Recently some American scientists have given a useful piece of advice to people in industrialized nations．They say people should eat more of the same kind of food eaten by humans living more than 10,000 years ago． {#blank#}1{#/blank#}

     The scientists say that the human life has changed greatly．Our bodies have not been able to deal with these changes in life style and this had led to new kinds of sicknesses． {#blank#}2{#/blank#} So they are called "diseases of civilization"．Many cancersand diseases of the blood system are examples of such diseases.

      Scientists noted that people in both the Old Stone Age and the New Stone Age enjoyed very little alcohol or tobacco, probably none． {#blank#}3{#/blank#}  However, a change in food is one of the maindifferences between life in ancient times and that of today.

      Stone Age people hunted wild animals for their meat, which hadmuch less fat than domestic ones．They ate a lotof fresh wild vegetables and fruits．They did nothave milk or any other dairy products, and they made very little use of grains． {#blank#}4{#/blank#}  We eat six times more salt than our ancestors．We eat moresugar．We eat twice as much fat but only one third as much protein andmuch less vitamin C.

{#blank#}5{#/blank#} But scientists say that we would be much healthier if weeat much the same way the ancient people did, cutting the amount of fatty,salty and sweet food.

A．Stone Agepeople lived a simple life.

B．But today, weenjoy eating a lot of these.

C．In that case,they would live much healthier.

D．Ancient people also got lots of physical exercise.

E．These new sicknesses were not known in ancient times.

F．People today probably don't want to live like our ancestors.

G．Modern people used to suffer from "diseases of civilization".

How to be a teenage role model

    In today's world, most teen role models(楷模)are famous people. They appeal to the teenagers a lot with their looks, money and fame. {#blank#}1{#/blank#} If you are a teen out there and you want to inspire your peers(同龄人), here are a few steps that you should follow:

Build confidence.

    People always believe in those who believe in themselves.{#blank#}2{#/blank#} Build on these strengths and let them help you to develop into the kind of role model you want to be.

{#blank#}3{#/blank#}

    Having a unique character can really draw others to you more than being the same as others. This does not mean that you should give up the same interests you have with your friends, but just try to be a leader rather than a follower of others.

Be humble.

    {#blank#}4{#/blank#} Many people respect those who have accomplished a lot in their lives but are still down to earth. Remember just because you have found your confidence doesn't mean you should look down upon others.

    Play the role you have created for yourself.

    After you have gotten a positive image(形象) of yourself and a good relationship with your peers, stick to it! Be guided by your desire(欲望) to be a role model in everything you do.{#blank#}5{#/blank#}

    Having mastered the above steps, you will start noticing the positive influence you are having on others. Keep trying to better yourself as you continue to inspire others.

A. Develop your own style.

B. Choose your own role model.

C. There is nothing as golden as being humble(谦逊的).

D. Let your entire life be inspirational to others.

E. So build faith in yourself by getting to know your strengths.

F. You should overcome your weaknesses.

G. However, anybody can be a teenage role model if they put their mind to it.

    There are a lot of people who are overweight all over the world. What causes obesity? If you get the gene(基因), well, probably you are going to be a few more pounds heavier compared to the rest of your classmates or friends. {#blank#}1{#/blank#} Obesity can not only make a person look heavy, and not in the usual sense of being handsome, but can also lead to serious health conditions and life-threatening diseases.

    {#blank#}2{#/blank#} Indeed, junk food has been blamed for the prevalence(流行）of obesity. It is called junk food, because hamburger, pizza and the like contain high calories. If you eat a Big Mac (a super hamburger), an order of large fries, and a large Coke, you will need to walk non-stop for six hours to burn off the calories you have gained. And don't be fooled by soft drinks, which are high in sugar and are a major cause of obesity.

    {#blank#}3{#/blank#} Popular sugary drinks, of course, include Coca Cola, Pepsi(百事) Cola, and many new brands that appear on the market every couple of days.

    {#blank#}4{#/blank#} Just one 20-ounce (about 567g) bottle of soda can have 250 calories, which are equal to more than 16 teaspoons of added sugars. Even a lemon-flavored iced tea can have 210 calories.

    {#blank#}5{#/blank#} Next time, when you are ready to eat that huge Mac and to drink that two-liter bottle of Pepsi, probably it's a good idea to give it a second thought.

A. Obesity is more common in women than men.

B. Most people don't realize how easy it is to gain weight from drink sugar-sweetened beverages(饮料)

C. When we talk about obesity, the first thought that comes to mind is: junk food.

D. The unburnt calories will put weight on you.

E. Keeping healthy is our own responsibility.

F. Because of their high content of sugar, soft drinks are also called sugary drinks.

G. However, the most common cause of obesity is eating too much, especially too much junk food.

    English has been called one of the most difficult languages for non-native speakers to learn. One reason is that English has so many rules.{#blank#}1{#/blank#} Sometimes, this leaves learners confused(混淆). For example, the order of words in a sentence can be tricky.

    {#blank#}2{#/blank#} The pronunciation of English words cannot always be judged by their spelling. For example, there are at least six ways to pronounce the group of letters spelled o-u-g-h. And, maybe the worst thing of all is that there are many idioms, or expressions, in English.{#blank#}3{#/blank#}

    So, it is comforting to know that learning root words can help a non-native speaker use English.{#blank#}4{#/blank#} Root words can help you to break down large, new words into smaller units to discover their meanings.

    Learning just one root word can help you understand several words in English.{#blank#}5{#/blank#}Then where can a root be found? A root can be any part of a word that carries meaning: the beginning, middle or end. Prefixes, bases, and suffixes are types of roots. The prefix appears at the beginning of a word, the base in the middle and the suffix at the end.

A. A root word is the most basic form of a word.

B. The English have always been fond of all kinds of rules.

C. You could say we use idioms like they're going out of style.

D. And there are almost as many exceptions(例外)of those rules!

E. Most English root words came from the Greek and Latin languages.

F. Another reason why English is hard to learn is the pronunciation of its words.

G. So, by learning 20 or 30 root words, you can increase your vocabulary to hundreds of more new words.

    Last week the electricity in my flat went out.{#blank#}1{#/blank#} My typical evening is spent watching TV and scrolling (滚动) through social media. Tonight this wasn't possible. My roommate and I weren't prepared with candles and matches. We just rely on electricity.

    So for me it was an early night.{#blank#}2{#/blank#} That night, losing our electricity felt like losing a basic necessity, as basic as running water. But really, electricity is a luxury that we've grown to take for granted. I use electricity all the time, even when it's not really necessary.

    {#blank#}3{#/blank#} And as I'm writing this, I have my lights on, even in the middle of the day when I don't really need them.

    {#blank#}4{#/blank#}It contributes to global warming. It is harming our environment and we need to do what we can to stop it. Not only that, but if we continue to use the same large amount of energy, we will soon run out of it.

    How would we survive in a world without electricity? Our daily lives go around it. We wouldn't be able to function.{#blank#}5{#/blank#}So, shouldn't we start preparing for it now? Cutting down on our use of electricity would save energy resources so that they could last for longer. And if everyone does it, we can make a big difference.

A. Yet we know one day we will run out of it.

B. Our over-use of electricity is a big problem.

C. This left me in complete darkness the whole night.

D. It is a real problem to cut down on the use of electricity.

E. I know for sure I could cut down on my use of electricity.

F. I couldn't help but think, do we rely too much on electricity?

G. I turn on the TV in the background even when Tm not watching it.

    Talking to strangers along your travels can change your trip into an adventure. Here are rules of thumb to serve as your guide.

    Don't ignore your fellow tourists. When you go to some place off the beaten path, you're likely to meet other tourists there. Find them, and ask where you would go.{#blank#}1{#/blank#}.

    Abandon your phone. Phones often get between you and the surroundings, ruining your chances to make contact with the people you see.{#blank#}2{#/blank#}, take a deep breath and put it in a different pocket or cover it with tape.

    {#blank#}3{#/blank#}. The easiest way to do this is to talk to people who are in "open roles", such as anyone in a public service job, or a taxi driver. Or ask someone seated near you; ask where the person's favorite street is; ask if there's a residential area where it would be nice to take a walk.

    Use a map-or none at all. {#blank#}4{#/blank#}. However, the truth is, sometimes those small streets are nowhere to be found with a map. So ask for directions a lot. Asking for any kind of help is the key to many doors.

    Most Important: Ask good questions. Finding good questions means observing and noticing. A well-turned question shows that you are really paying attentions you are curious and ready to listen.{#blank#}5{#/blank#}.

A. Let strangers make your plans

B. Maps can be of great assistance

C. When the unwillingness gets in the way

D. A good question will get you everywhere

E. They are going to offer advice made of gold

F. Those fellow tourists can make sense of your journey

G. If abandoning your phone isn't practical or feels insecure to you