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 three main 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 “135520135.”

    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.

    It's not easy to just get up and go if you're not a morning person. But with some preparation, you can have a great morning routine (常规) before school, which can also make for a good day.

    {#blank#}1{#/blank#} A great morning routine doesn't include cramming (突击式学习) for a test or struggling to get your homework done as you're running out of the door.

    Shower the night before. {#blank#}2{#/blank#} And if you can, do your hair the night before so when you wake up, you'll be able to freshen yourself quickly to get to school and get on with the day.

    Lay out your clothes. {#blank#}3{#/blank#} Make sure to lay out everything you need, including your socks and shoes. Another thing is hair. If your school has a preference (偏爱) of what you do with your hair, be sure to respect that.

    {#blank#}4{#/blank#} It helps in the morning if you have something in front of you to check off as you're walking out of the door. The list should include your homework, books and your lunch or lunch money as well as anything else you normally take with you to school.

    Eat a good breakfast. {#blank#}5{#/blank#}  Eating a healthy breakfast helps improve your focus and allows you to stay active in your classes. If you can, prepare your meal the night before. At the least, set out your spoons and plates.

A. Make a list of everything you will take.

B. Brush your teeth after you eat breakfast.

C. Get all your homework done before going to bed.

D. Check the weather forecast and choose your clothing.

E. A great morning routine should always include a good breakfast.

F. Don't hurry and make sure you have everything before you leave.

G. That helps you have a good sleep and save much time in the morning.

    Four Habits to Help you Succeed

    We all want to succeed, whether it's in losing weight or learning the guitar. For those who have tried and failed, success seems difficult to understand. Why does one person succeed while another person fails?{#blank#}1{#/blank#}

    ⒈ Identify your core values.

    Finding your core values is in line with (符合) creating inner motivation.{#blank#}2{#/blank#}Pick a handful of things and actually write them down. Remind yourself of your values every day, and reflect on whether you are honoring those values through your work.

    ⒉ Pick a goal and focus on it.

    Choose one goal to start something large enough that will give you a sense of accomplishment, while adjusting well to your core values. Focus is key here.{#blank#}3{#/blank#}If you perform many tasks at a time, you might never complete your projects because they will take far too long.

    ⒊ Set a deadline for success.

    Set a date for success. Identify when you hope to achieve your goal.{#blank#}4{#/blank#} By setting a time limit, you are making the process more real.

    ⒋ {#blank#}5{#/blank#}

    Failure can't be avoided when you take risks. By its very definition, the desire to succeed means you are risking failure. Many people tend to give up far too early. Don't fail into this trap! Remember your mindset earlier. Know it will happen. A failure is only you working out the details, and learning what works and what doesn't. Use failure. Treat it as a good thing, and march on!

A. Stick to your goal.

B. Make the right decision.

C. Sit and reflect on what you value most.

D. Keep it realistic, while not giving you too much time.

E. I've made a list of four habits to help you set goals and achieve them.

F. The more focused you are on one goal, the higher chance you have of success.

G. Push yourself to be courageous, and take that next step.

    Global Positioning System (GPS) is now a part of everyday driving in many countries. It is a space-based system that provides position and time information in all weather conditions. GPS can help people get to where they want to go.{#blank#}1{#/blank#}When this happens, the driver is often to blame. Sometimes a GPS error is responsible. Most often, it is a combination of the two.

    {#blank#}2{#/blank#}Barry Brown, a GPS technologist, took an incident as an example. His friend once flew to an airport in the eastern United States. There he borrowed a GPS-equipped car to use. He wrongly plugged in the home address in the west. It wasn't until he was driving for thirty minutes that he realized it. Mr. Brown says this is a common human error. But he says, “One problem is that GPS has a very small screen and it can just tell you the next turn.{#blank#}3{#/blank#}”

    “The Normal and Natural Troubles of Driving with GPS” lists several areas where GPS can cause difficulties. They include maps that are outdated, incorrect or difficult to understand. {#blank#}4{#/blank#}GPS may fail due to these reasons and then lead to confusion for the drivers.

    Although GPS sometimes causes difficulties when people are driving, the most attractive point of this system is its 100% coverage on the planet. It is important for you to have to know what you are doing when you use GPS. You need to have the “ability” to be able to use GPS because it sometimes goes wrong.{#blank#}5{#/blank#}

A. There are quite a few situations showing the problems of using GPS.

B. That means that it is not really telling you about going to the wrong place.

C. This space-based system is an important tool for civil and commercial users.

D. But sometimes it sends you to the wrong place or leaves you completely lost.

E. They also contain timing problems related to when GPS commands are given.

F. Advances in technology play an active role in modernizing GPS in many ways.

G. To make GPS well used, you need a good understanding of how drivers and GPS work.

    Ways to Create Calm in Your Daily Life

    Most of us need some space for calm in our lives. A few simple minutes can create much needed moments of calm. {#blank#}1{#/blank#} You can use these skills to create calm in your busy schedule.

    Go walking. Walking is perfect and you can do it well anywhere. Simply walking and taking in the view is stress reducing. {#blank#}2{#/blank#}It makes room for new ideas to take root. Appreciate nature. When we think of nature we think of getting out into the open air, and that's great if you can.  {#blank#}3{#/blank#}Actually, nature is everywhere. Find a park or a small patch (小块地)of great green, or just stick your head out of the window! You have many ways to appreciate nature.

    Listen to music. Many people listen to music to calm themselves down. Music actually lifts us out of ourselves. Discover what music works for you. {#blank#}4{#/blank#}

    Do some activities. Certain activities like yoga and tai chi need quiet focus. {#blank#}5{#/blank#} They are good for the body, mind and spirit.

    Classes are a good place to begin, but once you learn the skills, you can practice anywhere: home, school or even on the road.

    Try out some of these ways and you'll soon be practicing "moments of calm".

A. But what if you are in the city?

B. Notice the animals around you.

C. They are perfect for active calming.

D. Music is a way to express the way that they are feeling.

E. It's a time to get stressful thoughts out of your head

F. With enjoyable music even work can be "music to your ears".

G. You don't have to find a mountain to sit on, or empty your mind of all thoughts for hours.

The science of setting goals.

It's the time of year when we think to ourselves:our New Year's resolutions will totally work out this time. {#blank#}1{#/blank#}. But what if this year really could be different? Kelly McGonigal, a psychologist, shares four tips. 

Choose a goal that matters, not just an easy win. Our brains love rewards, so we often set simple goals that make it easy to check off boxes. But if that's all are about, no wonder we end up abandoning them so quickly. A meaningful goal requires going deeper. {#blank#}2{#/blank#}. For example, if you want to quit eating junk food, ask why you want to quit it. Then, if you want to quit it for your health, ask why you want good health.

{#blank#}3{#/blank#}.When we set goals, it's easy to focus on that magical ending. But we can't control outcomes. We have to inch toward them, one choice at a time. Ask yourself, "What is the smallest thing I can do today that helps me reach my goal?" If you make daily choices that are consistent with your goal over and over again, you will eventually reach it. 

Frame your goals positively. Focusing on what you want to bring into your life –not what you want to avoid – will make you more likely to actually pursue it. "Any sort of avoidance is going to trigger inhibition systems, {#blank#}4{#/blank#}," says McGonigal.

Prepare for failure. Moments of failure are inevitable, but most of us abandon the goal entirely when minor failures and setbacks start piling up. Your task is not to avoid failures, but to plan for them. Ask yourself, "How am I likely to fail?" For example, if you‘re likely to choose unhealthy meals when you're hungry, carry a light snack that can tide you over. {#blank#}5{#/blank#}.

A. Focus on the process, not the outcome

B. Psychologists call this an emergency plan

C. It really drives home why that goal matters

D. Never mind that we abandoned them very quickly

E. How you describe your goal makes a big difference

F. Think about what you want, and then ask yourself why

G. But positive goals are going to trigger approach and reward motivation