusted to get respect.
    小题1:If you want to become the most popular person, you should __________.
    A．improve your personalityB．trust and please others
    C．change your characterD．make yourself different from others
    小题2:According to the article, __________ can bring you respect.
    A．following fashionB．using big words
    C．being honest and helpfulD．saying hello to others every day
    小题3:The underlined sentence shows that __________.
    A．you should be polite when you help othersB．you should make yourself happy[
    C．we can help others only by being happyD．you should always be nice to others

    查看答案和解析>>

    科目：初中英语 来源：不详 题型：阅读理解

    You are probably familiar with the saying：An apple a day keeps the doctor away. A recent research carried out by the Chinese University of Hong Kong may change the saying:
    An apple a day may keep aging away.
    The research chose fruit flies(果蝇), as they share many genes(基因)with humans. The fruit flies were either fed normally or had an apple extract(浓缩物) added to their diet.
    It turned out that those fruit flies that were given apple extract lived about 55 days—five days longer than the flies that were normally fed. The research group also found it easier for the flies to walk，climb and move about as they aged.
    According to the result, the researchers believed that the antioxidants(抗氧化剂) in the apple extract helped clean up dangerous chemicals(化学物质) that cause illnesses，as well as aging.
    In another study，researchers examined diets of thousands of women. They discovered that those who regularly ate apples were 20 percent less likely to suffer heart illnesses and stroke.
    The apples’ genetic code(遗传密码) was discovered recently. It allows scientists to develop nicer and healthier fruits. Researchers are already using the information to grow a kind of apples full of antioxidants that can keep eyes and joints healthy and protect humans against heart illnesses and cancer.
    Apples that kill the desire(欲望) to eat could also be produced, with the first“extra-healthy’’apples on supermarket shelves within just four or five years.
    The team that keeps studying apple DNA includes 100 scientists from five countries. Their research also suggests that around 65 million years ago, when dinosaurs began to die off the plant，which would finally become today’s apple tree, experienced a great genetic change. The number of many of its genes doubled. The extra genes allowed the apple to get used to worse conditions and go through a different development from peaches，strawberries and other related fruits.
    小题1:Why were fruit flies used for the research?
    A．Because they have a similar diet to humans.
    B．Because they have a history as long as apples.
    C．Because they share a lot of genes with humans.
    D．Because they feed on nothing but apple extract.
    小题2:What result did the researchers find out?
    A．Apples produce chemicals that can change human genes.
    B．Apples have antioxidants that kill chemicals that cause aging.
    C．Apples are rich in vitamins that are needed in humans’bodies.
    D．Apples produce chemicals that make apples taste more delicious.
    小题3:What happened to apples around 65 million years ago according to the research?
    A．Their genes stopped their development as the environment got worse.
    B．Their genes became twice in number but they finally died off like dinosaurs.
    C．They experienced a great genetic change making them used to worse conditions.
    D．They went through a similar development to peaches, strawberries and other related fruits.
    小题4:What can we infer(推断)from the passage?
    A．Eating apples may bring us more advantages than we might believe before.
    B．People who have the habit of eating apples don’t need to see a doctor.
    C．Apples that kill the desire to eat are already available in supermarkets now.
    D．People will eat apples instead of peaches and strawberries from now on.

    查看答案和解析>>

    科目：初中英语 来源：不详 题型：阅读理解

    The earth moves round the sun, and the moon moves round the earth. When our part of the earth turns to the moon, it is night.
    The sun is much bigger than the moon. But sometimes the moon looks bigger than the sun, because it’s much nearer to the earth.
    The sun is very bright. It gives a very strong light. The moon looks quite bright,  too. But it doesn’t give any light at all.
    The moon looks much bigger and brighter than the stars. But actually the stars are much bigger and brighter than the moon. They look smaller than the moon because they’re much farther away from us.
    Read and choose the right answer
    小题1:____moves round________.
    A．The earth; the moonB．The moon; the earth
    C．The moon; the starsD．The sun; the earth
    小题2:Sometimes the moon looks bigger than the sun, because_________.
    A．it is much bigger than the sun
    B．it comes out only at night
    C．it is much nearer to the earth than the sun
    D．it doesn’t give a strong light
    小题3:The sun_______________.
    A．is very bright, and it gives a very strong light
    B．isn’t bright, but it gives a very strong light
    C．is very big, but it doesn’t give any light at all
    D．is very round, but it can’t move round
    小题4:The stars______________.
    A．look much bigger than the moon
    B．look much bigger than the sun
    C．are a lot brighter than the moon, but they are not bigger than the moon
    D．are much farther away from us than the moon

    查看答案和解析>>

    同步练习册答案