Prevent Viruses From Infecting Your ComputerT...

Prevent Viruses From Infecting Your Computer

The number one way to prevent viruses from infecting your computer is to have an anti﹣virus software on your computer, which can detect and block viruses before they have a chance to cause any harm. 1. If it finds any viruses, it can separate them and delete them safely from your computer. Because there are new viruses that are created on an almost daily basis, your virus protection needs to be updated regularly.

2. This way if your computer should ever get hit by a virus, which corrupts some of your system. you will have a back up copy available. 3. This will allow you to restart your computer using an earlier configuration （配置）before you got infected by the virus. This method is not always reliable but it is something that you can try.

An important rule of thumb is do not open attachments in emails from people you do not know. You have no idea what those attachments might contain and no idea who sent them. You should also be careful about opening attachments from people you do know if you are not sure what the attachment is about. 4.

Downloading is a good way to catch a computer virus. It's like opening the door and saying "Come on in! " Yes, if your virus protection is updated, it will hopefully catch the virus. 5. When downloading, make sure the site you are downloading from is reliable with a lot of traffic. Stay away from unreliable sites that have few visitors.

A.Not all viruses act immediately.

B.But then again, it might not.

C.Operating without a firewall is risky anyway.

D.Attachments are a good way for viruses to sneak into your systems.

E.A good anti﹣virus program can scan any program, files, or documents.

F.Another good way is to make backup copies of important documents and files.

G.You can even set a system restore point anywhere from a week or a month earlier.

高三英语七选五简单题查看答案及解析

Today, the biggest killers stem as much from our lifestyles as from bacteria and viruses.  One of the worst of these is heart disease, and specifically high blood pressure. It’s a slow, but efficient killer that robs many people of what should be the last 10, 20 or 30 years of their lives.

Scientists are claiming that they have now separated unusual ingredients in a rare seaweed discovered by fishermen off the coast of Korea that offer incredible health benefits—including the ability to restore blood pressure to normal levels.

Dr. Haengwoo Lee, a famous biochemist conducted a clinical study on these two ingredients. The first is Seanol, an extremely rare seaweed extract(浓缩物) from Ecklonia Cava that's proven to be 100 times more powerful than any land-based antioxidant(抗氧化剂). That's because it stays working in your body for 12 hours, compared to land-based antioxidants that work for 30 minutes.  "Its secret is its make-up of special chemicals that are a huge 40% fat soluble( 可溶的)," Dr. Lee explains. "Unlike nearly all land-based antioxidants that are water soluble, Seanol's protective compounds can get into things like the fatty tissues of your brain and penetrate（渗透） all three layers of your cells, including the outside, the oil-based cell membranes（细胞膜）, and your DNA."　Indeed, Seanol is so powerful, it's the only FDA-approved Ecklonia Cava marine-algae (海藻)  extract in existence.

The second ingredient is Calamarine, a deep-sea omega-3 discovery that delivers 85% more DHA omega-3s to your heart, brain, joints, and eyes. It's known to reduce the problems from tiredness and poor memory, joint pain, mood swings and depression.

With that research in mind, Dr. Lee combined Seanol and Calamarine with a high dose of vitamin D to form  Marine-D3, the newest supplement in the fight against age-related illnesses and high blood pressure.

Dr. Lee found that Calamarine delivers some of the greatest concentration of omega-3s known to science. Combined with Seanol's ability to reduce body inflammation(炎症), as well as help cells get the nutrients they need to thrive, stay healthy and protected, Marine-D3 is able to boost a body's entire well being.

The makers of Marine-D3 are so confident that you'll see fast dramatic results from this product, that if you aren't happy after two full months, simply return the unused portion and they'll buy it back. They'll even give you ten dollars extra just for giving it an honest try! That kind of faith, combined with Dr. Lee's exhaustive research, shows that Marine-D3 really is a one-of-a-kind product.

1.From the first paragraph we can infer that ________.

A. Our lifestyles result from the biggest killers

B. our lifestyles do less harm to our bodies than bacteria and viruses do.

C. High blood pressure left untreated may cause shorter life.

D. Heart disease is incurable.

2.What can we know from paragraph 2 ?

A. Fishermen off the coast of Korea have isolated unusual ingredients.

B. Scientists have purified ingredients that can lower blood pressure to normal standard.

C. Scientists discovered a rare seaweed.

D. Scientists have imagined a medicine that treat blood pressure.

3.Which is right about Seanol ?

A. According to FDA , Seanol reaches the agreed standard.

B. Seanol can be fat soluble entirely.

C. Seanol is a common seaweed extract from Ecklonia Cava .

D. Seanol's protective compounds can get into all things like the fatty tissues of your brain.

4.What do we know about Calamarine?

A. Calamarine is easy to find in the surface of the sea.

B. Calamarine 's ability to reduce body inflammation(炎症) alone.

C. Calamarine has a low dose of vitamin D and C.

D. Calamarine may relieve you if you feel blue.

5.What’s the makers’ attitude toward Marine-D3？

A. pessimistic        B. indifferent        C. doubtful         D. Optimistic

高三英语阅读理解中等难度题查看答案及解析

Su Hua is studying at Cambridge, UK. She has bought a bicycle and is worried about security.

Her friend, Kate, found this article and sent it to her.

Introduction

A lot of crime is against bicycles. About 150, 000 bicycles are stolen every year and most are never found. You can prevent this happening by following a few careful steps.

Basic Security

Do not leave your bicycle in out-of-the-way places. Always lock your bicycle when you leave. Secure it to lampposts or trees. Take off smaller parts and take them with you, for example lights and saddles (车座).

Locks

Get a good lock. There are many different types in the shops. Buy one that has been tested against attack. Ask for a recommendation from a bike shop.

Marking

Security making your bike can act as a deterrent to a thief. It can also help the police find your bicycle. It should be clearly written and include your postcode and your house or flat number. This will provide a simple way to identify your bicycle.

Registration

There are a number of companies who will security mark your bicycle for you. They will then put your registration number and personal details on their computer database. Then if your bicycle is found it will be easy to contact you.

Finally

Keep a record of the bicycle yourself: its make, model and registration number. You can even take a photograph of it. This will prove the bicycle belongs to you.

1.Which part of the text gives you information on how to lock up your bicycle when you leave it?

A.Locks. B.Marking. C.Registration. D.Basic Security.

2.The article advises you to keep a record of your bicycle　　　　 .

A.in the bike shop and your computer. B.in a police station and a security company.

C.in a security company and your university. D.by yourself and in a security company.

3.The main purpose of this article is　　　　 .

A.to tell you what to do if your bicycle is stolen.

B.to suggest ways of keeping your bicycle safe.

C.to give you advice on where to buy a good lock.

D.to say why you shouldn't keep your bicycle in a quiet place.

高三英语阅读选择中等难度题查看答案及解析

The flu season arrives so predictably, and affects so many of us, that it’s hard to believe that scientists have had very little idea why cold weather helps germs to spread.

Worldwide, up to five million people catch the illness each flu season, and around a quarter of a million die from it. Part of its power comes from the fact that the virus changes so quickly that the body is hardly prepared. “The antibodies we’ve built up no longer recognize the virus – so we lose our immunity,” says Jane Metz at the University of Bristol. It also makes it harder to develop effective vaccines, and even if one comes out, governments often fail to persuade enough people to take it up.

The hope is that by understanding better why flu spreads in winter, but naturally fades in summer, doctors could find simple measures to stop its spread.

Previous theories had centred on our behaviour. We spend more time indoors in the winter, meaning that we’re in closer contact with other people who may be carrying germs.

Another popular idea concerned our physiology(生理机制): the cold weather weakens your body’s defenses against infection. In winter, without much sunlight, we may run low on Vitamin D, which helps power the body’s immune system. Moreover, when we breathe in cold air, the blood vessels in our nose shrink, which affects the normal function of white blood cells, allowing viruses to slip past our defenses unnoticed.

While such factors both play some role, analyses suggested another ignored cause may have been lying invisible in the air that we breathe. Thanks to the laws of thermodynamics(空气热力学), cold air can carry less water vapor before it reaches the “dew point” and falls as rain. So while the weather outside may seem wetter, the air itself is drier as it loses the moisture. And researches in the past few years has shown that these dry conditions seem to offer the perfect environment for the flu virus to flourish.

In wetter air, the epidemic struggles to build strength, while in drier conditions it spreads like wildfire. And comparing 30 years’ climate records with health records, Jeffrey Shaman at Columbia University found that flu epidemics almost always followed a drop in air humidity.

1.What can we infer from the second paragraph ?

A.We lose immunity due to the absence of our antibodies.

B.The antibodies fail to function due to variation of virus.

C.Government should come up with better ways to persuade people.

D.One in four of the infected die from the influenza each flu season.

2.What is the purpose of understanding better why flu spreads in winter?

A.To help develop effective vaccine.

B.To seek ways to treat people infected with flu.

C.To figure out ways to cut off its transmission.

D.To explore how to defend our immune system.

3.In what weather condition a flu epidemic is more likely to occur ?

A.Destroying bodies’ immune system.

B.Powering our bodies’ immune system.

C.Killing numerous viruses that we take in.

D.Stopping us acquiring enough Vitamin D.

4.What is the best title of the passage?

A.Ways to prevent infection of flu B.Flu-A disease not so hard to prevent

C.A predictable flu season D.Why germs spread in winter

高三英语阅读选择简单题查看答案及解析

One way to prevent anxiety from getting out of control is to recognize its benefits. It is a mistake to think that we'd make better decisions if only we keep our feelings under control. Instead, a mix of feelings like anxiety and logical(合逻辑的) thinking leads to sound decision- making. It's true that there is plenty of research showing that higher levels of anxiety can make us more likely to avoid risks in our decision-making. There is also evidence that anxiety can increase the attention you pay to relevant information.

Recent studies have shown that people who are anxious about their relationship (for example, they fear to be abandoned) tend to be better at recognizing people who tell lies and are more likely to raise the alarm when danger is present.

In the real world though, it's worth realizing that feeling anxious once in a while is extremely common. It communicates to others that you care, and what's more, it's probably a sign that you are intelligent. At least two published studies have identified that people who score higher on measures of anxiety also tend to perform better on intelligence tests. This seems reasonable: if you're a thinker, you are sure to be always thinking about the future and imagine possible plots, including bad ones.

The important thing, if you are a worrywart (杞人忧天者) , is not to let your fear destroy your dreams. And don't bury your head in the sand. Instead, act on your fears — do the research as well as preparation, so rather than walking blindly into that which you fear, you meet the challenge in full readiness.

When anxiety beats you, or casts a shadow over your life, this is a serious problem. No one is denying that. But like everyday anxiety of this kind that you feel before a presentation or interview, you needn't see it as your enemy. Anxiety is an important feeling, developed through evolution. As for people who are fairly anxious by nature, there is reason for cheer, too. Your nerves (神经紧张) are a sign of your watchfulness. Listen to them and act on them. Then you can turn your nervousness into your advantage.

1.What can we infer from the first paragraph about anxiety?

A.It can enable us to be more focused.

B.It can stop us from thinking logically.

C.It can make us more willing to take risks.

D.It can be the only reason for all bad decisions.

2.What can we learn from the passage?

A.Anxious people are less sensitive to danger.

B.Anxious people have difficulty discovering liars.

C.Feeling anxious is more likely to put people at risk.

D.Feeling anxious occasionally is a sign of intelligence.

3.How should we deal with anxiety in the author's opinion?

A.Regard it as our enemy. B.Take action to control it.

C.Avoid being defeated by it. D.Treat it as a minor feeling.

4.What is the theme of the passage?

A.Effective ways to prevent anxiety. B.Unexpected benefits of anxiety.

C.Tips on how to keep a good mood. D.Common misunderstandings about anxiety.

高三英语阅读理解中等难度题查看答案及解析

A lack of self-respect can prevent you from fulfilling your potential and developing healthy relationships. Here are some steps to help you know how to respect yourself.

1.__________　 The　 qualities　 that　 we　 respect　 vary　 from　 person　 to　 person,　 and　 the　 way　 we express it varies from culture to culture. Generally, we respect people who have more experience and are more accomplished　 than ourselves. But　 there　 is　 also a basic　 level of　 respect　 that most people will　 agree　 is　 a　 right,　 and　 does　 not　 need　 to be　 earned. So　 think　 about what　 it means　 to respect others. Here are some widely agreed-upon signals of respect: You don’t steal from, harm, or　 insult　 them; you are honest with　 them; you　 listen　 to what　 they say, consider　 their opinions, and avoid interrupting them.

2.__________ We　 often　 do　 things　 for　 ourselves　 that　 we　 would　 never　 dream　 of　 doing　 for someone we care about. Whatever you believe to be respectful, apply it to yourself. Don’t harm yourself. Don’t insult yourself. Don’t steal from yourself. Be honest with yourself. Develop your own opinions and don’t be afraid to stand by them.

3.__________ A person with self-respect doesn’t allow others to treat them badly, and would rather not be around someone who is disrespectful. This might seem obvious, but there are many times when we accept being　 treated badly. When someone doesn’t give you basic　 respect, you need to be able to say, in one way or another, “You just disrespected me and that’s not acceptable!

If you don’t respect me, I won’t spend time with you any more.” Can you say that, and mean it?

Can you turn your back on someone who’s clearly shown that they don’t respect you? Once you do, you’ll feel your sense of self-respect go up.

4.__________ When you make an effort to keep your body in good working order, you’ll not only feel better physically, but also　 feel a sense of pride. Respecting your body also means not insulting it for what it is, naturally. Make an effort to get fit and stay healthy. Focus on the things you can change and improve, and do them because it feels good.

5.__________ The more　 you　 know　 about　 yourself,　 the more　 you’ll　 see　 and　 appreciate　 how unique you　 really are. And you’ll　 respect yourself more. Discover your principles, personality, and　 talents. Stop waiting　 for other people’s approval and start developing your own standards. Develop a unique and original way of expressing your opinions while at the same time being a good listener.

A. Get to know yourself.

B. Take care of your body.

C. Practice basic respect towards yourself.

D. Be honest with yourself and with others.

E. Think about what it means to respect someone.

F. Recognize when people disrespect you and take steps to stop it.

高三英语信息匹配中等难度题查看答案及解析

According to some doctors, one of the ways to prevent us from growing old is to make sure that our brains get enough___.

A. performance     B. exercise       C. experience    D. sport

高三英语单项填空简单题查看答案及解析

Wearing dark glasses can _______ your eyes from the sun.

高三英语单项填空简单题查看答案及解析

Scientists may one day be able to destroy viruses in the same way that opera singers break wine glasses. New research mathematically determined the frequencies at which simple viruses could be shaken to death.

The capsid (壳) of a virus is something like the shell of a turtle, said physicist Otto Sankey of Arizona State University. “If the shell can be damaged by mechanical vibrations (震动), the virus can be destroyed.”

Recent experimental evidence has shown that laser (激光) pulses with the right frequency can kill certain viruses. However, locating these resonant (共振的) frequencies is a bit of trial and error. Experiments must try various conditions, Sankey said.

To further this search, Sankey and his student Eric Dykeman have developed a way to calculate the vibrations of every atom in a virus shell. From this, they can determine the lowest resonant frequencies. An experiment has recently shown that pulses of laser light can cause destructive vibrations in virus shells. Sankey said, “Like pushing a child on a swing from rest, one sudden push gets the virus shaking.”

However, it is difficult to calculate what sort of push will kill a virus, since there can be millions of atoms in its shell structure. A direct calculation of each atom’s movements would take several hundred thousand Gigabytes of computer memory, Sankey explained.

The team plans to use their technique to study other, more complicated viruses. However, it is still a long way from using this to destroy the viruses in infected people. “This is such a new field, and there are so few experiments that the science has not yet had enough time to prove itself,” Sankey said. “We remain hopeful but remain skeptical at the same time.”

1.What is the new way to kill viruses?

A.Replacing viruses’ capsids with shells.

B.Breaking viruses’ capsids by vibration.

C.Locating the position of certain viruses.

D.Damaging the conditions that viruses like.

2.Why does Sankey mention “pushing a child on a swing” in Paragraph 4?

A.To prove how simple the new theory is.

B.To explain how to start the virus shaking.

C.To suggest the idea comes from our real life.

D.To show the destructive power of vibrations.

3.What is the fifth paragraph mainly about?

A.The shell structure of viruses.

B.The lack of computer memory.

C.The challenging part of the research.

D.The importance of atoms’ movement.

4.What is Sankey’s attitude towards the theory?

A.Disapproving. B.Worried.

C.Uncaring. D.Positive.

高三英语阅读选择困难题查看答案及解析

If your fingers get chilly all year round—even in the peak of summer—you’re not alone. Many people get cold hands during all of the seasons, due to a number of causes, from genetic to chronic illnesses.

Common reasons include being elderly and thin. If your hands are regularly cold or numb, however, it’s a good idea to see a doctor to rule out more serious causes. Cold hands are one of the symptoms of both anemia (贫血症) and hypothyroidism (甲状腺机能减退). Diabetes, which reduces blood circulation, can also trigger it. And if your heart is weak from heart disease, your body may prioritize sending blood to your core over your limbs.

For many others, cold hands are a sign they have a largely harmless condition called Raynaud’s disease. When any of us goes out in the cold, our bodies activate the muscles in our smallest blood vessels to make them even smaller—a survival mechanism to keep blood, and thus warmer temperatures, in our core. For people with Raynaud’s, this reaction is too strong, and instead of just a bit less blood going to their fingers, far too little gets there.

Raynaud’s is more common in women, and it most often develops before the age of 30. In fact, if you develop Raynaud’s when you’re older—usually after 40—it can be a sign of another underlying issue. That could be a smaller problem—a previous incident of frostbite (冻伤) or a sign of a more serious autoimmune condition, like lupus (狼疮).

For the majority of people living with Raynaud’s, medication won’t be necessary. However, a rare, more severe form of Raynaud’s affects less than one in 1,000 people. In these cases, blood can become completely blocked, causing sores on the hands. If they go untreated, it can lead to gangrene (坏疽) and, very rarely, amputation (截肢).

1.What’s the purpose of paragraph 1?

A.introduce a topic B.present an argument

C.describe the characters D.clarify his writing purpose

2.According to the text, which of the following is not the cause of cold hands?

A.diabetes B.heart disease C.aging D.obesity

3.What do we know about Raynaud’s disease?

A.It appears when blood vessels in your body overreact to high temperatures.

B.Males never suffer from it before the age of 30.

C.In some cases, it can be a sign of some health issues.

D.For most people, it is a serious health problem.

4.What will the author talk about in the following paragraph?

A.The reasons why people have cold hands

B.Ways to treat Raynaud’s disease and prevent cold hands

C.Medical research on Raynaud’s Disease

D.Disadvantages of cold hands

高三英语阅读选择简单题查看答案及解析