2 . This question has fascinated behavioural scientists for decades: why do we give money to charity?

The explanations for charitable giving fall into three broad categories, from the purely altruisic (利他的)— I donate because I value the social good done by the charity. The “impurely” altruistic— I donate because I extract value from knowing I contribute to the social good for the charity. And the not-at-all altruistic— I donate because I want to show off to potential mates how rich I am.

But are these motives strong enough to enable people to donate as much as they would want to? Most people support charities in one way or another, but often we struggle to make donations as often as we think we should. Although many people would like to leave a gift to charity in their will, they forget about it when the time comes.

Many people are also aware that they should donate to the causes that have the highest impact, but facts and figures are less attractive than narratives. In a series of experiments, it was found that people are much more responsive to charitable pleas that feature a single, identifiable beneficiary(受益者), than they are to statistical information about the scale of the problem being faced. When it comes to charitable giving, we are often ruled by our hearts and not our heads.

The good news is that charitable giving is contagious—seeing others give makes an individual more likely to give and gentle encouragement from an important person in your life can also make a big difference to your donation decisions— more than quadrupling them in our recent study. Habit also plays a part— in three recent experiments those who volunteered before were more likely to do donate their time than those who had not volunteered before.

In summary, behavioural science identifies a range of factors that influence our donations, and can help us to keep giving in the longer term. This is great news not just for charities, but also for donors.

4 . California has been using recycled wastewater for many years. A team has used it to make ice surfaces for the game of hockey(冰球运动). It has been used to make snow for the sport of skiing. And farmers use it to water their crops. But it has not been used directly for drinking water.

Recently, California officials approved new rules to let water agencies recycle wastewater and put it right back into the pipes that carry drinking water to homes, schools, and businesses. It is a big step for California.

California’s new rules would let—but not require—water agencies to take wastewater, treat it, and then put it right back into the drinking water system. That means proving to people that recycled water is not only safe to drink but also not dirty. California would be just the second US state to permit this, following Colorado. It has taken officials more than 10 years to develop these rules, a process that included several studies by independent groups of scientists.

A project in San Diego is aiming to produce nearly half of the city’s water through recycling wastewater by 2035. And the Metropolitan Water District of Southern California aims to produce up to nearly 570 million liters(升)a day for its 19 million people. Adel Hagekhalil is with Metropolitan Water. He said the new rules will permit new projects that have not yet been considered.

California’s new rules require the wastewater be treated for all bacteria and viruses, even if they are not present in the wastewater. In fact, the treatment is so intense that it removes all of the minerals that make fresh drinking water taste good. That means the minerals need to be added back at the end of the process. Polhemus is a director of the drinking water group for the California Water Resources Control Board. “It’s at the same drinking water quality, and probably better in many instances,” he said, adding that it takes time and money to build these treatment centers. So, they will only be available for bigger cities at first.

5 . Templer was a tour guide in Zimbabwe, leading a canoe (皮划艇) safari down the Zambezi River. During the expedition, Templer’s canoe _______ the way, with the other two canoes to follow.

Things were going the way they were supposed to go. Everyone was having a pretty good time. Eventually, they _______ a dozen hippos, which were territorial animals. That’s not _______ on the Zambezi, Africa’s fourth-longest river. They weren’t alarmed at first as they were at a safe _______.

Templer tried to steer (率领) the group safely around them. However, the third canoe was off the planned _______ and was attacked by an aggressive hippo. The guide named Evans on the canoe fell into the water. Templer went to _______ him. He was getting closer to Evans. He was _______— it was kind of a made-for-Hollywood movie — Evans was reaching up. Their _______ almost touched. And then the water between them just _______. Before he knew it, Templer was up to his waist down a hippo’s throat. His legs were trapped but his hands were ________. So he tried to hold onto the hippo’s tusks (长牙) to ________being torn apart. The hippo must have been uncomfortable because it spat him out. So he quickly burst to the ________, and breathed some fresh air. With others’ help, Templer and Evans made it out of the river.

Despite the unpleasant experience, Templer ________to work as a tour guide. He also became an advocate for hippo ________, recognizing that the animals were not inherently aggressive but were ________ defending their territory.

6 . One strategy for reducing food waste’s environmental impact seems contrary to common sense: Open more grocery stores. That’s according to new research from Elena Belavina, an expert in operations management and supply chains.

The food we throw out because it goes bad when cleaning out the fridge makes a surprisingly large contribution to global warming. One-third of all food produced is wasted, a problem responsible for carbon emissions (排放物) equivalent to all road transportation, said Belavina.

When consumers can purchase food nearby, they shop more often but buy less each time, ultimately wasting less. “The more stores you have, the lower food waste is going to be,” said Belavina. “Very small increases in store density (密度) can have a very high impact.”

Belavina found that in Chicago, which she said is typical of many American cities, adding just three or four markets within a 10-square-kilometer area would reduce food waste by 6% to 9%. That would achieve an emissions reduction comparable to converting (改装) more than 20,000 cars from petrol to electric power.

Most big cities are well below the ideal density of grocery stores that would minimize food waste, the research determined. In Chicago, that would be about 200 markets within a 10-square-kilometer area — compared to 15 currently — but most of the benefit from reduced emissions would be achieved by about 50 markets. New York City, with its abundance of produce stands and neighborhood markets, comes closest to its ideal density.

Urban planners, city governments and activists should pursue policies encouraging an ideal density of grocery stores based on each city’s population, she said. Chain stores’ sustainability plans should analyze how their store networks and supply chains contribute to food waste and emissions overall.

“We actually see some moves toward going a little bit back in time and those small corner stores and mom-and-pop stores are making a comeback,” she said.

7 . Everywhere I look, there are new buildings under construction. The neighborhoods that I knew as a boy, filled with beautiful old buildings, have mostly disappeared, and in their place, modern, high-rise buildings have appeared. There is good reason for this. Residents want all the conveniences of modern living. However, how can our children understand and maintain their cultural identity if we erase so much of the physical evidence of it?

The arguments for preserving historic buildings are not simply about an emotional attachment to the past. There are also good economic arguments in favour of preservation. The renovation (修缮) and preservation of historic districts can become an economic engine, drawing tourists and small businesses to the area. For example, in Dubai, the historic Al Bastikiya district draws thousands of tourists every year from all over the world. It also attracts local residents, eager to learn about their city's past.

Some have argued that historic preservation is too expensive, but many recent projects have demonstrated that this is not necessarily the case. In fact, renovation of an existing structure for adaptive reuse can cost about £40 per square metre less than even the most basic new construction, while preserving the beauty of the original building. And, although it is often claimed that old buildings have a more significant environmental footprint than new construction because they aren’t very energy efficient, architects and environmental experts maintain that the greenest building is the one that is already built. New construction almost always has a more serious environmental impact (影响) because it requires the use of all-new materials that must be transported, often over long distances, instead of recycled materials that are already on site. We recycle so many other things. We can and should recycle buildings, too.

Historic preservation is an option that opens many possibilities; demolition (拆毁), in contrast, is irreversible. Once these treasures are lost, they are lost forever, an important link in our heritage that can never be recovered.

8 . ByteDance’s Douyin has been trialing a food delivery service since December as it looks to expand its business beyond advertising. It potentially competes itself against major e-commerce companies like Alibaba and Meituan. And the company is now considering extending the service beyond the trial.

A Douyin spokesperson says that the company has been “testing a feature in Beijing, Shanghai and Chengdu that enables merchants (商人) to promote and sell ‘group-buying’ packages to Douyin users in these select cities and have them delivered”. Restaurant owners often livestream on Douyin to market their business. While doing this, they can offer discounts and coupons (优惠券) for their food to users watching the videos. Multiple users can then purchase that offer mainly and choose a time within two days for the food to arrive. The model is very different from Meituan and Alibaba’s Ele.me which are both on-demand food delivery services.

The digital giant has approached restaurant owners and food enterprises in the three cities to promote their dishes on the app. Douyin states that the success of the trial run will determine whether the in-app meal delivery service will be expanded to other cities. “We would consider expanding the feature to more cities in the future depending on the testing results. There is no detailed timeline yet,” a Douyin spokesperson says.

China’s food delivery industry is dominated by Meituan and Ele.me. Douyin has fewer food buying options than Meituan and Ele.me. But ByteDance’s tentative (暂定的) steps into the market suggest it wants a slice of the market. Major e-commerce platforms are getting into the food delivery business.

One Weibo post reads, “More platforms could be advantageous for both food business owners and regular consumers.” Users think the competition will help registered vendors (销售商) and users because customers will have more options and food business owners can use the platform that charges the lowest service fee.

African students who participated in a Chinese agricultural development program have returned to their home countries, aiming to use     1     they’ve learned to help local farmers increase grain yields.

In the Science and Technology Backyard program, which     2     (launch) in 2009 at China Agricultural University in Beijing, students conducted research in experimental fields in rural areas while using their     3     (acquire) knowledge to help Chinese farmers. Phiri, one student from Malawi in Africa, expected hopefully, “We are well on our way to establishing successful STBs,     4     purpose is to empower the farmers of Malawi with the knowledge and tools they need     5     (shape) their agricultural futures.” Due to poor soil quality and a lack of modern agricultural technologies, the yield for Malawi’s main crop, maize, is     6     (relative) low. Many farmers are not growing enough food to sustain     7     (they).

Phiri and other African students, together with their teachers often engaged in conversations with farmers in the fields. Jiao Xiaoqiang,     8     associate professor in charge of the program, said such     9     (engage) is very necessary. “The core of the project lies     10     bringing technicians and farmers together. Only by truly participating in this process and understanding how to spread technology to farmers can they make a real impact when they return to Africa.”

East Buy, a subsidiary of Chinese private tutoring giant New Oriental, announced the     1    (remove) of Sun Dongxu from the positions of Executive Director and CEO on Saturday following a dispute involving popular live-streamer Dong Yuhui intensified this week,     2     has resulted in a significant drop in the company’s stock price.

New Oriental Chairman Yu Minhong will concurrently assume     3     position of CEO at East Buy. It represents a crucial step in New Oriental’s transformation into a live- streaming e-commerce company; however, during the past week, the dispute surrounding the company     4     (continue) to escalate (加剧).

It originated from East Buy staff     5     (respond) on social media, stating that the scripts used for live-broadcasts are collaboratively created by the hosts, copywriting team, filming team and editing team.

The reply has sparked discontent among the fans of the platform’s top-performing host Dong.

The former CEO’s subsequent response and apology not only failed to calm the storm     6     stirred up more frustration among netizens. In his response, Sun mentioned that Dong’s annual salary is more than     7     (ten) of millions of yuan and expressed a firm stance against the so-called “fan culture”.

The term “fan culture”     8     (rough) refers to an organized and spontaneous community of fans who support or promote their idols. Subsequently, Yu also publicly responded, acknowledging significant flaws in the company’s management and stating that the disclosure of Dong’s salary was     9     (appropriate). He also extended an apology to Dong for the situation.

On Saturday evening, Dong appeared in live-streaming together with Yu and confirmed his commitment     10     (stay) with East Buy. Yu announced that the company would soon initiate a major adjustment about the incomes of hosts, including Dong.