Today is a perfect day that can leave you with good memories you may someday share with your friends. Here's how:

    {#blank#}1{#/blank#} You can see or do something a million times, but you can only see or do it for the first time once. As a result, first time experiences usually leave a deep mark in our minds for the rest of our lives. So try to experience something different and you'll have more memories!

    Work on something that's great to you. {#blank#}2{#/blank#} Life is short. Today is the day to take action.

    Smile and notice what's right. Everything that happens in life is neither good nor bad.

    {#blank#}3{#/blank#} And no matter how it turns out, it always ends up just the way it should. Either you succeed or you learn something.

    Be true to yourself. The only shoes you can wear are your own. If you aren't being yourself, you aren't truly living. {#blank#}4{#/blank#}

    Make a new friend. People are interesting creatures (生物), and no two people are exactly alike. {#blank#}5{#/blank#} Find out what makes them different. They'll likely open your eyes to wonderful ideas. And you never know, they just might change your life.

    Be present.  Be here now. Remember, right now is the only dear moment to you.  Right now is life.  Don't miss it.

A. Learn a new skill.

B. Try something new.

C. It just depends on your opinion.

D. So meet someone new today.

E. And in fact, you're only existing.

F. Pay close attention to what you're doing.

G. Make yourself busy with something meaningful.

    Some educators told us that more years of school could help students get higher scores on intelligence tests. That was a finding of a study of teenage males in some countries. Now, another research shows that physical activity may help students do better in their classes.

    The research comes as educators in some countries are reducing time for activities like physical education. They are using the time instead for academic（学术的）subjects like math and reading. The studies appeared between 2008 and 2014. They included more than 55, 000 children, aged 6 to 18.

    Amika Singh:“ According to the results of our study, we can conclude that being physically active is beneficial for academic performance. There are, first, Physiological explanations, like more blood flow, and so more oxygen to the brain. Being physically active means there are more hormones(荷尔蒙)produced like endorphins(内啡肽). And endorphins make your stress level lower and your mood improved, which means you also perform better.”

    Also, students taking part in organized sports learn rules and how to follow them. This could improve their classroom behavior and help them keep their mind on their work.

    The study leaves some questions unanswered, however. Ms. Stash says it is not possible to say whether the amount or kind of activity affected the level of academic improvement. This is because of differences among the studies.

    The researchers said they found only two high-quality studies. They needed more high-quality studies to confirm (证实) their findings. They also pointed out that “results for other parts of the world may be quite different.”

    Still，the general finding was that physically active kids are more likely to do better in school. Ms. Singh says schools should consider that finding before they cut physical education programs. Her paper on “Physical Activity and Performance at School” is published in the Archives of Pediatric and Adolescent Medicine.

    Living in a modern society has its advantages and disadvantages. One disadvantage is that you often have to live closer to other people than you would like to. Sometimes, your neighbors make a noise that you are not comfortable with.

    The best way to solve this problem is to talk with your neighbor first. You should be very polite and ask your neighbor if he knows how thin the walls of your homes are. This way doesn't criticize (批评) his behavior; it simply points out that he may not realize how far his sound travels. Tell him that you know that sometimes you make noise as well, but that you do your best to keep it down. Often this will solve the problem right away, but sometimes the neighbor may become angry.

    If your neighbor becomes angry with you, there are some more steps you can take. You might write a letter to the neighborhood committee（居委会）. Make sure you write down the source of the noise and the time in the letter. They will review the situation and decide whether your neighbor is out of line. Some noise is considered to be reasonable, even if it bothers you. So you may prepare a good pair of earplugs (耳塞).

    Even if your neighbor makes too much noise, you don't have to live your life in discomfort. It's always a good idea to be friendly with your neighbors. You may clean the rubbish in front of his door. He's sure to appreciate behavior like this and be more open to your suggestions about noise level.

    The BeiDou Navigation Satellite System（BDS）is a Chinese satellite navigation system. It consists of two separate satellite constellations（星座）. The first BeiDou system, officially called the BeiDou Satellite Navigation Experimental System and also known as BeiDou-1, consists of three satellites, which since 2000 has offered limited coverage and navigation services, mainly for users in China and neighboring regions. Beidou-1 was decommissioned at the end of 2012.

    The second generation of the system, known as COMPASS or BeiDou-2, became operational in China in December 2011 with a partial constellation of 10 satellites in orbit. Since December 2012, it has been offering services to customers in the Asia-Pacific region.

    In 2015, China started the build-up of the third generation BeiDou system（BeiDou-3）in the global coverage constellation. The first BDS-3 satellite was launched on 30 March 2015. Up to January 2018, nine BeiDou-3 satellites have been launched. BeiDou-3 will eventually consist of 35 satellites and is expected to provide global services upon completion in 2020. So far, China has sent 27 BeiDou satellites into space. When fully completed, BeiDou, the world's fourth navigation satellite system, following GPS in the United States, GLONASS in Russia and Galileo in the European Union, will provide an alternative global navigation satellite system to the United States owned Global Positioning System（GPS）, and is expected to be more accurate than the GPS. It was claimed in 2016 that BeiDou-3 will reach millimeter-level accuracy（with post-processing）, which is ten times more accurate than the finest level of GPS.

    According to China Daily, in 2015, fifteen years after the satellite system was launched, it was generating a turnover of $31.5 billion annually for major companies such as China Aerospace Science and Industry Corp, AutoNavi Holdings Ltd, and China North Industries Group Corp.

The cane toad (海蟾蜍) was imported to Australia in 1935 to protect sugarcane crops. {#blank#}1{#/blank#} Experts estimate that there are currently over 200 million samples spread across Northern Australia, and the numbers are only growing. The increasing population is proving to be deadly for many native Australian animal species that hunt the toads as food. {#blank#}2{#/blank#}

    While some animals have learned to completely avoid the frogs, the Australian monitor lizards continue to be killed by them. The lizards that catch small animals love eating cane toads. {#blank#}3{#/blank#} It takes the cane toad less than 30 seconds to release enough poison to kill a lizard.

{#blank#}4{#/blank#} They decided to train the lizards to avoid the cane toads. To carry out the idea they went to a region of northwestern Australia that had not yet been invaded by cane toads and fed the wild lizards with young cane toads. Though the smaller animals release the same poison as the adults, they do so in smaller amounts. {#blank#}5{#/blank#} The researchers say it took just one or two tests to teach the lizards to stay away from cane toads. They continued to avoid the animals even when the larger cane toads arrived.

A. Not surprisingly, their population has dropped sharply.

B. Unfortunately, in most cases, it turns out to be their last meal.

C. With very few natural enemies, their population began to grow rapidly.

D. Now a team of researchers came up with a good plan to save the lizards.

E. Gradually, the lizards learned to eat only the mildly poisonous cane toads.

F. Therefore, while the poison does make the lizards sick, it does not kill them.

G. That's because cane toads release some deadly poison when they sense danger.

Yuan Longping, one of China's most famous{#blank#}1{#/blank#}（scientist）, works the land to do his research. He grows{#blank#}2{#/blank#} is called super hybrid rice, which makes{#blank#}3{#/blank#} possible to produce one﹣third more of the crop in the same fields.{#blank#}4{#/blank#} into a poor farmer's family in 1930, Dr Yuan graduated from Southwest Agricultural college in 1953. Since then, finding ways to grow more rice{#blank#}5{#/blank#}（be） his life goal. As a young man, he saw the great need{#blank#}6{#/blank#} increasing the rice output. He searched for a way to achieve it without{#blank#}7{#/blank#}（expand） the area of the fields. Thanks to his research, farmers are producing harvest twice as large as before and the UN has more tools in the battle{#blank#}8{#/blank#}（rid） the world of hunger.

One dream is not always enough,{#blank#}9{#/blank#}（especial） for a person who loves and cares for his people. Now Dr Yuan has another dream：to export his rice so that it can{#blank#}10{#/blank#}（grow） around the globe.