A

If you and your friends wish to share a secret, you can write it in code, and no one else will be able to read it. Codes are one way of writing in secret. Ciphers (密码) are another. In a code each word is written as a secret code word or code number. In a cipher each letter is changed.

Codes and ciphers have played an important role in the history of the world. Julius Caesar, the Roman ruler who defeated almost all the countries in Europe about 2, 000 years ago, used a cipher when he sent secret messages to his troops. During the American Revolution, George Washington's spies used a kind of code to send him information about the enemy before his military action. In World War Ⅱ, the Americans "broke", or figured out, Japan's most important naval codes and got enough information to destroy a powerful Japanese fleet(舰队).

Storekeepers use codes to mark their goods. The codes show how much was paid for the goods or when they were added to the stock. Businessmen use codes to hide plans from their business enemies. Sometimes personal letters or diaries are written in code. Many people enjoy figuring out codes and ciphers simply as a hobby.

In the 16th century, codes and ciphers were very popular among scientists. They wrote messages to each other in code so that no one else would learn their secrets. Geronimo Gardano, an Italian astrologer(占星家), mathematician, and doctor, invented the trellis cipher. He took two sheets of paper and cut exactly the same holes in each one. Then he sent one sheet, which he called a trellis, to a friend and kept the other for himself. Whenever he wanted to write a message, he put his trellis over a clean sheet of paper and wrote the secret message through the holes. Then he removed the trellis and filled the rest of the paper with words that would make sense. When his friend received it, he put his trellis over the writing and read the secret message.

What does the underlined word "trellis"mean?

A. A piece of paper with many small holes.          B. A machine with a lot of small holes.

C. A letter with unreadable words and sentences.   

D. A sheet of paper with groups of Arabic figures.

Which of the following statements is true?

A. Ciphers can be broken or figured out more easily than codes.

B. You could read some words in Geronimo' s letter without his trellis.

C. The first person who ever used a cipher in history was Julius Caesar.

D. Fondness of using codes was the hobby of the scientists in the 16th century.

The best title of this passage is________.

A. Codes and Ciphers                  B. Differences between Codes and Ciphers

C. History of Codes and Ciphers         D. Inventors of Codes and Ciphers

C

As A/H1N1 continues to spread, experts from the Centers for Disease Control to the World Health Organization to neighborhood doctors are calling on the people to practice smart flu prevention techniques. Here are some tips to keep body improved and immune（免疫）system ready to fight infection.

Wash Your Hands

And wash them often, in hot soapy water, and for the amount of time it takes you to sing “Happy Birthday” twice.

Get Enough Sleep

This means slightly different things to different people, but try to get 8 hours of good rest each night to keep your immune system in top flu-fighting shape.

Keep Hydrated

Drink enough water each day to clear poisonous matter from your system and keep up good moisture（湿度）production in your body.

Eat Immune-Improving Foods

Keeping you body strong and ready to fight infection is important in flu prevention. Fatty foods can slow your metabolism（新陈代谢）, make you feel inactive, and weaken your immune system. So stick with whole grains, colorful vegetables, and vitamin-rich fruits.

Avoid Alcohol

Alcohol is likely to decrease your resistance to infections and further damages the immune system. So avoid alcoholic drinks to keep your immune system strong.                         

Proper exercise-for example walking for 30-40 minutes 3-4 times a week-supports the immune system by increasing circulation, oxygenating the body, removing poisonous material through sweat, and reducing tension and stress. So get moving!

Avoid Contact with Sick People

If you’re coughing or sneezing, cover your mouth(and then wash your hands),and if you have to be around someone who is sick, try to stay a few feet away from them and avoid physical contact.

Know When to Get Help

A/H1N1 can look like regular flu, so don’t feel like you necessarily are infected if you’re exhibiting flu-like symptoms（症状）. But do go to your doctor if you live in an area where there are recorded cases, or if your symptoms are very serious.

44．To fight A/H1N1 infection, it’s helpful for us to_______ .

       A．sing “Happy Birthday” while washing hands

       B．eat more fatty foods and colorful fruits

       C．keep away from alcoholic drinks

       D．refuse communication with patients

45．A suitable title for paragraph 7 might be _______.

       A．Support the Immune System     B．Keep Physically Active

       C．Get Enough Sweat             D．Walk to Reduce Stress

46．The passage seems to suggest that we should_______.

       A．get enough sleep after eating fatty foods

       B．wash hands with soap after a cough or sneeze

       C．drink more water after drinking alcohol

       D．see a doctor immediately if you have flu-like symptoms

47．What can help clear poisonous matter from the body?

       A．Washing your hands.       B．Eating fatty foods.

       C．Getting enough sleep.      D．Drinking enough water.

What is freedom? It seems like such a simple question. Freedom is being able to do what you want to do. Allow me to explain it.
I’m tired of working for a living. I’d rather collect taxes. So that’s what I’m going to do: collect a kind of tax. You are ordered to estimate your income from the past 12 months, and write me a check for 1%. I have provided a mailing address for this purpose on my contact page …
What? You have a problem with my plan? Oh, I see. If you have to send me a check for the tax, then I have hurt your freedom to spend that money as you see fit. We have a conflict! And our basic problem is: we cannot enjoy freedom at the same time; we must settle for a limit. But what limit?
Libertarians (自由论者) believe freedom should be based on self-control. They describe freedom as being able to do what you want to do as long as it doesn’t influence the equal right of others to do what they want to do. That is, freedom is being able to do what you like as long as you do not harm another person’s life, liberty or property.
You can build a set of legal and ethical (道德的) rules on the principle of self-control, and libertarians do. Their request for self-control often becomes more important than common sense, or even freedom itself.
The definition rules out the freedom to steal, murder, and so on. Otherwise, you can do whatever you want. There is no problem until you realize that taxation is theft, that war is murder, and that national service is a form of slavery. Since only the government has a legal right to use force, libertarians focus on making the government smaller, or even going without it. The libertarians’ definition of freedom is thus freedom from the government. Isn’t it ridiculous?

1. 1.

   According to the first three paragraphs, the author’s idea of collecting taxes is _________.

   1. A.
      reasonable
   2. B.
      responsible
   3. C.
      unacceptable
   4. D.
      understandable
2. 2.

   The author takes tax-collecting as an example in the passage to prove that freedom is _________.

   1. A.
      unreal
   2. B.
      unbelievable
   3. C.
      achievable
   4. D.
      limited
3. 3.

   In the opinion of libertarians, freedom is realized mainly by _________.

   1. A.
      the law
   2. B.
      self-control
   3. C.
      ethical rules
   4. D.
      common sense
4. 4.

   Which of the following statements is supported by libertarians according to the passage?

   1. A.
      National service should be canceled.
   2. B.
      People can do whatever they want.
   3. C.
      The government should have more power.
   4. D.
      They should be governed by the government.

If you are in a town in a western country, you'll often see people walking with their dogs. It is still true that a dog is the most useful animal in the world. But the reason why one keeps a dog has changed Once upon a time, a man met a dog and wanted it to help him in the fight against other animals, and he found that the dog listened to him and did what he told him to. Later people used dogs for the hunting other animals, and the dogs didn't eat what they got until their master agreed. So dogs were used for driving sheep and guarding chicks. But now the people in the towns and cities do not need dogs to fight other animals. Of course they keep them to frighten thieves, but the most important reason is that people feel lonely in the city. For a child, a dog is his best friend when he has no friends to play with. For a young wife, a dog is her child when she doesn’t have her own. For old people, a dog is also a child when their real children have grown up and left. Now people do not have to use a dog, but they keep it as a friend, just like a member of the family.

_______are more useful than a dog in the world.

   A. No other animals  B. Some animals  C. Many animals  D. A few animals

In the past people kept dogs because dogs _________.

   A. could fight against other animals    B. met the people

   C. did not eat other animals           D. helped and listened to people

Now people keep dogs in the cities because dogs_____.

   A. fight other animals              B. are lonely

   C. are like their friends             D. are afraid of the thieves

A dog can be _____.

   A. a child's friend only             B. a young woman's son

   C. old people's real child            D. everybody's friend

So a dog will __ in a family.

   A. always be used                 B. not be useful 

C. still fight                      D. always be a good friend

  What time is it? Most people are pretty accurate in their answer. And if you don’t know for sure, it’s very likely that you can find out. There may be a watch on your wrist; there may be a clock on the wall, desk, or computer screen; or maybe you’re riding in a car that has a clock in the dashboard(仪表板).

   Even if you don’t have a timepiece of some sort nearby, your body keeps its own beat. Humans have an internal clock that regulates(调节) the beating of our heart, the pace of our breathing, the discharge(排出) of chemicals within our bloodstream, and many other bodily functions.

  Time is something from which we can’t escape. Even if we ignore it, it’s still going by, ticking away, second by second, minute by minute, hour by hour. So the main issue in using your time well is, “Who’s in charge?” We can allow time to slip by and let it be our enemy. Or we can take control of it and make it our ally. 

   By taking control of how you spend your time, you’ll increase your chances of becoming a more successful student. Perhaps more importantly, the better you are at managing the time you devote to your studies, the more time you will have to spend on your outside interests.

   The aim of time management is not to schedule every moment so we become slaves of a timetable that governs every waking moment of the day. Instead, the aim is to permit us to make informed choices as to how we use our time. Rather than letting the day go by, largely without our awareness, what we are going to discuss next can make us better able to control time for our own purposes.

The underlined word “ally” in Para.3 most likely means somebody or something that is ___.

A. your supporter and helps you          B. under your control and obeys you

C. under your influence and follows you   D. your slave and serves you

The author intends to tell you that time __________.

A. could be managed by the internal clock of human bodies

B. should be well managed for our own interest

C. should be saved for outside interests

D. could be regulated by a timepiece such as a clock or a watch

In the next part, the author would most probably discuss with you _________.

A. how to make up for lost time      B. how to have a good time

C. how to make good use of time     D. how to keep up with the times