2 . Running is often tiring and a lot of hard work, but nothing beats the feeling you get after finishing a long workout around the track.

But while it’s long been believed that endorphins (内啡肽) —chemicals in the body that cause happiness—are behind the so-called “runner’s high”, a study suggested that there may be more to this phenomenon than we previously knew.

According to a recent study published by a group of scientists from several German universities, a group of chemicals called endocannabinoids (内源性大麻素) may actually be responsible for this familiar great feeling.

To test this theory, the scientists turned to mice. Both mice and humans release high levels of endorphins and endocannabinoids after exercise. After exercising on running wheels, the mice seemed happy and relaxed and displayed no signs of anxiety. But after being given a drug to block their endorphins, the mice’s behavior didn’t seem to change. However, when their endocannabinoids were blocked with a different drug, their runners’ high symptoms seemed to fade.

“The long-held notion of endorphins being responsible for the runner’s high is false. Endorphins are effective pain relievers, but only when it comes to the pain in your body and muscles you feel after working out,” Patrick Lucas Austin wrote on science blog Lifchacker.

Similar studies are yet to be carried out on humans, but it’s already known that exercise is a highly effective way to get rid of stress or anxiety. The UK’s National Health Service even prescribes (开药 方) exercise to patients who are suffering from depression. “Being depressed can leave you feeling low in energy, which might put you off being more active. Regular exercise can improve your mood if you have depression, and its especially useful for people with mild to moderate (中等的) depression,” it wrote on its website.

It seems like nothing can beat that feeling we get after a good workout, even if we don’t fully understand where it comes from. At least if we’re feeling down, we know that all we have to do is to put on our running shoes.

3 . Walking has been considered as one of the best possible exercises. For many people, daily walking offers massive and long-term physical and mental benefits.     1     A Stanford University study found that participants were more creative when walking as opposed to sitting.

    2     You’ve probably heard the phrase “exercise your creativity”. Our creative mindset is triggered by physical movement, which is exactly why walking with your dog, a friend, or alone feeds creative thinking.

But the scenery is almost as important as the sweat. Just by going outside, you are stepping out of your habitual surroundings and your comfort zone, which is necessary if you want to open your mind to new possibilities. You can walk through a tree-filled neighborhood.     3     Even when you walk down a busy street, you can’t help but get distracted by the sweet smells from a food cart or the child pointing to a building you haven’t even noticed before.

Walking outside cultivates our ability to collect new ideas and take in new sights, sounds, smells, and flavors. Shinrin-yoku, a common form of relaxation in Japan, suggests that being in the forest and walking among the trees there can lower your stress levels.     4     Research has shown that immersion in nature around your neighborhood or the disconnection from multimedia increased performance on a creative problem-solving task.

So instead of setting a fitness goal, why not set a creativity goal that starts with walking outdoors?     5     For example, you can turn off your phone and give yourself the chance to be present in the world, to hear conversations and natural sounds, and to notice the way people move and the way the sun reflects in a lake.

Walk not just for exercise. Walk for wonder.

Hangzhou, along with five other cities in Zhejiang province,     1     (be) ready to host a smart and safe Asian Games, which will officially open on Saturday, said Chen Weiqiang, chief spokesman for the Hangzhou Asian Games     2     the Hangzhou Asian Para Games.

“The Hangzhou Asian Games the     3     (three) Asiad to be hosted in China—is an Asian Games held in the new era. Many high-tech applications have been set up     4     (provide) a smart and safe Games,” said Chen,     5     is also executive secretary-general of the Hangzhou Asian Games Organizing Committee.

“So far we     6     (overcome) a lot of challenges and are now fully equipped to     7     (success) hold the Games. All     8     (compete) equipment and support and operations teams are in place,” he added.

The digital torch relay was held on June 15, in sync (同步) with the physical one. More than 100million people online, who passed on the torch by shaking their mobile phones, had joined     10     the digital relay on Wednesday.

5 . It was the final part of the 2016 World Triathlon (铁人三项) Series in Mexico. With just 700 meters to go, Alistair in third place and his younger brother, Jonny, was in the ________. Alistair pushed himself towards the finish line in the________heat, but as he came round the corner, he saw his brother about to ________onto the track. Alistair had to choose-- brotherly love or a chance to ________the race?

For Alistair, the choice was clear. His brother was ________. He had to help. Alistair ran towards Jonny, caught him and started pulling him towards the finish line. Alistair then________ his brother over the line. The move put Jonny in second place and Alistair himself in third. It was an________ end to the race, but Alistair did not want to discuss it with the media. He just wanted to see his younger brother, who had been________ to the medical area.

The brothers have been doing triathlons since they were children.“________, when your older brother is doing it, you think it’s a cool thing to do.” says Jonny. Alistair says that they________ each other as much as they can when they train. Despite________over “stupid things” now and then, Alistair agrees that having a brother is an advantage. “Throughout my entire life, I’ve had my brother trying to beat me at everything I do. It has been an hugely________force.”

Watched by millions, the ending to the race has ________ opinions: should the brothers have been disqualified (使丧失资格) or highly ________ for their actions? But for Alistair, his decision was easy to explain:“Mum wouldn’t have been happy if I’d left Jonny behind.”At that moment, he was no longer an athlete aiming for a medal -- he was just a ________.

Yours,

Li Hua