It was the day of the big cross-country run. Students from seven different primary schools in and around the small town were warming up and walking the route(路线)through thick evergreen forest.

I looked around and finally spotted David, who was standing by himself off to the side by a fence. He was small for ten years old. His usual big toothy smile was absent today. I walked over and asked him why he wasn’t with the other children. He hesitated and then said he had decided not to run.

What was wrong? He had worked so hard for this event!

I quickly searched the crowd for the school’s coach and asked him what had happened. “I was afraid that kids from other schools would laugh at him,” he explained uncomfortably. “I gave him the choice to run or not, and let him decide.”

I bit back my frustration(懊恼). I knew the coach meant well—he thought he was doing the right thing. After making sure that David could run if he wanted, I turned to find him coming towards me, his small body rocking from side to side as he swung his feet forward.

David had a brain disease which prevented him from walking or running like other children, but at school his classmates thought of him as a regular kid. He always participated to the best of his ability in whatever they were doing. That was why none of the children thought it unusual that David had decided to join the cross-country team. It just took him longer—that’s all. David had not missed a single practice, and although he always finished his run long after the other children, he did always finish. As a special education teacher at the school, I was familiar with the challenges David faced and was proud of his strong determination.

The Chinese government recently finalized a plan to set up a Giant Panda National Park(GPNP).     1     (cover)an area about three times     2     size of Yellowstone National Park, the GPNP will be one of the first national parks in the country. The plan will extend protection to a significant number of areas that     3     (be)previously unprotected, bringing many of the existing protected areas for giant pandas under one authority     4     (increase)effectiveness and reduce inconsistencies in management.

After a three-year pilot period, the GPNP will be officially set up next year. The GPNP     5     (design)to reflect the guiding principle of “protecting the authenticity and integrity(完整性)of natural ecosystems, preserving biological diversity, protecting ecological buffer zones,     6     leaving behind precious natural assets(资产)for future generations”. The GPNP’s main goal is to improve connectivity between separate     7     (population)and homes of giant pandas, and     8     (eventual)achieve a desired level of population in the wild.

Giant pandas also serve     9     an umbrella species(物种), bringing protection to a host of plants and animals in the southwestern and northwestern parts of China. The GPNP is intended to provide stronger protection for all the species     10     live within the Giant Panda Range and significantly improve the health of the ecosystem in the area.

3 . My husband, our children and I have had wonderful camping experiences over the past ten years.

Some of our _______ are funny, especially from the early years when our children were little. Once, we _______ along Chalk Creek. I was _______ that our 15-month-old boy would fall into the creek (小溪). I tied a rope around his waist to keep him near to our spot. That lasted about ten minutes. He was _______, and his crying let the whole campground know it. So _______ tying him up, I just kept a close eye on him. It _______ — he didn’t end up in the creek. My three-year-old, however, did.

Another time, we rented a boat in Vallecito Lake. The sky was clear when we _______, but storms move in fast in the mountains, and this one quickly _______ our peaceful morning trip. The _______ picked up and thunder rolled. My husband stopped fishing to ____________ the motor. Nothing. He tried again. No ____________. We were stuck in the middle of the lake with a dead motor. As we all sat there ____________, a fisherman pulled up, threw us a rope and towed (拖) us back. We were ____________.

Now, every year when my husband pulls our camper out of the garage, we are filled with a sense of ____________, wondering what camping fun and ____________ we will experience next.

4 . Fitness Magazine recently ran an article titled “Five Reasons to Thank Your Workout Partner.” One reason was: “You’ll actually show up if you know someone is waiting for you at the gym, ” while another read: “    1    ”   With a workout partner, you will increase your training effort as there is a subtle (微妙) competition.

So, how do you find a workout partner?

First of all, decide what you want from that person.     2     Or do you just want to be physically fit, able to move with strength and flexibility? Think about the exercises you would like to do with your workout partner.

You might think about posting what you are looking for on social media, but it probably won’t result in a useful response.     3     If you plan on working out in a gym, that person must belong to the same gym.

My partner posted her request on the notice board of a local park. Her notice included what kind of training she wanted to do, how many days a week and how many hours she wanted to spend on each session, and her age. It also listed her favorite sports and activities, and provided her phone number.     4    

You and your partner will probably have different skills.     5     Over time, both of you will benefit—your partner will be able to lift more weights and you will become more physically fit. The core (核心) of your relationship is that you will always be there to help each other.

5 . The elderly residents (居民) in care homes in London are being given hens to look after to stop them feeling lonely.

The project was dreamed up by a local charity (慈善组织) to reduce loneliness and improve elderly people’s wellbeing. It is also being used to help patients suffering dementia, a serious illness of the mind. Staff in care homes have reported a reduction in the use of medicine where hens are in use.

Among those taking part in the project is 80-year-old Ruth Xavier. She said: “I used to keep hens when I was younger and had to prepare their breakfast each morning before I went to school. ”

“I like the project a lot. I am down there in my wheelchair in the morning letting the hens out and down there again at night to see they’ve gone to bed.”

“It’s good to have a different focus. People have been bringing their children in to see the hens and residents come and sit outside to watch them. I’m enjoying the creative activities, and it feels great to have done something useful.”

There are now 700 elderly people looking after hens in 20 care homes in the North East, and the charity has been given financial support to roll it out countrywide.

Wendy Wilson, extra care manager at 60 Penfold Street, one of the first to embark on the project, said: “Residents really welcome the idea of the project and the creative sessions. We are looking forward to the benefits and fun the project can bring to people here.”

Lynn Lewis, director of Notting Hill Pathways, said: “We are happy to be taking part in the project. It will really help connect our residents through a shared interest and creative activities.”

6 . Human speech contains more than 2,000 different sounds, from the common “m” and “a” to the rare clicks of some southern African languages. But why are certain sounds more common than others? A ground-breaking, five-year study shows that diet-related changes in human bite led to new speech sounds that are now found in half the world’s languages.

More than 30 years ago, the scholar Charles Hockett noted that speech sounds called labiodentals, such as “f” and “v”, were more common in the languages of societies that ate softer foods. Now a team of researchers led by Damián Blasi at the University of Zurich, Switzerland, has found how and why this trend arose.

They discovered that the upper and lower front teeth of ancient human adults were aligned (对齐), making it hard to produce labiodentals, which are formed by touching the lower lip to the upper teeth. Later, our jaws changed to an overbite structure (结构), making it easier to produce such sounds.

The team showed that this change in bite was connected with the development of agriculture in the Neolithic period. Food became easier to chew at this point. The jawbone didn’t have to do as much work and so didn’t grow to be so large.

Analyses of a language database also confirmed that there was a global change in the sound of world languages after the Neolithic age, with the use of “f” and “v” increasing remarkably during the last few thousand years. These sounds are still not found in the languages of many hunter-gatherer people today.

This research overturns the popular view that all human speech sounds were present when human beings evolved around 300,000 years ago. “The set of speech sounds we use has not necessarily remained stable since the appearance of human beings, but rather the huge variety of speech sounds that we find today is the product of a complex interplay of things like biological change and cultural evolution,” said Steven Moran, a member of the research team.

7 . Like most of us, I try to be mindful of food that goes to waste. The arugula (芝麻菜)was to make a nice green salad, rounding out a roast chicken dinner. But I ended up working late. Then friends called with a dinner invitation. I stuck the chicken in the freezer. But as days passed, the arugula went bad. Even worse, I had unthinkingly bought way too much; I could have made six salads with what I threw out.

In a world where nearly 800 million people a year go hungry, “food waste goes against the moral grain,” as Elizabeth Royte writes in this month’s cover story. It’s jaw-dropping how much perfectly good food is thrown away — from “ugly” (but quite eatable) vegetables rejected by grocers to large amounts of uneaten dishes thrown into restaurant garbage cans.

Producing food that no one eats wastes the water, fuel, and other resources used to grow it. That makes food waste an environmental problem. In fact, Royte writes, “if food waste were a country, it would be the third largest producer of greenhouse gases in the world.”

If that’s hard to understand, let’s keep it as simple as the arugula at the back of my refrigerator. Mike Curtin sees my arugula story all the time — but for him, it's more like 12 bones of donated strawberries nearing their last days. Curtin is CEO of DC Central Kitchen in Washington, D.C., which recovers food and turns it into healthy meals. Last year it recovered more than 807,500 pounds of food by taking donations and collecting blemished (有瑕疵的) produce that otherwise would have rotted in fields. And the strawberries? Volunteers will wash, cut, and freeze or dry them for use in meals down the road.

Such methods seem obvious, yet so often we just don’t think. “Everyone can play a part in reducing waste, whether by not purchasing more food than necessary in your weekly shopping or by asking restaurants to not include the side dish you won’t eat,” Curtin says.

8 . Grading Policies for Introduction to Literature

90-100, A; 80-89, B; 70-79, C; 60-69, D; Below 60, E.

Your four major essays will combine to form the main part of the grade for this course: Essay 1 = 10%; Essay 2 = 15%; Essay 3 = 15%; Essay 4 = 20%.

Students will work in groups to complete four assignments (作业) during the course. All the assignments will be submitted by the assigned date through Blackboard, our online learning and course management system.

Class activities will vary from day to day, but students must be ready to complete short in-class writings or tests drawn directly from assigned readings or notes from the previous class' lecture/discussion, so it is important to take careful notes during class. Additionally, from time to time I will assign group work to be completed in class or short assignments to be completed at home, both of which will be graded.

An essay not submitted in class on the due date will lose a letter grade for each class period it is late. If it is not turned in by the 4th day after the due date, it will earn a zero. Daily assignments not completed during class will get a zero. Short writings missed as a result of an excused absence will be accepted.

10 . Can a small group of drones (无人机) guarantee the safety and reliability of railways and, at the same time, help railway operators save billions of euros each year? That is the very likely future of applying today’s “eyes in the sky” technology to make sure that the millions of kilometres of rail tracks and infrastructure (基础设施) worldwide are safe for trains on a 24/7 basis.

Drones are already being used to examine high-tension electrical lines. They could do precisely the same thing to inspect railway lines and other vital aspects of rail infrastructure such as the correct position of railway tracks and switching points. The more regularly they can be inspected, the more railway safety, reliability and on-time performance will be improved. Costs would be cut and operations would be more efficient (高效) across the board.

That includes huge savings in maintenance costs and better protection of railway personnel safety. It is calculated that European railways alone spend approximately 20 billion euros a year on maintenance, including sending maintenance staff, often at night, to inspect and repair the rail infrastructure. That can be dangerous work that could be avoided with drones assisting the crews’ efforts.

By using the latest technologies, drones could also start providing higher-value services for railways, detecting faults in the rail or switches, before they can cause any safety problems. To perform these tasks, drones for rail don’t need to be flying overhead. Engineers are now working on a new concept: the rail drones of the future. They will be moving on the track ahead of the train, and programmed to run autonomously. Very small drones with advanced sensors and AI and travelling ahead of the train could guide it like a co-pilot. With their ability to see ahead, they could signal any problem, so that fast-moving trains would be able to react in time.