In China, the Citywalk trend is spreading from big cities to small cities, encouraging more participants and event organizers to get     1     (involve). Some organizers are working with folk culture researchers and enthusiasts to act     2     tour guides for their Citywalk experiences.

One such enthusiast     3     (explore) new possibilities in the tourism industry now is Xiao Yiyi, a young businessman from Changsha. Recently she     4     (launch) six Citywalk routes in different cities on her social media account, aiming to offer visitors     5    experience to “walk in open-air museums.”

Xiao Yiyi’s Citywalk route in Changsha includes more unusual     6     (sight) like 19^th-century historical architecture, artsy old alleys (小巷) and even a stop-off to sample the local spicy food.

Even though Citywalk is a     7     (relative) new concept, industry experts believe that     8     (it) potential is huge. It not only offers a way for young people to interact with a city in a meaningful way but also provides them with a new social scene     9     individuals with similar interests can connect and form friendship. At the same time, Citywalk represents an opportunity for tour guides and travel service providers to deliver services     10     (meet) with ever-changing market demands.

2 . Here are my top choices for the world’s best eco-hotels for holidays. A visit to any of these hotels promises a memorable and fulfilling vacation.

This small hotel is the exact picture of what it calls “old-school Bali”—a restful and laid-back experience in harmony with nature. Spend your days at Bambu Indah in natural river swimming pools fed by waterfalls, open-air bamboo structures on stilts (高跷) above the rice fields.

Why Book:

● There are only oil lamps in the hotel in an effort to reduce light pollution.

● Mosquito nets around beds catch cool air as part of a cooling solution that avoids traditional air conditioning and lessens the carbon footprint.

● Banana leaves are used as plates and papaya stems as straws as part of the hotel’s no-plastic policy.

The Stanford Inn paints a picture of wellness that extends beyond diet and exercise. Private classes and scissions in nutrition and healthy living are provided and a large greenhouse houses a saltwater swimming pool for year-round use.

Why Book:

● The inn hosts students in its Environmental Leadership Field school, providing these students with 4- to 6-week explorations into sustainability.

● The property has been practicing organic farming for more than 30 years.

Just 90 minutes from Bangkok, within a rainforest, guests can enjoy the unspoiled beauty and beaches of Soneye Kiri. Night diving and dining in a mushroom cave are just a couple of the unforgettable activities on offer.

Why Book:

● A 2% environmental tax on all stays goes toward the Soneva Foundation, which invests in various projects.

● Soneva funds the organization Care for Children, which has opened a foster care (寄养) training and resource center in Thailand.

● Partnerships with NGOs and other organizations help protect local marine life.

3 . Scientists in Brazil have developed a vaccine (疫苗) that prevents addicts from feeling pleasure from the illegal drug, cocaine (可卡因), making the addiction stop right away.

The vaccine, Calixcoca, works by stimulating the user’s immune system to produce antibodies (抗体) when cocaine is detected in the body. These antibodies attach themselves to cocaine in the blood, making it physically too large to pass into the brain’s reward system, where it can make the user feel pleasure.

Different from the failed U. S. vaccine, Calixcoca uses artificial components produced in a lab rather than natural ones, which makes it cheaper to produce and easier to store since the vaccine does not need to be stored at low temperatures.

Calixcoca has so far proven effective in testing on animals, producing significant levels of antibodies against cocaine and few side effects. It also protected unborn baby rats against cocaine, researchers found, suggesting it could be used in humans to protect the unborn babies from being damaged by their mother’s addiction. It is hoped that the introduction of such vaccines will be a significant tool in preventing deaths from cocaine use.

The vaccine is now set to enter the final stage of trials: testing on humans. The first tests on humans have had a 72% success rate in clinical settings. Given that the current treatment for cocaine addiction is only effective in 20% of patients, “anything that is more than 20% effective is already a lot,” said Garcia, a mental health doctor. He also emphasized that, while the vaccine shows promising results, it won’t be a cure-all for everyone. It targets people struggling with addiction, especially “those who are just off cocaine and want to stay that way”. Ideally, it would be used for patients during important phases of their recovery, like when they leave the drug addiction treatment centre.

The boat was on the inside of the huge whirlpool and we were going round in circles at great speed. I saw clearly that there were other objects in the whirlpool — trees and barrels. After a while, I became curious about the whirlpool itself. I then made three important observations. The first, the larger the bodies were, the more rapidly they fell; the second, between two objects of equal extent, spheres — round objects — fell down less rapidly; and the third, between two objects of the same size, cylinders — objects shaped like a tube-fell down more slowly. Although I didn’t know why it was so, I tied myself to a barrel to help me float. I tried to make my brother understand, but he was too frightened and stayed in the heavy boat. Without waiting, I jumped into the sea to try and escape.

Since my escape, I have had several conversations with an old physics teacher; and it was from him that I learned the use of the words “cylinder” and “sphere”. He explained to me the reasons for what I observed, although I have forgotten the explanation. He even showed me how it happened that a cylinder, swimming in a vortex (漩涡), was drawn in with greater difficulty than an equally big body, of any form whatever.

10 . Do Animals Have Friends?

When you see little animals playing together around a tree, or a cat and dog sleeping together in the living room, do you ever think — are they friends? One expert, Mike, believes that many animals do have friends. If they’re in the same group, they greet one another, travel together, play together and even share food with each other.     1    

Playing together helps animals keep them close to the group. Wild dogs who don’t play much are more likely to leave the group on their own.     2     If an animal has a special friend, both friends benefit by having someone to watch out for them. In the case of a young rhino (犀牛) going on its first journey, it may look for an older travel friend.     3    

Sharing is another important part of friendship. For all animals, finding food is a matter of life and death. For some bats in Central and South America, if they don’t get a blood meal every three days, they die of hunger.     4     If a bat doesn’t find food, a full bat will throw up some blood from its stomach into the mouth of the hungry friend.

But sometimes members of a group also compete for food and mates, which can lead to fights. So making up after fights is a key skill. Sometimes after two male monkeys have a fight, they will sit apart, avoiding each other.     5     An older female monkey may need to step in to play peace-maker. She will walk up to one of them, kiss or touch him, then slowly walk toward the other. Then she sits close to the second male. Both start grooming (梳毛) her. When she leaves, they continue to groom each other, as if to say, “We’re cool now.”