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(wàn)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

小題1:A
小題1:A
小題1:C
小題1:A
【主旨大意】科學(xué)家在2010年9月發(fā)現(xiàn)了一個(gè)帶有生命跡象的球體，然后介紹了它與地球的距離以及尋找生命的方法。
小題1:細(xì)節(jié)理解。第一段第一句：科學(xué)家發(fā)現(xiàn)了一顆存在生命的行星。
小題1:細(xì)節(jié)考查。從第四段可知：the planet is at the right distance from its star.
小題1:整體理解。本段主要介紹尋找Gliese 581g上面生命的方法。
小題1:整體理解。Gliese 581g是一個(gè)充滿生命的球體。
練習(xí)冊(cè)系列答案
相關(guān)習(xí)題

科目：初中英語(yǔ) 來(lái)源：不詳 題型：完形填空

If you often have a cold, headache or backache, there is something wrong with your health. Eating healthy food 1  good for our health. .Tofu（豆腐）, milk, vegetables are healthy for us.
Tofu is a kind of traditional（傳統(tǒng)的）   2  food. We often   3  it in China. Now more and more people   4  other countries think tofu is good for health,  5 . They also like eating it.
Milk is   6  kind of health food. Every day you should   7  one or two glasses of milk. It can   8  us strong.
Vegetables are very important. You should eat   9  them. There are vitamin(維他命) A, B, C, D , E and so on in them.
As we know, it’s important   10  a balanced diet(均衡飲食). We must have the right kinds of food. We should also eat some pork, chicken and beef. We should eat more fruit and vegetables but less meat.
(       )1 A are       B is         C will be    D was
(       )2 A Japanese  B American  C English   D Chinese
(       )3 A eat       B drink      C take     D play
(       )4 A for       B with       C in       D at
(       )5 A too       B also       C well   D either
(       )6 A the other  B other      C another  D others
(       )7 A drinking   B drink     C take     D to take
(       )8 A keep      B make    C keeps    D keeping
(       )9 A a lot       B plenty    C much    D  lots of
(       )10 A making   B to keep    C keeping   D to drink

查看答案和解析>>

科目：初中英語(yǔ) 來(lái)源：不詳 題型：閱讀理解

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（聰明的） 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（數(shù)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（性別）. As white matter is the key to spatial（空間的）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（胎兒）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.
小題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.
小題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.
小題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.
小題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：初中英語(yǔ) 來(lái)源：不詳 題型：閱讀理解

How to Become Fit?
Healthy eating habit along with regular exercise is the only way to become fit. If you have the correct number of calories and exercise regularly, you will lose weight, keep fit, and feel great, too.
During your teenage years, it is important to give your body the energy it needs. If you skip (跳過(guò)) meals, you won’t get enough calories, and then you will feel tired. By the way, calorie is just another word for energy. About 50% of your calories should come from rice, bread, vegetables and fruit. You also need to drink a lot of water, 6 to 8 glasses a day. Water helps keep your system clean. Drinking enough water will make your skin better and make you healthy.
Exercise is something that can help to make you look good, feel good and be healthy. Experts suggest that teenagers spend at least 30 minutes exercising, five times a week. That is easy to do! You can walk or ride your bike to school, and do sports at school. However, teenagers often give up sports, saying they have no time left after their studies. In fact, doing exercise can help them sleep better at night and increase their ability to focus on their study.
If you follow the suggestions above, you will look and feel much better and become fit.
小題1: What’s the main idea of this passage?
A．How to eat food. B．How to exercise.
C．How to lose weight.D．How to keep fit.
小題2:The underlined word “calories” means ________ in this passage.
A．營(yíng)養(yǎng)B．能量C．強(qiáng)壯D．鍛煉
小題3:Teenagers spend at least _______ minutes exercising a week according to this passage.
A．150B．50C．30D．5
小題4: If you ________, you will become fit.
A．exercise regularly
B．drink lots of water
C．eat rice, bread, vegetables and fruit
D．have a healthy eating habit along with regular exercise
小題5:Why do teenagers give up sports in school according to this passage?
Because they _________.
A．a(chǎn)re lazy B．feel great
C．a(chǎn)re busy with their studies D．don’t like sports

查看答案和解析>>

科目：初中英語(yǔ) 來(lái)源：不詳 題型：閱讀理解

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.

查看答案和解析>>

科目：初中英語(yǔ) 來(lái)源：不詳 題型：完形填空

Who taught you to walk when you were little? Who worries the most when you are   56 ? Who makes you dinner? It’s your   57  . No matter what happens, she’ll   58  the love for you.
Do you know how did   59    Day come into being(產(chǎn)生) ? It began in the US in 1907 whenan    60   girl named Anna Jarvis started a campaign to honor(給......以榮譽(yù)) mothers. Shebelieved that mothers could   61  people to get over the   62  of the War and to strengthen (加長(zhǎng)) the relationship inside families.
On Mother’s day, children usually help their mothers do    63  . In western countries, bringing mothers  64  in bed is common. A mother will get up late while her children make her favorite breakfast. Children also make their own Mother’s Day card    65  a thank-you note. Or they buy gifts and flowers for their mothers.
小題1: A. lazy B. ill C. sleepy
小題2:A. father B. mother C. sister
小題3: A. continue B. stop C. start
小題4:A. Children’s B. Women’s C. Mother’s
小題5: A. Asian B. Australian C. American
小題6:A. help B. ask C. order
小題7:A. worry B. pain C. memory
小題8: A. homework B. housework C. hair
小題9: A. flowers B. clothes C. breakfast
小題10: A. with B. for C. from

查看答案和解析>>

科目：初中英語(yǔ) 來(lái)源：不詳 題型：閱讀理解

Children arc children after all, and most of them speak their mind. When they are just toddlers(幼兒), they are all lovely and lively. And it's so interesting to watch them speak like a grown-up. But as they grow, these same kids seem annoying and ill-mannered if they try to be a grown-up.
Conflicts(矛盾）go between parents and children. It's hard to tell who are right and who are wrong. A child of 7-8 always finds some reasons to have a conflict with it's parents. Whether it is about some toy, studies, a party or a company, there is always a difference between them. And it becomes worse when they answer you back. Scientists tell us that children should be treated with care. Yes, sure they should respect their elders.
We are partly responsible(有責(zé)任的）for this. At an early age we encourage children to behave like adults, just because we find it funny. The kids on the other hand consider this same behavior as normal and get used to it. And when it is not funny for us any more, we expect them to stop it, but by then it is already too late. Only when they reach a certain maturity will the children realize that answering back and being rude are not acceptable(可接受的).Until then, most of the time their behavior is difficult to change, unless by force(暴力）.And use of force is against the every good idea, as it weakens the child's confidence.
So it is one thing to bring a child into this world but quite another to make them into well mannered citizens. The best way is to be a good example ourselves, as our children are the mirrors of us adults.
小題1:_______are all lovely and lively.
A．Children B．ToddlersC．KidsD．Grown-ups
小題2:There are many conflicts between   ______.
A．fathers and mothersB．parents and children
C．parents and toddlers D．parents and parents
小題3:The underlined word "maturity" means________.
A．學(xué)期B．階梯C．知識(shí)D．成熟
小題4:Which is acceptable according to the passage?
A．Answering back .B．Being rude.
C．Using force. D．Respecting elders.
小題5:Which of the following is true?
A．Children often copy what their parents do.
B．Children can not change their behavior.
C．Children's behavior develops in their own way.
D．Children's behavior is not acceptable.
小題6:The writer wrote the passage__________.
A．to show the importance of good examples
B．to give examples on educating children
C．to show the growth of children
D．to show the behavior of children

查看答案和解析>>

科目：初中英語(yǔ) 來(lái)源：不詳 題型：閱讀理解

Do you play a musical instrument? If so, you may be getting smarter. A recent study shows that taking music lessons can raise a person’s IQ.
Scientists studied 132 children in Canadian schools. At the beginning of the school year, these children took an IQ test. Then they were divided into four groups. One group took singing lessons. Another group took weekly piano lessons. The third group took classes in drams(戲劇). And the last group did no special activities at all.
At the end of the school year, the 132 children took an IQ test again. In all four groups, the average score went up. However, the piano players’IQs went up 7.0 points on average. The average increase for the other three groups was only 4.3 points.
The researchers say that the difference is small and it may not result in better grades for the piano players. However, they still consider the results important. Learning an instrument helps kids becomes better at concentrating and at memorizing things. Therefore, the researchers say, it may be good for brain development in young people.
If you have a chance to learn to play a musical instrument, never miss it. Remember it can make you smarter.
小題1: Which of the following is NOT true of the study?
A．It was done in Canada.
B．It was done by some musicians.
C．It included four groups of children.
D．It took one school year to complete.
小題2: Which of the following is true?
A．Average IQ scores increased in all the groups.
B．Only the piano players’ IQs increased.
C．The average increase for all four groups was 4.3 points.
D．Most of the children’s IQs did not go up.
小題3: The underlined word “they” in the passage refers to ______.
A． better gradesB．piano playersC．researchersD．instruments
小題4: What’s the main idea of the passage?
A．It’s good for us to listen to music.
B．Everyone should learn to play the piano.
C．Take an IQ test before you learn instruments.
D．Learning instruments may make kids smarter.

查看答案和解析>>

科目：初中英語(yǔ) 來(lái)源：不詳 題型：閱讀理解

A good way to pass an exam is to work hard every day in a year. You may fail in an exam, if you are lazy for most of the year and then work hard only a few days before the exam. If you are free, read stories in English. Speak English whenever you can. A few days before the exam you should go to bed early. Do not go to bed late at night studying. Before you start the exam, read carefully over the question paper, try to understand the meaning of each question. When you have at last finished your exam, read over your answers. Correct（更正）the mistakes if there are any and be sure that you have not missed anything out.
小題1:A good way to pass an exam is to ______ every day in a year.
A. go to bed early  B. work hard       C. read stories
小題2:If you work hard only a few days before the exam, you may _____the exam.
A. win              B. pass                  C. fail
小題3:A few days before the exam you should ______.
A. go to bed late       B. go to bed early     C. not go to to bed
小題4:When you have finished your paper, you should ______.
A. hand it in at once
B. read over your answers
C. try to understand the meaning of each question
小題5:The best title for this passage is __________.
A. An Important Exam
B. How to Pass an Exam
C. Get Ready for an Exam

查看答案和解析>>

同步練習(xí)冊(cè)答案