阅读理解Have you ever heard a news reporter talk about DNA?Reporters talk about DNA found at the scene of a crime.They talk about police finding DNA “fingerprints .Police sometimes use DNA as a clue to 题目和参考答案——青夏教育精英家教网—

题目内容

阅读理解

Have you ever heard a news reporter talk about DNA?Reporters talk about DNA found at the scene of a crime.They talk about police finding DNA “fingerprints”.Police sometimes use DNA as a clue to find out who committed the crime.

DNA is a substance(物质)that makes up genes.Everything alive has genes.Plants have genes.Animals have genes.You have genes.

Genes are the basic units of heredity(遗传).Heredity means all the characteristics you inherit from your parents.You get your genes from your parents.You inherit half of your genes from your mother.You inherit half of your genes from your father.

Genes are a kind of code.A tree’s genes tell what shape its leaves will be.A cat’s genes tell what color its fur will be.Your genes tell what color your eyes will be.Your genes tell what color your hair will be.Everything about you comes from the code in your genes.

Genes line up on strands(链)called chromosomes(染色体)in cells.Everything alive is made up of cells.Chromosomes are in the center,or nucleus of cells.

Different parts of you are made of different kinds of cells.Your muscles are made of muscle cells.Your skin is made of skin cells.The code in your genes tells your body to make different kinds of cells.The genes in each cell tell the cell how to work.They tell the cell when to make new copies of itself.

An Austrian monk named Gregor Mendel first saw inherited patterns in pea plants.He experimented with pea plants in the 1860s.One of the things,or traits(特质) Mendel studied was what makes some pea plants tall and some short.He said that the traits must come from units of heredity passed from the parent plants.These units were later called genes.

In the mid-1900s,scientists discovered that genes are made of DNA.In the 1970s,scientists learned how to change DNA with genetic engineering.Scientists also learned that problems with certain genes cause diseases.Muscular dystrophy,cystic fibrosis,and hemophilia are some genetic diseases—diseases caused by problems in genes.Today,scientists are looking for ways to cure genetic diseases by changing genes through a process called gene therapy.

1.What is DNA?

A.DNA is a kind of gene.

B.DNA is a substance that makes up genes.

C.DNA is the basic unit of heredity.

D.DNA is a measure to protect crime.

2.Which of the following about genes is correct according to the passage?

A.Plants,animals and human beings have the same genes.

B.Half people inherit all genes from their mother,others from their father.

C.Genes decide the trees shapes,the cats’ fur color and our eyes’ color as well.

D.Genes will give you a code when you need them.

3.An Austrian monk named Gregor Mendel .

A.first saw inherited patterns in people

B.was interested in why plants were different

C.first called the units of heredity from parents genes

D.was the first who discovered genes

4.We can conclude that .

A.scientists were less intelligent than monks in the 1900s

B.some genes are bad and can cause diseases

C.we don’t need to worry about genetic diseases any longer

D.the discovery of genes may be of great help in our daily life

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相关题目

完形填空

阅读下面短文，从短文后各题所给的四个选项（A、B、C和D）中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。

Mr. Glen is a millionaire. Five years ago, after returning from abroad to his motherland, he _________ up his small company. Speaking of success, Glen often tells us a story about his _________ expensive “school” fees. He always owes his success to it.

At that time, Glen, who already got a Ph. Degree, decided to return to the homeland, starting a company. Before _________, he bought a Rolex watch with the _________ made through years of work after school and the scholarships. At the airport he had to accept the routine customs check. The watch on his wrist was also demanded to be _________ down for inspection. Glen knew that carrying the _________ goods out had to pay the tax. And he worried about paying _________ for his watch. So when he was checked, he told a lie that his watch was a _________ fake(假货). When he was _________ of his “smarts” immediately, _________ the presence of Glen, the officers hit the watch, which _________ nearly ￥100,000, into pieces at hearing Glen's words. Glen was amazed. _________ he understood why, he was taken to the office to be _________ strictly. For many times of entry?exit _________ he knew that only those people in the “blacklist” would “enjoy” this special treatment. The officers looked out every thing carefully in the box, and warned him _________ time of entry and exit he must accept the check and if _________ reusing and carrying fake and shoddy (劣质的) goods, he would be charged according to law! Suddenly, his face turned red, and he had nothing in mind after _________ the plane for long.

After returning to the homeland, he often told the story to his family, and his employees, too. He said that this made a deep _________ on him, because an additional high “school” fee that he had ever paid made him realize the value of _________ , which he would _________ as the secret of his success forever.

1.A. came B. set C. went D. called

2.A. good B. bad C. extra D. few

3.A. leaving B. staying C. living D. coming

4.A. books B. things C. savings D. pounds

5.A. put B. looked C. lied D. taken

6.A. specific B. common C. ordinary D. many

7.A. one B. them C. it D. these

8.A. priceless B. valuable C. worthless D. wonderful

9.A. afraid B. hard C. well D. proud

10.A. on B. in C. before D. after

11.A. paid B. spent C. took D. cost

12.A. Before B. After C. If D. Though

13.A. checked B. beaten C. examined D. spoken

14.A. conditions B. experiences C. experiments D. chances

15.A. no matter what B. no matter how

C. no matter when D. no matter why

16.A. came out B. found out C. sent out D. set out

17.A. landing B. flying C. boarding D. catching

18.A. expression B. idea C. thought D. impression

19.A. honesty B. lies C. goods D. things

20.A. learn B. remember C. revise D. read

While waiting for the opportunity to get , Henry did his best to perform his duty.

A. promote B. promoted

C. promoting D. to promote

Without my parents’ encouragement and support, I definitely ______ where I am today.

A. wasn’t B. hadn’t been

C. wouldn’t be D. wouldn’t have been

阅读理解。

The Hunan Satellite TV(HNTV) show Where are we going,Dad? is a big hit.Many famous stars brought their children to a strange village alone,and they had to spend 72 hours with their children there.The program fully showed us a modern version of the “how to be a good father”.As the young parents today are too busy to take care of their children,this new form of “Lost on the way” played by nanny(保姆式的) daddy and cute kids triggered(触发)a lot of people’s emotional resonance(共鸣).Both the kids and their parents will find that their hearts are being drawn closer.But this kind of feeling has just proved that there is a big spiritual barrier between the modern parents and children.

The TV shows like Children are hard to support!,Where are we going,Dad?,Hot Mom and Cute Kids are becoming more and more popular.All of these show the new parents’ confusion in children’s education and the appeal for the balance between career and family.

In real life,on the one hand,the young parents feel helpless because they are too busy to accompany their children under the pressures of work and life;on the other hand,they continue to do so.The data collected by HNTV show that nearly two-thirds of their audience are female,among whom 36% are aged from 25 to 34.We can imagine such a scene that one evening a young mother is watching the show with her young children,while her husband is still at work or trapped in socializing,or maybe is just playing computer games in the bedroom.The story of a child without the company of father is still going on.In fact,it is sometimes the same to mothers.In a modern family,it is often the old who take the responsibility for raising a child.The participation of mother in the children’s education is also very low.

It is just this kind of confusion where the parents have gone in the modern family education,and where the parents will guide their children to go that Where are we going,Dad?shows us.If a child wants to grow up healthily and safely with independent personality and free spirit,it is very important for him or her to follow the parents who serve as their first teacher.Maybe this is the real reason why such kind of TV programs could get hot.The truth is that children will go where their parents go,and society will go where the children go.

1.Which of the following can be inferred from the passage?

A.Parents shouldn’t entirely leave the education of children to the old.

B.36% of the audience of the program are female aged from 25-34.

C.The program shows us the confusion where the parents and children will go to play.

D.In a modern family it is often mothers who are responsible for raising a child.

2.In raising a child in modern society,parents should .

A.play computer games with their children

B.break down the barrier between children and teachers

C.balance well between family and career

D.keep their children at home to avoid socializing

3.What attitude towards modern family education does the author express in the passage?

A.Optimistic. B.Proud.

C.Negative. D.Worried.

4.Which one is the best title of the passage?

A.Confusion behind Where are we going,Dad?

B.Modern Education is Important

C.Nanny Daddy and Cute Kids

D.New Problems in Modern Children’s Education

阅读下列短文,从每题所给的四个选项(A、B、C和D)中,选出最佳选项。

Energy goes from one plant or animal to another.A food chain shows how this energy moves.Each time an animal gets eaten,its energy is passed onto the animal that eats it.The food chain is very important because it keeps the balance of nature.If one part of the food chain disappears,it can affect all the other plants and animals.Any threat to the food chain is a threat to the environment’s biodiversity(生物多样性).The food chain helps keep animal populations in balance.However,if something happens to damage one of the links in the food chain,that balance is broken.If one animal becomes endangered,it puts all the animals above it at risk.

Some of the threats are natural,such as wildfires,hurricanes,tornados,floods and so on.But the biggest threats to the food chain come from you and me.These threats include overfishing,logging,farming,development,pollution,etc.The food chain is endangered anywhere humans have had an effect on the natural environment.

A recent study shows that the overfishing of large sharks is damaging the food chain along the US Atlantic coast.Canadian and American scientists say sharks are being killed in great numbers for their meat and fins(鳍).Now,not enough sharks are around to eat the cownose ray.The ray’s population has increased and they have eaten up the shellfish to the point where it has hurt commercial(商业的) fishing.

Many of us disturb the natural environment in our own backyards.It’s up to us to take care of the environment and try not to disrupt the natural food chain.If we don’t act responsibly,animals will start disappearing.

1.What can we learn from Paragraph 1?

A.The food chain is not easy to be broken.

B.The energy of an animal usually disappears when it dies.

C.Increasing the links will not break the balance of nature.

D.Breaking the food chain is bad for the biodiversity of the environment.

2.The study mentioned in Paragraph 3 proves that .

A.human activities can be a big threat to the food chain

B.we are all responsible for the breaking of the food chain

C.natural disasters are hard to break the food chain

D.hunting large sharks for meat is beneficial

3.We can infer that the writer wrote this passage mainly to .

A.explain what the food chain is

B.tell us something interesting about nature

C.suggest that we stop eating meat to save animals

D.suggest that we should not disrupt the natural food chain

The television program is designed to educate and not m to entertain.

The teacher paused as if ______ his students to ask questions on the point he had just said.

A. expecting B. to expect

C. having expected D. to have expected

Most of the students in the Occupy Central movement in Hong Kong ______ have participated for more rights, but what they did caused serious effects on people’s living.

A. should B. might

C. would D. Can

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