根据短文内容，从短文后的选项中选出能填入空白处的最佳选项，选项中有两项为多余选项。

      Secret codes (密码)keep messages private。Banks, companies, and government agencies use secret codes in doing business, especially when information is sent by computer.

     People have used secret codes for thousands of years. {#blank#}1{#/blank#}  Code breaking never lags(落后) far behind code making. The science of creating and reading coded messages is called cryptography.

     There are threemain types of cryptography. {#blank#}2{#/blank#}  For example, the first letters of “My elephant eats too many eels” Spell out the hidden message “Meet me.”

{#blank#}3{#/blank#} You might represent each letter with a number, For example, Let's number the letters of the alphabet, in order, from 1 to 26. If we substitute a number for each letter, the message “Meet me” would read “13 5 20 13 5.”

     A code uses symbols to replace words, phrases, or sentences. To read the message of a real code, you must have a code book. {#blank#}4{#/blank#} For example “bridge“ might stand for “meet” and “out” might stand for “me.” The message “bridge out” would actually mean “Meet me.” {#blank#}5{#/blank#}  However, it is also hard to keep a code book secret for long. So codes must be changed frequently.

A. It is very hard to break a code without the code book.
B. In any language, some letters are used more than others.
C. Only people who know the keyword can read the message.
D. As long as there have been codes, people have tried to break them.
E. You can hide a message by having the first letters of each word spell it out.
F. With a code book, you might write down words that would stand for other words.
G. Another way to hide a message is to use symbols to stand for specific letters of the alphabet.

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    Sleep, as we know, is important to us because it helps restore tired organs and tissues in our body. But how much sleep do we actually need?

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    For most of us, eight hours seems to be about the right amount. Yet we know that there are a great many people who get along perfectly with less sleep and some who may even need more. A great deal depends on the way we live. But a good general rule to follow is to sleep as long as we have to in order to feel happy and be able to work at our best when we are awake.

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    There are actually different levels of sleep. There is a deep sleep and a shallow sleep. In a shallow sleep our body does not get the same kind of rest as it gets in a deep sleep, so that after eight hours of a shallow sleep we may still feel tired. But a short deep sleep can be very restful.

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    Alexander the Great was able to get a deep sleep whenever he needed it. Once, during the night before an important battle, he remained awake longer than anyone else. Then he wrapped himself in a cloak and lay down on the earth. He slept so deeply that his generals had to wake him three times to give command to attack!

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    Normally when we go to sleep, our “ sleep center” blocks off nerves so that both our brain and our body go to sleep. One prevents us form wanting to do anything and the other makes our internal organs and limbs go to sleep. But someone will fall asleep (brain sleep) and keep on marching, because his body is not asleep!

    Six Things You should Never Do Before the Queen

    ※Don't show up empty handed.

    What do you get the woman who already has everything? Sure, the Queen has several homes full of priceless trinkets（饰品）, but bringing a gift is necessary. {#blank#}1{#/blank#} So if she's paying a visit to your hometown or country, something which reflects local culture might go down better than W.H. smith's vouchers（优惠券）.

    ※{#blank#}2{#/blank#}

You may be dead on your painful feet—but you should always stand when the queen enters the room. You may only sit once she has taken the seat, so keep a close eye on when the Queen sits down herself.

    ※Don't ignore the dress code.

    Regardless of how late you're running or how tempting it is to stay in your casual clothes, make sure you dress accordingly when meeting HRH. {#blank#}3{#/blank#}

    ※Resist the temptation to refer to her by her first name.

    While the Royal family may be extremely familiar to us, and while we may have our own nicknames for them, we common folk still aren't on a first name basis with them. So, when you meet the Queen she should be addressed as “Your Majesty” and “Ma'am” consequently after. When she leaves, however, you must address her as “Your Majesty” once again.

    ※Only speak if the queen speaks to you.

    Remember when you were a small child and all your elders would drop wisdom such as “don't speak unless spoken to first” and “children should be seen and not heard”? {#blank#}4{#/blank#} This rule exists so Her Royal Highness can control every aspect of the conversation-- including exiting it swiftly.

    ※Don't eat before she does.

    No matter how tasty and tempting the banquet morsels spread in front of you look, you can only start eating once the Queen does. So perhaps have a quick snack beforehand, in case any speeches go on for a long time. {#blank#}5{#/blank#}

A. Stand to attention.

B. Watch out for Queen.

C. Oh, and if she has finished eating, you'd better be full too.

D. If the event is black tie, wear black tie.

E. You are supposed to listen to them though you've grown up.

F. This gift must also be appropriate to the occasion.

G. The same applies to meeting the Queen.

    English is one of the most difficult languages to master. Even if you might not yet sound like someone born and raised speaking the language, you should still congratulate yourself on how far you've come. Remember that practice makes perfect. So keep working at it and your skill level will certainly improve.

    Create an English environment for yourself. {#blank#}1{#/blank#}The more you hear the language, the better you'll understand how and when to use common words and phrases and how the language is pronounced.

    Practise speaking English every chance you get, whether at school, at work or speaking to family and friends. When you speak in your native language, ask yourself, “How would I say that in English?”

    Watch yourself speak English in the mirror. {#blank#}2{#/blank#} And practise changing anything you don't like. If you're uncomfortable making up things to say to yourself, just read your lessons aloud.

    Use confident body language while you speak English. Even if you're having trouble pronouncing words or remembering phrases, don't keep your head down. Speak in a natural, conversational tone(语气); keep your back and head straight, and your chin(下巴) up. If you're in a relaxed setting, put your hands behind your head and put your feet up.{#blank#}3{#/blank#} 

    Find a language friend who speaks fluent English and wants to learn your language. {#blank#}4{#/blank#}Increase your confidence by knowing you have something valuable to teach, as well as something to learn.

    {#blank#}5{#/blank#} Instead of saying “I'm no good at this,” say “Every day I'm getting better.”
A. Take turns teaching each other.
B. Train your body into feeling in control.
C. Speak confidently about your English ability.
D. Learning a language requires long hours of study and practice.
E. Get comfortable with the way you look speaking the language.
F. Read books, watch television shows, movies and plays in English.
G. Improve your confidence by teaching those worse at English than you.

    How to become a better reader?

    Language and literacy(读写能力) are among mankind's greatest inventions. Evolving and even dying over the course of human history, languages are a reflection of our cultural and societal attitudes. Most humans acquire language in early childhood and speak fluently when they are about three years old, but our continued relationship with language gives shape and meaning to our lives. {#blank#}1{#/blank#}

    ⒈Take it slow

    Many readers feel that they read too slowly, especially compared with others but the truth is that the faster you read, the less likely you are to comprehend fully what you're reading. {#blank#}2{#/blank#} Reading is a lifelong process; learning to read closely and slowly will help you become faster over time without missing anything.

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    When humans first began reading written words, it was unusual to read in silence. Though general inappropriate for commuters or for late-night adventurers, reading out loud is one of the best ways to improve your reading ability. {#blank#}4{#/blank#} If so, you will begin to read more accurately and with better vocal expression. Try listening to the author reading their own work-you'll be surprised to find how clearly it comes through on the page.

    ⒊Write

    {#blank#}5{#/blank#} How and what you read affects how and what you write, and the best readers often make the best writers. But while much can be learned from close, repeated readings, there are many secretive pleasures to language that can only be experienced through the practice of writing.

A. Read aloud.

B. Get into the rhythm of the authors voice.

C. Here are 3 ways to become a better reader.

D. Writing and reading go hand -in-hand.

E. Try writing every day for a month; you will never read the same again.

F. The ability to read is important to form an identity and express one's feelings.

G. In that case, do not hesitate to re-read the passage.

    Entering a university is an important part of a person's life. Today, many people go to a university to study and train for a future job in subjects like law, medicine or education. {#blank#}1{#/blank#} An important one started in Egypt over one thousand years ago.

    The world's oldest surviving university, AL-Azhar, is in Cario, Egypt. It was first built as a mosque for religion (宗教寺院) in A.D.972. A few years later, learners and teachers began meeting in the mosque. They read and talked about the subject of religion and law. {#blank#}2{#/blank#} Leaders in the city of Cario decided to create a school for higher learning and soon after that, and AL-Azhar University was founded.

    {#blank#}3{#/blank#} For these teachers at AL-Azhar, they needed to think about what courses to teach and how to teach them. The earliest courses were in law and religion. In a course, students read and studied with the teachers, but there was also free discussion. Often, students and teachers had interesting discussions, and there was no ‘right' answer. In the years that followed, the new university interested scholars from around the world. {#blank#}4{#/blank#} At AL-Azhar, people studied the past, but it was also a place for sharing new ideas.

    Over a thousand years later, AL-Azhar is still an important university in the world. {#blank#}5{#/blank#} Today, many of the world's most important universities such as Oxford and Harvard still follow the same traditions as they do at AL-Azhar.

A. However, the university is not a modern invention.

B.There are many reasons to study in Egypt.

C.They came here to teach and do research.

D.Around the year 988, a new decision was made.

E. Its library contains many of the world's oldest and most valuable books.

F. The cost of university education is increasing year by year.

G. A university was a new idea at that time.