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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. Plans 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 celIs. 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.Where are genes?
A. Genes lining up on strands called chromosomes are in the center of cells.
B. Genes hide in everything alive in your body.
C. Genes can be nowhere but in your mind, controlling all your actions.
D. Genes travel in your body and help cope skin, muscle, and eyes.
4.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
5. We can conclude that ________.
A. scientists were less intelligent than monks in 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
高三英语阅读理解中等难度题查看答案及解析
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Have you ever heard a rumor spread around by students at your school? Rumors, like fake news, can often misinform individuals and lead them to believe false information.
In an attempt to settle this problem, the country of Singapore has passed a bill that bans companies and individuals from publishing false information online.
This law, known as The Protection From Online Falsehoods and Manipulation Bill, has caused a public outcry (强烈的抗议), as the government has been given the power to remove content that it considers inaccurate or against the public’s interest.
Since Singapore’s citizens are part of different racial and religious groups, the government fears that rumors or fake news can increase tensions within an already small country.
With the new law coming into effect, Singapore’s government now has the authority to monitor news sites, social media platforms, and other databases of information to determine whether the content is falsified. The government can order for the removal of fake news, and publishers of this information can receive prison time and fines up to one million Singapore dollars!
Critics fear that the bill threatens their freedom of speech and freedom of expression. Since national issues and world news are generally discussed on online platforms, many are concerned that this new bill will prevent individuals from talking freely and having healthy conversations.
Several companies, including Google, Facebook, and Twitter, have offices situated in Singapore, meaning that the new law will affect their company operations. Social media companies in Singapore could face a decline in activity, as users may fear posting their opinions and being punished by the government.
Others are concerned that the law does not clearly state what a “false statement” is. Such an ambiguity might allow the government to misuse their power, even though the intention is to curtail the mow of false information and rumors throughout Singapore.
This law does give rise to several concerns related to freedom and privacy and it will be interesting to see what Singapore’s government will do to deal with this problem.
1.Why are some people against the bill?
A.They think the bill can’t get rid of fake news.
B.They belong to different racial and religious groups.
C.They think their freedom of speech may be harmed.
D.They don’t want to increase tensions in their country.
2.What does the government have the right to do under the new law?
A.Punish publishers of fake news.
B.Monitor telephone conversations.
C.Prohibit certain people from going online.
D.Fine fake-news makers any amount of money.
3.How will the new law affect social media companies in Singapore?
A.Their users’ privacy may be disturbed.
B.Their income will increase very slowly.
C.Their illegal activities will come to light.
D.Their social media may become less active.
4.What does the underlined word in paragraph 8 probably mean?
A.prove B.accelerate
C.promote D.decrease
高三英语阅读理解困难题查看答案及解析
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Did you ever have a dream? I’m not talking about a dream you have when you sleep. I’m talking about a conscious ______where you would like to see a new future, a different choice of employment, and a_____ of you own. How many times have you wished that you could be living in a different______than the one you are_______ experiencing?
Several years ago, I had a dream about inventing a board game that would________my life's fortunes. After many revisions, a board game was developed. It was a(n)______ time. Our dream seemed to come true with sales starting to accumulate, and our company was also _________
____, another new board game________the market and made great progress in sales. Eventually, our company was dissolved.
Perhaps for a game developer, the______emotions that it never was meant to be will discourage his future dreams of a different life. But to me, maybe I didn't succeed to the level I________, at the very least I turned my dream________a reality. ________I had never transferred my dream into goal and then to action, there wouldn't have been _________lessons to be learned from the failure. It may take many________but success is only achieved. Once dreams are _______action, failure becomes a ______action plans in future. The important__________here is that success only comes by turning dreams into rea
lity and realizing that________are only stepping-stones to final success. After many attempts, many failures, many lessons and many false starts, learn valuable lessons from failure, tum dreams into________, and don't let a dream only be a dream, success will arrive at last.1.A. future B. life C. dream D. plan
2.A. factory B. farm C. car D. business
3.A. environment B. school C. family D. society
4.A. enjoyably B. previously C. constantly D. currently
5.A. destroy B. realize C. change D. create
6.A. exciting B. terrible C. dark D. embarrassing
7.A. canceled B. combined C. disappeared D. founded
8.A. Unfortunately B. Unlikely C. Unconsciously D. Unfairly
9.A. came into B. left out C. came back D. took in
10.A. optimistic B. negative C. difficult D. positive
11.A. needed B. devoted C. desired D. begged
12.A. by B. on C. over D. into
13.A. Unless B. If C. After D. Before
14.A. valuable B. successful C. useless D. cruel
15.A. analyses B. designs C. attempts D. revisions
16.A. took up B. look into C. run across D. put into
17.A. good B. better C. most D. bad
18.A. meaning B. point C. truth D. purpose
19.A. efforts B. achievements C. possibilities D. difficulties
20.A. heart B. existence C. action D. amb
ition高三英语完形填空中等难度题查看答案及解析
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Did you ever have a dream? I’m not talking about a dream you have when you sleep. I’m talking about a conscious ______where you would like to see a new future, a different choice of employment, and a_____ of you own. How many times have you wished that you could be living in a different______than the one you are_______ experiencing?
Several years ago, I had a dream about inventing a board game that would________my life's fortunes. After many revisions, a board game was developed. It was a(n)______ time. Our dream seemed to come true with sales starting to accumulate, and our company was also _________
____, another new board game________the market and made great progress in sales. Eventually, our company was dissolved.
Perhaps for a game developer, the______emotions that it never was meant to be will discourage his future dreams of a different life. But to me, maybe I didn't succeed to the level I________, at the very least I turned my dream________a reality. ________I had never transferred my dream into goal and then to action, there wouldn't have been _________lessons to be learned from the failure. It may take many________but success is only achieved. Once dreams are _______action, failure becomes a ______action plans in future. The important__________here is that success only comes by turning dreams into rea
lity and realizing that________are only stepping-stones to final success. After many attempts, many failures, many lessons and many false starts, learn valuable lessons from failure, tum dreams into________, and don't let a dream only be a dream, success will arrive at last.1.A. future B. life C. dream D. plan
2.A. factory B. farm C. car D. business
3.A. environment B. school C. family D. society
4.A. enjoyably B. previously C. constantly D. currently
5.A. destroy B. realize C. change D. create
6.A. exciting B. terrible C. dark D. embarrassing
7.A. canceled B. combined C. disappeared D. founded
8.A. Unfortunately B. Unlikely C. Unconsciously D. Unfairly
9.A. came into B. left out C. came back D. took in
10.A. optimistic B. negative C. difficult D. positive
11.A. needed B. devoted C. desired D. begged
12.A. by B. on C. over D. into
13.A. Unless B. If C. After D. Before
14.A. valuable B. successful C. useless D. cruel
15.A. analyses B. designs C. attempts D. revisions
16.A. took up B. look into C. run across D. put into
17.A. good B. better C. most D. bad
18.A. meaning B. point C. truth D. purpose
19.A. efforts B. achievements C. possibilities D. difficulties
20.A. heart B. existence C. action D. amb
ition高三英语完形填空中等难度题查看答案及解析
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---Hi, Lucy．Have you heard of any good news about Frank recently?
---Yeah．She ____ have done better．She has been admitted to one of the top-ten universities in the States．
A．shouldn’t B．wouldn’t C．needn’t D．couldn’t
高三英语单项填空中等难度题查看答案及解析
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---Hi, Lucy．Have you heard of any good news about Frank recently?
---Yeah．She ____ have done better．She has been admitted to one of the top-ten universities in the States．
A．shouldn’t
B．wouldn’t
C．needn’t
D．couldn’t
高三英语单项填空中等难度题查看答案及解析
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Have you ever heard about “cyberbullying”? This is a new kind of bullying. Teenage cyberbullies post lies and hateful things about other young people on the Internet in order to embarrass them and make them feel bad.
It is getting to be a serious problem, and it is spreading very fast. The victims don't want to go out or go to only school and avoid talking to everyone because they worry that people have already seen the lies on the Internet.
Teenagers bully other teenagers online, by sending insults or threats（侮辱或威胁）directly to them in emails or instant messages. Also, they spread hateful comments about a person through e-mail, instant messaging, or by posting on blogs or Web sites teenager often read.
A teenage student from Canada was physically bullied for years. Finally, people began to bully him online too, sending him hateful e-mails telling him no one liked him. He didn't know how to get away from the bullies, so he left school and isolated（隔离）himself from everyone.
Another example is when a group of middle school students bullied a teenage girl and started sending her unpleasant messages about her physical appearance. They called her names online and said many things to hurt her. She was very badly emotionally wounded.
Some parents, teachers, and other adults are trying to stop it by talking to victims they know about. If victims can talk about these problems with someone, they can find ways to deal with cyberbullying.
Parents of students need to check and see what their children are doing online. If they see their children bullying someone online, they need to help their children understand that they are seriously hurting their victims and see that it is wrong.
Recently I read that thousands of students and teachers in Michigan attended a conference about stopping bullying. They all worked together and discussed ways to stop bullying in their schools.
1.Cyber bullying is__________.
A. a kind of net cheat and jokes B. a way of telling lies merely
C. an online insult or threat D. a new method of grading
2.What can we learn about the two teenagers mentioned in Paragraphs 4 and 5?
A. They both suffered from online hateful insults.
B. They were both physically bullied for years.
C. They both had to leave school for a while.
D. They were both bullied by their classmates.
3.Cyberbullying can’t possibly arise_________.
A. so long as schools don’t give free access to the Internet
B. if teachers charge the students with adequate schoolwork
C. if cyber users raise their awareness of their respect for others
D. if parents are strict enough with their children in their online time.
4.Which of the following points is included in this passage?
A. Many effective ways have been performed to stop cyberbullying.
B. Some victims are both physically and emotionally insulted.
C. Most teenage cyberbullies have realized its seriousness.
D. Parents of the cyberbullies should be responsible for the bullying.
5.What can you learn from the passage?
A. Cyberbullying has been under control.
B. The influence of Cyberbullying is getting around fast.
C. Teenagers mean no harm by cyberbullying.
D. Victims are ready to turn to other people for help.
高三英语阅读理解困难题查看答案及解析
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—Have you heard any news about Sarah?
—Yes, she was promoted to president of her company, ________ surprised everyone.
A. who B. that C. which D. it
高三英语单项填空中等难度题查看答案及解析
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(2013·湖南高考)—Have you heard about the recent election?
—Sure, it ________ the only thing on the news for the last three days.
A．would be B．is C．has been D．will be
高三英语单项填空中等难度题查看答案及解析
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—Have you heard about the recent election?
—Sure, it ________ the only thing on the news for the last three days.
A．would be B．is C．has been D．will be
高三英语单项填空中等难度题查看答案及解析
lity and realizing that________are only stepping-stones to final success. After many attempts, many failures, many lessons and many false starts, learn valuable lessons from failure, tum dreams into________
ition