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(果蠅), as they share many genes(基因)with humans. The fruit flies were either fed normally or had an apple extract(濃縮物) 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(抗氧化劑) in the apple extract helped clean up dangerous chemicals(化學(xué)物質(zhì)) 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(遺傳密碼) 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.
小題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.
小題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.
小題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.
小題4:What can we infer(推斷)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.

小題1:C
小題1:B
小題1:C
小題1:A
【主旨大意】一天一個蘋果，疾病遠(yuǎn)離我，可最近一項研究表明，一天一個蘋果，有助于抗老化。
小題1:The research chose fruit flies(果蠅), as they share many genes(基因)with humans.可以看出。
小題1:根據(jù)“According to the result, the researchers believed that the antioxidants(抗氧化劑) in the apple extract helped clean up dangerous chemicals(化學(xué)物質(zhì)) that cause illnesses，as well as aging.”
小題1:根據(jù)“when dinosaurs began to die off the plant，which would finally become today’s apple tree, experienced a great genetic change.”
小題1:吃蘋果會給我們帶來更多的優(yōu)點(diǎn)比我們可能相信之前。
練習(xí)冊系列答案
相關(guān)習(xí)題

科目：初中英語 來源：不詳 題型：完形填空

We kids have different ways to get in touch with each other now. And for the old, they’d like to go to the market or     26      each other’s houses, but for the young, we kids needn’t follow the     27     of doing so.
The easiest way for us to get in touch and make    28     is to use the Internet services, like QQ. A lot of websites such as www.qq.com have     29    in the last few years and offered such kinds of     30     for free. So we can make friends    31     through the Internet. Maybe we do not    32    all these “friend” well. We add friends only    33    we seem cooler with more friends online.
Then how do we kids keep in touch with friends online? We make it by posting our     34      to each other. At times , “friends”     35     “be missing” for months without a message. Is this the friendship in the 21st century?
Of course, using these Internet services is not     36    for saying “ Hi, what’s up?” Some of us have found long-lost classmates and friends     37    these websites. And at times we     38  a time to go to a movie or get together. What’s more, we kids can      39     our friends’ favourite music when we are on the Internet.
Believe it or not, these Internet services will be    40     for a while, and it is really a convenient way for us to keep in touch.
小題1:
A．visitB．enjoyC．likeD．build
小題2:
A．chancesB．thoughtsC．waysD．plans
小題3:
A．quarrelsB．friendsC．sentencesD．jokes
小題4:
A．goneB．hadC．turnedD．a(chǎn)ppeared
小題5:
A．computersB．servicesC．booksD．rooms
小題6:
A．easilyB．loudlyC．a(chǎn)ctuallyD．early
小題7:
A．learnB．knowC．hearD．teach
小題8:
A．ifB．whenC．becauseD．how
小題9:
A．moneyB．paperC．positionsD．messages
小題10:
A．mustB．willC．mayD．shall
小題11:
A．a(chǎn)lreadyB．a(chǎn)lsoC．justD．yet
小題12:
A．throughB．forC．ontoD．into
小題13:
A．spendB．killC．fixD．last
小題14:
A．listen toB．hear fromC．look atD．feel like
小題15:
A．difficultB．popularC．dangerousD．polite

查看答案和解析>>

科目：初中英語 來源：不詳 題型：閱讀理解

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（遺傳的） material. Foods from plants grown in this way are called genetically modified(改變的) 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.
小題1:GM foods are made by                 
A. farmers            B. workers      C. scientists          D plants
小題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.
小題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
小題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.
小題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

查看答案和解析>>

科目：初中英語 來源：不詳 題型：閱讀理解

Liu Xu is a student from a middle school in Guangxi. Once he was riding home when a  robber (盜賊) suddenly jumped out from the roadside. He pulled Liu Xu off his bike and rode away. Liu Xu was scared, but he didn’t run after the robber. He found a telephone and called the police at 110.
“Safety is the first important in such a situation,” Liu said, remembering what his teacher had told him in his first aid class. “It is not safe to run after an adult who is stronger than you.”
Liu’s school has compulsory (必修的) first aid education. Students must take the class once a week.
Teenage safety has become a serious issue recently. According to a survey, about 16,000 teenagers die in accidents in China every year.
At Liu’s school the first aid classes are to “teach students skills how to protect and save  themselves in emergencies (緊急情況)”. Students there often learn by role-playing in first aid classes. For example, one student performed as a stranger knocking at a door. Another one stood inside the door and asked several questions before letting the “stranger” in. Then they changed roles and did it again. They learned a lot while having fun at role-playing.
The topics of the first aid classes are regularly updated (適時的). The students have learned skills for surviving in earthquakes. The teacher also taught the students not to go out at night. If someone tried to do bad things to them, they should quickly run into crowed place.
小題1: Liu Xu’s _________ was robbed according to the passage.
A．moneyB．bikeC．backpackD．mobile phone
小題2:What did Liu Xu remember when he met the robber?
A．Safety is the first important.B．How to run away from an earthquake.
C．To run after the robber quickly.D．Not to go out at night.
小題3:Students in Liu’s school must have compulsory first aid class __________.
A．once a dayB．twice a dayC．once a weekD．twice a week
小題4:The underlined word “stranger” is __________ here.
A．a(chǎn) robberB．a(chǎn) studentC．a(chǎn) teacherD．a(chǎn) real stranger
小題5:The best title for the passage is __________.
A．Teenage SafetyB．A Robbery (搶劫)
C．Importance of SafetyD．Life-saving Classes

查看答案和解析>>

科目：初中英語 來源：不詳 題型：閱讀理解

In the United States, children start school when they are five years old. In some states they must stay in school until they are sixteen. Most students are seventeen or eighteen years old when they leave secondary（中等的） schools. There are two kinds of schools in the United States: public schools and private（私立的）schools . Most children go to public schools. Their parents do not have to pay for their education because the schools receive money from the government. If a child goes to a private school, his parents have to get enough money for his schooling. Some parents still prefer private schools, though they are much more expensive. Today about half of the high school students go to universities after they finish the secondary school. A student at state university does not have to pay very much if his parents live in that state. But many students work while they are studying at universities. In this way they develop good working habits and live by their own hands.
小題1: Children can go to school at the age of four in the U.S.
小題2:Most parents prefer to send their children to private schools in America.
小題3:About fifty percent of high school students can go on to universities after they leave the secondary school today.
小題4:Lots of American students go to universities by depending on their parents completely (完全地).
小題5:The passage is mainly about American education.

查看答案和解析>>

科目：初中英語 來源：不詳 題型：閱讀理解


After spending years searching for a planet with life, scientists may have found one. In September 2010, a team of US scientists discovered an Earth-sized planet called Gliese 581g. It has a surface temperature neither too hot nor too cold for liquid（液態(tài)）water. Scientists think there is a chance that the planet could have life.
The planet Gliese 581g goes around a star called Gliese 581, which is about 20 light-years from Earth. That is about 194 trillion（萬億）kilometres －500 million times farther away from us than the moon.
A spacecraft traveling at a one-tenth of the speed of light would reach Gliese 581g within about 220 years. A human can’t live that long, but robotic explorers could make the job easier. However, our fastest spacecraft don’t come anywhere near that one-tenth light-speed mark.
At present, scientists don’t know what the surface might be like on Gliese 581g. What they know is that the planet is at the sight distance from its star to have liquid water. It’s also at the right distance to have an atmosphere that could protect the water if it is on the surface.
Although spacecraft won’t be getting there anytime soon, one way to look for life on Gliese 581g is to turn our radio telescopes（望遠(yuǎn)鏡）towards the planet and search for radiation（放射）. By studying the radiation, scientists would find out about the chemicals（化學(xué)物質(zhì)）around the planet and discover it Gliese 581g has an atmosphere. If it has one, studying the atmosphere would give us a good idea if the planet has life or not. But it’ll probably be many years before we can do this properly.
People have been arguing about whether there is alien life on Gliese 581g. Any discussion about alien life is just guessing at this point, according to its discoverers.
小題1: What did scientists find in September 2010?
A．A planet with water. B．A planet similar to the earth.
C．A planet without life.D．A planet near the earth.
小題2:According to the article, Gliese 581g ________.
A．is at the right distance from its starB．moves around the earth
C．is as far away from us as the moonD．can be reached in about 220 years
小題3: Paragraph 5 is mainly about ______.
A．the possibility of living on Gliese 581g
B．the kinds of chemicals around Gliese 581g
C．the way of looking for life on Gliese 581g
D．the aim of studying the radiation on Gliese 581g
小題4:Which of the following is the best title for the passage above?
A．Gliese 581g, a Likely Living PlanetB．Gliese 581, a Likely Living Planet
C．Gliese 581g and Its StarD．Gliese 581g and Radiation

查看答案和解析>>

科目：初中英語 來源：不詳 題型：閱讀理解


MSG(monosodium glutamate) is a food additive(食品添加劑),which has been widely used by many food factories all over the world since it appeared first in Japan in 1909.
MSG is a substance that is added to some food to improve its original(原先的) taste and colour. It is used in foods around the world such as cakes, bread, frozen meats, fish and vegetables. In the beginning, people thought MSG was safe just like salt and sugar. However, in 1968 some people reported they seemed to have bad reactions(反應(yīng)) to MSG after having had a meal at a restaurant. They included headaches and quick heartbeat(心跳).It was also reported that MSG excited a person’s brain and caused his death in Japan. Scientists think that MSG may lead to many neurological disorders(神經(jīng)紊亂).In mice studies done by a university, the evidence showed the mice didn’t want to eat the food including MSG.
Today many food companies “hide” MSG on food labels(標(biāo)簽) by using different names. If you see “natural flavorings”,“hydrolyzed protein”and “spices” in a food label, you are probably seeing a hidden way to “report” MSG in a food label. Every time we have a meal in a restaurant, we always feel the food very delicious to taste, but sometimes it is dangerous for our health because some poisonous food additives have been added to the food.
To protect people’s health, our governments, from central to local, are taking actions to stop factories producing poisonous food additives.
小題1: Monosodium Glutamate is _______
A．a(chǎn) foodB．a(chǎn)n additiveC．a(chǎn) factoryD．a(chǎn) country
小題2:MSG is often used in ______.
A．frozen meatsB．cupsC．clothesD．book covers
小題3:The examples in the second paragraph tell us ________.
A．the food including MSG is deliciousB．people like to eat in a restaurant
C．mice like eating the food including MSGD．MSG is not safe sometimes
小題4:If you see “natural flavorings”,“hydrolyzed protein” and “spices” in a food label, you will know ­­­­­­­_____________.
A．you must eat the food in a hidden way
B．the food label must be hidden
C．MSG is probably added to the food
D．you must report the food to your parents
小題5:The underlined word “substance” in the article means __________.
A．colourB．materialC．tasteD．food

查看答案和解析>>

科目：初中英語 來源：不詳 題型：完形填空

Maybe you are more interested in sports than in history. You probably think you will never be a top student.    31   , anyone can become a better student if he or she wants to. If you can use your time well, you may  32 your study without much work. Here’s how:
  33  your time carefully. You should make a   34   of things that you have to do. First write down the time for eating, sleeping, dressing, etc. Then decide on a good time for studying. Of course, studying shouldn’t take all of your time. Don’t    35   to leave yourself enough time for hobbies.
Find a good place to study. Look around the house    36   a good study place. Keep this space. It may be a desk or just a corner of your room. N0     37   , radio, or television! When you sit down to work, think only about the     38   !
Make good use of your time  39  . Listen carefully to what the teacher says. Careful listening means   40   work after class. You also need to take notes, because it can make it easier for you to learn well.
These are only some of the ways to help you with your studying. I believe you’ll find more other ways besides these.
小題1:
A．In factB．For exampleC．At leastD．As usual
小題2:
A．a(chǎn)ffectB．findC．improveD．own
小題3:
A．TakeB．MakeC．PrepareD．Plan
小題4:A. change     B. choice        C list          D. wish
小題5:
A．wantB．forgetC．decideD．hope
小題6:
A．withB．inC．a(chǎn)tD．for
小題7:
A．booksB．pensC．gamesD．tapes
小題8:
A．subjectB．placeC．timeD．way
小題9:
A．a(chǎn)fter classB．in classC．a(chǎn)t homeD．a(chǎn)t school
小題10:
A．moreB．lessC．mostD．least

查看答案和解析>>

科目：初中英語 來源：不詳 題型：閱讀理解

What will the house of the future look like? Could it have gardens on its walls, or a pool with fish for dinner? Architects believe that they are all possibilities. The only thing for sure is that the houses will be as green as possible.
The tree house
Many architects in the world would like to build a “tree house.” Like a leaf, the surface of the house collects sunlight during the day. The energy can be used to heat water, produce electricity, and even create fresh air for the home. The “root” (根) of the house is deep under the ground. It uses the soil (土壤) to the home’s temperature.
The Lizard house
Like a lizard (蜥蜴), changing color with the weather is the most important design of a lizard house. When it’s in the bright sun, the cover of the house will turn dark to protect it from strong heat. During dark days, it turns white and takes in as much light and heat as possible to produce energy.
Meals at home
This design is perhaps as much about the future of food production as architecture (建筑風(fēng)格). It has gardens on the outside wall of the house. People can plant tomatoes, carrots and green tea on them. So every day in the morning, you just need to walk outside and collect your meals.
Learning from the past
Looking to the future isn’t the only way to be green. Sometimes, ancient techniques (古老的技術(shù)) can also help cut down energy use. For example, a chimney (煙囪) can be a useful air conditioner because it is easier of hot air to flow out at the chimney.
小題1:What is the best title (標(biāo)題) of the passage?
A. Green house of the future.
b. The greener, the better.
C. How to build green houses.
D. Changes of the houses.
小題2:We can heat water, produce electricity or create fresh air for the home            .
A. with the root of a leaf.
b. with the energy from sunlight.
C. with the soil under the ground
D. with gardens on its walls.
小題3:What will happen to the cover of the lizard house when it’s in the bright sun?
A. It will take in light.
b. It will produce energy.
C. It will turn dark.
D. It will turn white.
小題4:The passage seems to tell us that meals at home in the future            .
A. will be more delicious.
b. need more cooks.
C. cost as much as possible.
D. will be greener.
小題5:A chimney can be a useful air conditioner but it used to cause          .
A. pollution.   b. accident.     C. noise.      D. techniques.

查看答案和解析>>

同步練習(xí)冊答案