Have you ever wondered when dogs first became “man's best friend” and the world's favourite pet? If you have then you're not alone. When and where dogs first began living side-side with humans are questions that have stirred hot debate among scientists. There are a few hard facts that all agree on. These include that dogs were once wolves and they were the first animal to be domesticated(驯养) by humans. They came into lives some 15000 years ago, before the dawn of agriculture.

    Beyond that, there is little agreement. The earliest bones found that are unquestionable dogs and not wolves date from 14,000 years ago. However, 30,000-year-old skulls have been discovered in France and Belgium that are not pure wolf and some scientists think could be dogs.

    With such puzzling evidence, many scientists are now turning to DNA to find out when and where dogs were first domesticated. In one research project, tens of thousands of blood samples have been taken from street dogs around the world. The plan is to compare them with those of wolves. It's even possible to analyse DNA from ancient bones. Tiny pieces of the 30,000-year-old skulls mentioned earlier are currently being studied, and another DNA study has already shown that ancient dogs preserved in the Alaskan ice-fields evolved from Asian wolves, not American ones.

    Indeed, the ancient DNA may turn out to be more informative than the DNA of living dogs. Because dogs have accompanied humans around the world for thousands of years, their current distribution may tell us very little of their origins. This is why different groups of scientists believe that dogs variously originated in eastern Asia, Mongolia, Siberia, Europe or Africa.

    But why were the animals domesticated in the first place? The most recent theory is that dogs domesticated themselves, initially living in and around our ancient villages to eat any food thrown out. Today, this is a way of life still shared by three -quarters of a billion unowned dogs worldwide.

    Here we list some cartoons that have continued up until now without an end, and among them there may be a favorite from your childhood:

Detective Conan

    Detective Conan has broadcasted since 1996 by V1 Studio in Japan. Now, it has 910 series without an end in sight. This cartoon makes many teenagers keen on detective stories. Although there are constant guesses about the ending of the cartoon, Detective Conan continues to update every week.

One Piece

    One Piece has been serialized since 1997. Until now, it has 784 series in total, and the number will continue grow in the future. This cartoon tells the story of a great adventurous journey among some hot-blooded youngster. Long may the journey continue…

Fairy Tail

    Fairy Tail has been serialized since 2009. It has a current total of 277 series. This cartoon tells the passionate story of teenagers in a magical world. Many people hope to achieve their magical dreams through such cartoons, creating an inspiration that lasts through to adulthood.

GINTAMA

    GINTAMA is a more recent cartoon released in 2006 April 4th, and it has serialized 329 sets in the past 11 years. It was introduced to China in 2014 July 10th.

Hell Girl

    Until now, Hell Girl has finished three seasons since its first season was serialized in 2005. This cartoon has 26 series each season, much less compared with other cartoons. According to the newest information, the fourth season of the cartoon is going to begin in July this year. The long-awaited return of Hell Girl will bring back a lot of memories for many people!

根据短文内容，选择最佳答案，并将选定答案的字母标号填在题前括号内。

    Robots that can chat, find misplaced glasses, draw airplanes and play with your children are attracting thousands of visitors during an expo in Tokyo as Japan adapts to changes in society.

    Robots, such as the sound-sensitive Chapit, answer simple questions and even joke with people to help the solitary fight loneliness and stay alert (机警的) in old age. "Many old people in Japan live alone and have no one to talk to," said Kazuya Kitamura, a representative of the expo organizer. "Communication robots stay together with old people and don't mind listening to the same stories over and over again."

    While Chapit, a relatively simple robot, managed to attract a partner, many researchers, such as Kiyoshi Matsumoto, a professor at the University of Tokyo, struggle to attract sponsors for more expensive projects.

    Matsumoto's "Personal Mobility Robot", equipped with four cameras and a sensor to recognize the user's centre of gravity, is designed to help the elderly move around without pressing buttons as in traditional wheelchairs.

    The robot can also help find misplaced glasses by recognizing them with a sensor. "We have developed a robot that can assist many people, but because of the high cost, we still haven't found a sponsor," said Matsumoto, who added that the cost of the machine, if produced in large quantities, would be comparable to that of a small car. "In the current economic environment there are few companies willing to invest (投资) in such a costly project," he said.

    Other robots, such as the award-winning "DiGRO", can support busy parents who have little time to play with their children. The robot can use the Internet to find a simple image and then draw pictures, looking after children while parents work.

    Japan is one of the world's fastest-aging countries and the government predicts that by 2050 the population of people over 65 will reach 40 percent.

    Two heads are better than one. After all, when trying to make decisions, it's good to have a second opinion. But what about a third, fourth — even twelfth? What group size is best for making decisions quickly? For ants, four to six heads surpass one and also outperform 12 or 24. That's what Sylvia Zamescu now reports.

    The 18-year-old senior at Catalina Foothills High School in Tucson, Arizona isn't generally into ants. She's interested in decision-making, especially by people. Last summer, Sylvia read that social insects such as ants and bees can be used to model decision-making. Ants, for example, forage for food. When an ant finds it, it takes a bite and heads back to the nest. On the way; the ant leaves a scented trail for other ants to pick up. Back at the nest, the ant vomits up its meal into the mouth of other ants. Those nest-mates then decide with the first ant whether the food is good enough to deserve a trip back for more. If it is, they follow the first ant's scented trail to lunch.

    When there are too few ants, it could take a long time for one ant to spread the word. If there are too many, it's hard to "tell" each about the find. What's the right number for foraging success? Sylvia decided to find out. She contacted professors at the University of Arizona in Tucson to look for someone who would let her study decision-making by ants in their lab. Professor Wulfila Gronenberg answered her email.

    Working with one of Wulfila's graduate students Sylvia set up an experiment. She tested the behavior of one, two, four, six, twelve and twenty-four ants. Each group was placed in a large box al taped "starting line". At the other end of the box were two bricks of sweetened gelatin (动物胶) one contained only 3 per cent sugar, and the other 30 per cent. Sylvia timed how long it took each group of ants to find the food. She also measured how much time they spent around each sweet treat.

    When there were just one or two ants, the discovery was slow. The same was true when she set twelve or twenty-four ants loose. But four to six ants? Perfect! These medium-size groups found the food forest. They also figured out quickly that the sweeter food was better.

    Similar work has been done on bighorn sheep, fish and fruit flies. "It may not be four to six animals, but it's the same principle," Sylvia says. A medium-size group "is optimal". So when faced with a new decision, two heads are better than one. But too many heads are too much. Like the ants, a good decision may just require a happy medium.

The science of setting goals.

It's the time of year when we think to ourselves:our New Year's resolutions will totally work out this time. {#blank#}1{#/blank#}. But what if this year really could be different? Kelly McGonigal, a psychologist, shares four tips. 

Choose a goal that matters, not just an easy win. Our brains love rewards, so we often set simple goals that make it easy to check off boxes. But if that's all are about, no wonder we end up abandoning them so quickly. A meaningful goal requires going deeper. {#blank#}2{#/blank#}. For example, if you want to quit eating junk food, ask why you want to quit it. Then, if you want to quit it for your health, ask why you want good health.

{#blank#}3{#/blank#}.When we set goals, it's easy to focus on that magical ending. But we can't control outcomes. We have to inch toward them, one choice at a time. Ask yourself, "What is the smallest thing I can do today that helps me reach my goal?" If you make daily choices that are consistent with your goal over and over again, you will eventually reach it. 

Frame your goals positively. Focusing on what you want to bring into your life –not what you want to avoid – will make you more likely to actually pursue it. "Any sort of avoidance is going to trigger inhibition systems, {#blank#}4{#/blank#}," says McGonigal.

Prepare for failure. Moments of failure are inevitable, but most of us abandon the goal entirely when minor failures and setbacks start piling up. Your task is not to avoid failures, but to plan for them. Ask yourself, "How am I likely to fail?" For example, if you‘re likely to choose unhealthy meals when you're hungry, carry a light snack that can tide you over. {#blank#}5{#/blank#}.

A. Focus on the process, not the outcome

B. Psychologists call this an emergency plan

C. It really drives home why that goal matters

D. Never mind that we abandoned them very quickly

E. How you describe your goal makes a big difference

F. Think about what you want, and then ask yourself why

G. But positive goals are going to trigger approach and reward motivation

A significant proportion of the American populace within the working-age demographic are encountering challenges in meeting the financial demands associated with health care, as per a recent comprehensive evaluation. This study, which is the inaugural edition of the Health Care Affordability Survey conducted by the Commonwealth Fund, reveals that a substantial 51 percent of adults falling within the age bracket of 19 to 64 years have expressed that affording health care for themselves and their family is either exceedingly challenging or moderately difficult. This observation encompasses 43 percent of individuals who are beneficiaries of health insurance provided by their employers and an even higher 57 percent who have secured health insurance through a marketplace or have opted for an individual plan.

Additionally, it is noteworthy that nearly one-half of the working-age adults who are under the Medicare program and 45 percent of those who are recipients of Medicaid also admit to facing hardships in covering their health care expenses. It is particularly striking that a majority, specifically 65 percent, of working-age adults have indicated that the escalation in the cost of various goods and services over the past year has had a detrimental impact on their capacity or that of their family to manage health care expenses.

The aforementioned survey, which is based on a sample that is representative of the nation and comprises nearly 7,900 individuals who are 19 years of age or older, was carried out from the mid-point of April through the month of July in the current year. This survey follows on the heels of another analysis conducted by the research entity known as KFF, which demonstrated an upward trend in the costs associated with health insurance for employer-sponsored plans as well as an increase in the contributions made by workers towards these plans in the year 2023.

The newly disseminated analysis has further unearthed that 38 percent of the individuals who participated in the survey identified cost as the primary factor that led them or a family member to either forgo or postpone the receipt of necessary health care services or the procurement of prescribed medication within the last 12 months. This includes 29 percent of those who are under the protection of employer-based coverage, 37 percent who are insured through individual and marketplace health plans, 42 percent who are covered by Medicare, and 39 percent who are recipients of Medicaid.

Furthermore, it is observed that more than six-tenths of the individuals who are devoid of any form of health insurance have reported that they or a family member have had to delay or forgo medical care due to financial constraints. Among all those who have reported such instances of skipping or delaying care, a considerable 57 percent have stated that a health issue has consequently deteriorated.