In the world nothing is more important than health. If people took away our money, houses, cars, or even our clothes, we could still survive. {#blank#}1{#/blank#}Then how can we keep healthy?

    First of all, we should eat healthily. I usually avoid eating food high in fat, like French fries or cookies, which are junk food. {#blank#}2{#/blank#} I only eat little meat. {#blank#}3{#/blank#} It helps us build a strong body. Regular exercise is an important part of keeping me healthy. In addition, I think friends are an important part of one's health. {#blank#}4{#/blank#}I always feel better when I am with friends than when I am alone. When I am with my friends, I always laugh. Laughing is also an important part of health. It is good to stay with my friends.

    By eating properly and exercising regularly, I can keep my body at a proper weight and keep healthy. By spending time with my friends, I can keep my mind as well as my body happy. These things sound easy to do, but not many people can manage them. {#blank#}5{#/blank#}

A. But if our health were taken away, we could surely die.

B. Some people appear fat because they often eat too much.

C. I think a strong will is necessary if we want to keep fit.

D. Many studies show that people with few friends often get sick.

E. There are some people who like staying alone, but they keep healthy.

F. What's more, taking exercise is very important.

G. I eat a lot of vegetables and fresh fruits which are full of vitamins.

    {#blank#}1{#/blank#} I say this a lot because it's important: you need to walk more. There are a few main reasons why I'm so fond of walking, also known as moving frequently at a slow pace.{#blank#}2{#/blank#}Walking might not be as effective as other forms of exercise, but frequent walking will help anyone with two functioning legs that allow movement who would otherwise meld into the couch lose some body fat.

    It's good for your brain.

    Walking does much more than work the area underneath your neck. The farther an older person can walk in six minutes, the better he or she performs on memory and logic tests. Folks who perform poorly on the walking test tend to have reduced grey matter volume in certain sections of their brains.

    It reduces stress.

    {#blank#}3{#/blank#} Go for a walk, preferably in a natural setting. For me, it's the beach of the Malibu hills. For others, it might be the woods or even a park.

    It prevents falls in the elderly.

    Walking on uneven, natural ground like hiking trails, improves balance and reduces falls in the elderly. {#blank#}4{#/blank#} The earlier you start habitually walking, the better your ability to navigate the land without falling will be.

    It gives you a chance to think.

    When we walk, we think. And because walking is a low-difficulty effort, we can direct our executive functioning to more internal matters. We work through problems, come up with ideas, replay conversations, scheme, and discover solutions. {#blank#}5{#/blank#}

A. It modestly reduces body fat.

B. It lowers blood pressure, especially after meals.

C. Don't wait until you're already at risk of falling, though.

D. What do I do when I need to get away from a particularly stressful day?

E. Try to keep the walk as close to the meal as possible to aid in weight loss.

F. Even though some of you may be tired of me saying this, it needs saying.

G. Or maybe we just think about that funny dog we saw on the way to work the other day.

    Perhaps you've heard the old saying “curiosity killed the cat.” It's a phrase that's often used to warn people—especially children—not to ask too many questions. {#blank#}1{#/blank#}In fact, research has shown that curiosity is just as important as intelligence in determining how well students do in school.

    Curiosity can also lead us to make unexpected discoveries, bring excitement into our lives, and open up new possibilities. {#blank#}2{#/blank#}For example, one day in 1831, Michael Faraday was playing around with a coil(线圈) and a magnet(磁铁) when he suddenly saw how he could produce an electrical current. At first, it wasn't clear what use this would have, but it actually made electricity available for use in technology, and so changed the world.

    {#blank#}3{#/blank#}On one level, this is because technology has become so advanced that many of us are unable to think too deeply about how exactly things work anymore. While it may be possible for a curious teenager to take a toaster apart and get some sense of how it works, how much do you understand about what happens when you type a website address into a browser? Where does your grasp of technology end and the magic begin for you?

    In addition to this, there's the fact that we all now connect so deeply with technology, particularly with our phones. The more we stare at our screens, the less we talk to other people directly. {#blank#}4{#/blank#}Then we feel we know enough about a person not to need to engage further with them.

    The final—and perhaps most worrying—way in which technology stops us from asking more has to do with algorithms, the processes followed by computers. As we increasingly get our news via social media, algorithms find out what we like and push more of the same back to us. {#blank#}5{#/blank#}Perhaps the real key to developing curiosity in the 21st century, then, is to rely less on the tech tools of our age.

A. It is still not known why learning gives us such pleasure.

B. We are always encouraged to challenge our pre-existing beliefs.

C. Yet it's widely agreed that curiosity actually makes learning more effective.

D. All too often we accept the images of people that social media provides us with.

E. However, curiosity is currently under the biggest threat, coming from technology.

F. In science, basic curiosity-driven research can have unexpected important benefits.

G. That means we end up inside our own little bubbles, no longer coming across new ideas.

    In an online class, developing healthy patterns of communication with professors is very important. {#blank#}1{#/blank#} While I have only listed two of each, there are obviously many other situations that can arise. Students should be able to extend the logic（逻辑）of each to their particular circumstance.

    Do's

    •{#blank#}2{#/blank#} Questions about subject content are generally welcomed. Before asking questions about the course design, read the syllabus（教学大纲）and learning management system information to be sure the answer isn't hiding in plain sight.

    •Participate in discussion forums（论坛）， blogs and other open-ended forums for dialogue. {#blank#}3{#/blank#}Be sure to stay on topic and not offer irrelevant information. Make a point， and make it safe for others to do the same.

    Don'ts

    •Don't share personal information or stories. Professors are not trained nurses, financial aid experts or your best friends. If you are in need of a deadline extension, simply explain the situation to the professor. {#blank#}4{#/blank#}

    •Don't openly express annoyance at a professor or class. {#blank#}5{#/blank#} When a student attacks a professor on the social media，the language used actually says more about the student. If there is truly a concern about a professor's professionalism or ability, be sure to use online course evaluations to calmly offer your comments.

A. If more information is needed, they will ask.

B. Below are some common do's and don'ts for online learners.

C. That's what they are for.

D. Ask questions, but make sure they are good, thoughtful questions.

E. Everyone has taken a not-so-great class at one time or another.

F. Turn to an online instructor for help.

G. Remember that online professors get a lot of emails.

    Is our planet heating up? Are human beings to blame for climate change? {#blank#}1{#/blank#} The discussion on this subject has been heated, but what are scientists actually saying? At Reader's Digest, we decided to find it out.

    {#blank#}2{#/blank#}

    Yes, it has, and even warmer. Greenland was forested between 450,000 and 800,000 years ago, so temperatures were considerably warmer then. There have also been other times of relatively high temperatures.

    So why does the concern exist?

    It's all about the speed at which temperatures are changing. {#blank#}3{#/blank#} But in the 20th and 21^st centuries, especially since 1976, temperatures have probably risen more quickly than during any century in the past 1 ,000 years. Warming may bring improved crop production and other benefits to northern countries such as Canada or Russia. However, many species may not adapt to these conditions, and the one that is able to may cause a problem. {#blank#}4{#/blank#} The West Nile virus, first seen in North America nine years ago, infected about 4,000 people in the US in 2006. The mountain pine beetle, which is active during warmer winters, has already destroyed about 13 million hectares of Canada's forests, worth an estimated $6. 4 billion.

    What is causing the warming?

    IPCC has concluded that human activity is very likely responsible, by increasing the concentrations of greenhouse gases and thus the greenhouse effect. {#blank#}5{#/blank#} They argue the human contribution is nothing.

A. Some scientists, however, still disagree.

B. Has the planet ever been this warm before?

C. Has human behavior made the planet warm?

D. Temperatures have been changing all the time.

E. In the past, temperatures moved up or down gradually.

F. Mosquitoes have been moving northwards to higher places.

G. These questions have burst into newspapers, films and popular books.

Be a Green Child

What does it mean to be green? "Green" is more than just a color. It also means taking special steps to protect the environment. Why green? Plants are green, and without them the Earth wouldn't be such a lovely home for us human beings. What can we do? {#blank#}1{#/blank#}

Reduce It!

{#blank#}2{#/blank#} For instance, a shorter shower means you use less water and less fuel since your house uses fuel to run the heater that warms up the water.

Reuse It!

Sometimes people call ours a "throwaway society". It means that we're always throwing away old stuff (东西) and buying new stuff. {#blank#}3{#/blank#} For instance, if your baby brother becomes older and loses interest in his plastic basketball hoop (篮圈), why not give it to another family who has a little kid?

Recycle It!

Recycling has never been easier. Many communities will pick it up right in front of your house and some towns even require it. Recycled goods go to a recycling center, where they can be turned into new cans, bottles, and paper.

Enjoy It!

It's true that rubbish and pollution are problems, but the Earth remains a huge and beautiful place that's ready for you to explore. {#blank#}4{#/blank#} Go for a hike, visit local nature centers and gardens, and climb up mountains.

But before you travel the globe, take a look at your own backyard. Is there a spot where you could plant a tree or put in a little fruit or vegetable garden? {#blank#}5{#/blank#}

A. Here's a four­step guide to being green.

B. Many times, even if you no longer need something, someone else just might.

C. You can start locally by visiting the naturally beautiful spots in your city.

D. Turn off the tap when you're brushing your teeth.

E. Get out there and get your hands dirty.

F. You can watch with pride as your tree takes root and your garden plants grow.

G. When you use less of something, you do a good thing for the Earth.