A strong memory depends on the health and vitality （活力） of your brain. They say that you can't teach an old dog new tricks, but when it comes to the brain, scientists have discovered that this old saying simply isn't true. {#blank#}1{#/blank#}

      Give your brain a workout. Memory, like muscular strength, requires you to “use it or lose it”. The more you work out your brain, the better you'll be able to process and remember information.{#blank#}2{#/blank#}

        Don't skip the physical exercise. While mental exercise is important forbrain health, that doesn't mean you never need to break a sweat. Physical exercise helps your brainstay sharp. It increases oxygen to your brain and reduces the risk for disorders that lead to memory loss.

        Get enough sleep. There is a big difference between the amount of sleep you can get by on and the amount you need to function at your best.{#blank#}3{#/blank#}Keep stress in check. Stress is one of the brain's worst enemies. Over time, stress destroys braincells. Studies have also linked stress to memory loss.

        Have a laugh.{#blank#}4{#/blank#} That holds true for the brain and the memory, as well as the body. Unlike emotional responses, which are limited to specificareas of the brain, laughter engages multiple regions across the whole brain.

{#blank#}5{#/blank#}Just as the body needs fuel, so does the brain. You probably already know that a diet based on fruits, vegetables, whole grains, “healthy”fats and lean protein will provide lots of health benefits, but such a diet can also improve memory. For brain health, though, it's not just what you eat—it's also what you don't eat.

A. Eat a brain-boosting diet.

B. Play games with memory.

C. Laughter is the best medicine.

D. But oversleeping is not good for yourbrain.

E. Even skipping a few hours makes adifference!

F. You have to shake things up from timeto time!

G. The human brain has an astonishingability to adapt and change.

What is bitcoin?

    Bitcoin is a kind of digital currency, which means it doesn't exist as banknotes. At first, bitcoins were only made for collectors. {#blank#}1{#/blank#} You can store it in an online “wallet”. And with that wallet, you can spend bitcoin online and in the physical world for goods and services. More and more businesses, restaurants and universities included, accept payments in bitcoins. And, of course, bitcoin has a valuation, which you may have heard about because bitcoin's price has fluctuated up and down.

    What's different about bitcoin?

    {#blank#}2{#/blank#} That card is connected to information about you, such as your name and billing address. You can use bitcoin the same way, but unlike with a credit card, the trades you make with the currency are completely anonymous（匿名的）. They can't be used to identify you personally. {#blank#}3{#/blank#} Is that why the WannaCry attackers picked it as a form of payment?

    {#blank#}4{#/blank#}

    The bitcoin currency is unique—no authority can change the value. It's quick and easy to set up a bitcoin account. It's fast—it only takes a few minutes to transfer your payments. {#blank#}5{#/blank#}

    Possibly, Bitcoin has certainly gained fame in the news media as a technology that can result in crime. But even though the identities of people in a bitcoin trade may be hidden, the public ledger has increasingly helped law trace the movement of bitcoins from place to place.

A. What makes the bitcoin currency unique?

B. Another way of exchanging g bitcoins is at ATMs.

C. So you can use bitcoin to protect your privacy.

D. It's cheap—trade fees are usually zero, or less than 1 US cent.

E. Usually, if you pay for something on the Internet, you use a credit or debit card.

F. However, you can buy it with dollars or euros,, just like you can trade any other currency.

G. The bitcoin was introduced on the internet in 2008 by a software developer called Satoshi Nakamoto.

    Maybe you are an average student. {#blank#}1{#/blank#}This is not necessarily so, however. Anyone can become a better student if he or she wants to. Here's how.

    Plan your time carefully. When planning your work, you should make a list of things that you have to do. After making this list, you should make a schedule of your time. First your time for eating, sleeping, dressing, etc. Then decide a good, regular time for studying. {#blank#}2{#/blank#}A weekly schedule may not solve all your problems, but it will force you to realize what is happening to your time.

    Find a good place to study. Look around the house for a good study area. Keep this space, which may be a desk or simply a corner of your room, free of everything but study materials. No games, radios, or television. When you sit down to study, concentrate on the subject.

    Make good use of your time in class. {#blank#}3{#/blank#}Listening carefully in class means less work later. Taking notes will help you remember what the teacher says.

    Study regularly. When you get home from school, go over your notes, review the important points that your teacher is going to discuss the next day and read that material. {#blank#}4{#/blank#}If you do these things regularly, the material will become more meaningful, and you'll remember it longer.

    Develop a good attitude towards tests. The purpose of a test is to show what you have learned about a subject. They help you remember your new knowledge. The world won't end if you don't pass a test, so don't be over worried.

    {#blank#}5{#/blank#}You will probably discover them after you have tried these.

A. There are other methods that might help you with your studying.

B. Don't forget to arrange enough time for entertainment.

C. Make full use of class time to listen to everything the teacher says.

D. No one can become a top student unless he or she works hard.

E. You probably think you will never be a top student.

F. Make full use of class time to take notes of what the teacher says in class.

G. This will help you understand the next class.

    Want to know how to be a confident friend-finder? We can help, with four easy steps.

    Step 1. Change your mental state.

    It's easy to get so freaked out（不安的）about being in a new situation that you start throwing off don't-come-near-me signals. And guess what? It worked. {#blank#}1{#/blank#}Instead, change your attitude with some positive thinking. Tell yourself: “It'll be great to get to know someone new”, or “I can't wait to hear what these girls have to say.”

    Step 2. Remember, the eyes have it.

    The first place we look at when we're uncomfortable is the floor. No one can tell if we're embarrassed. We can't tell if anyone is looking at us. Whoa! {#blank#}2{#/blank#}Holding your head up and making eye contact is a bold（大胆的）move． It's confident and friendly.

    Step 3.{#blank#}3{#/blank#}

    Does starting a communication bring on an attack of shyness? Try adding a good question to your friend-finding tools. Strong opening questions usually begin with “what” or “how” words that get people talking. Typically, our first instinct (本能) is to ask a “can” or a “do” question, like “Can I borrow a pencil?” or “ Do you know where the bathroom is? {#blank#}4{#/blank#}Asking “what” or “how” questions gets you more information to respond to. Try something like “Hi. I really like that flower. How did you draw it?” or “Hi. I'm new. What's the least scary lunch option in the cafeteria?”

    Step 4. Practice, practice, practice.

    Making new friends is a skill. {#blank#}5{#/blank#}But the more you practice, the more relaxed and natural. You'll feel, and the easier it will get. So flash that smile, offer some welcoming words, and soon you'll be hanging out with your newest friends!

A. People don't come near you.

B. All you need is one question.

C. Listen closely to their answers.

D. Not a good way to meet people.

E. The thought of meeting people makes you excited.

F. But that only gets you short answers. Like “Yeah” or “Down the hall”.

G. Like art, music, or sports, it takes practice to feel truly confident of it.

    People have always wanted to know what the future will look like. Then, how can we? {#blank#}1{#/blank#} The world has changed a lot in the last 150 years, but we humans are driven by the same basic needs as we were 150 years ago, such as food, sleep, the feeling of being appreciated and loved. {#blank#}2{#/blank#} No. In addition, generally speaking, the inventions for the last 150 years have been a human effort for freedom and communication, to be able to get in control of the time and world. Since there is still much to do in this area, this will be the focus at least for the next150 years.

    But why do we need to predict the future? Predicting the future is important for two reasons: First, we need to start to think about what kind of future we would like for ourselves and to pass on to the next generation. {#blank#}3{#/blank#}

    How about the virtual worlds? It might be in the future to experience the sand between your toes, and hear the waves, just lying in your bed at home. {#blank#}4{#/blank#} So, even if a great invention is there for an affordable price, it'll never take the place of the common experience if it is not real.

    {#blank#}5{#/blank#} What we'll see in the next 50 years is the transition (过渡) from an oil-dependent society to a new society. Here there'll be new medicine, continued exploration of space, challenges in the climate change, and new inventions that make life a little easier.

A. Will this change in the next 150 years?

B. So what will the future look like then?

D. Well, to understand the future, you must know the past.

E. However, you'll never get the feeling of being there.

F. However, no matter how real the experience will feel, it doesn't happen for real.

G. Then we need to know what decisions we need to make today that will give the best result in the future.

    Are you truly happy? What does it mean to be happy? What does it take to achieve happiness? {#blank#}1{#/blank#} The following are a few tips that I follow to create happiness in my life.

    Make a plan for achieving goals that you believe will make you happy. Your moods (心情) will very likely increase if you are going after something you value.

    {#blank#}2{#/blank#} It is easy to begin to think negatively when you are surrounded by people who think that way. On the contrary, if you are around people who are happy, their emotional state will be infectious.

    When something goes wrong, try to figure out a solution (解决办法) instead of being absorbed in self-pity. Truly happy people don't allow setbacks to affect their mood because they know that with a little thought they can.

    Spend a few minutes each day thinking about the things that make you happy. {#blank#}3{#/blank#} And this will lead you to continuous happiness.

    {#blank#}4{#/blank#} Whether you treat yourself to lunch  take a long, relaxing bath or simply spend a few extra minutes on your appearance, you will be subconsciously putting yourself in a better mood.

    Finding the humor in situations can also lead to happiness. Find a way to make light of a situation that would otherwise make you happy.

    Keeping healthy is another way to achieve happiness. {#blank#}5{#/blank#}

A. Surround yourself with happy people.

B. There are some tips in life that lead to happiness.

C. Eating healthy foods or being fit can have a great effect on your mood.

D. These few minutes will help you focus on the positive things in your life.

E. What makes you happy may be different from what makes someone else happy.

F. It is also important to take some time each day to do something nice for yourself.

G. These are important questions for anyone who is seeking happiness to ask themselves.