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I grew up with a four-year gap between myself and my younger brother. It was a distance (距离) in age to keep us close as we got older, but also an age gap to make sure we lived our own lives in completely different ways. Having a younger brother while I was a girl was a lot of work, for there was a lot of fighting. 

However, as we've got older, we've become closer, and I've learned several things in life from my younger brother that I didn't realize I needed before.

My younger brother is one of the most talented and creative souls (灵魂) I've known. He's continually feeding his creativity with new art forms and new instruments. He always seeks to understand and learn more about the world around him. He's helped remind me through his actions and words that giving up on creativity is something a person should never do.

My younger brother has also been through hard times, but he's able to focus on learning from the hard times, unlike me, who tends to hold on to every little thing from my life. It's always been difficult for me to let things go and move on, but my younger brother has been an inspiration (灵感来源) for me to try harder at letting go.

My younger brother has always been a more introverted type, and if you speak to him, you're lucky to get over three words out of him at a time. Because of this, he's certainly learned the whole "actions speak louder than words" thing. But, I've realized from my brother that I needn't speak to fill the silence. Sometimes, it's necessary to spend some of your time in silence and reflect in it.

Every day in the morning I make different sounds, starting with an "oomph" as I move to an upright position, then an "ahhh" as I swing my legs off the bed, followed by an "arrrrrrrgh" as I get to my feet. Then there's an "oh God" as I realize that my knees are unequal to the task they've been set.

My wife Jocasta believes in positive thinking. "All sighing and complaining will simply make you feel worse," she says. "If you act like a young gazelle (羚羊), then you'll feel like a young gazelle. "I'm guessing Jocasta doesn't know many young gazelles, at least not ones with aching knees and tired ankles. I then decide to follow her instructions, but to the power of ten.

I draw the curtains open, allowing sunlight to flood the room. "What a beautiful morning!" I say in a too-cheerful voice. "I'm planning a pot of Sri Lanka's finest tea for you. It is picked on the cool slopes of the country's mountainous central district and will be served with milk given by a diligent young cow. "

"Oh, God! Can you give it a rest?" says Jocasta. "Sure, your knee aches, but you can still get around. Pull your shoulders back, lift your head high, and highlight the positive. The science about positivity is that the body responds to signals sent by your brain. When you spend 23 hours a day sounding like a miserable old man, you'll turn into a miserable old man. "

I take a sip of tea before raising another case. "Yes," I say, "but the research published in the Scandinavian Journal of Pain shows that people can bear pain if allowed to swear. So," I continue, "when I limp off to work, yelling ‘Oh God, my knee', I'm just acting on the latest science. " This is replied with Jocasta's dark looks. "I'm not anti-swearing; I'm just anti-complaining. "

There's enough tea in the pot for a second cup. It is somehow more delicious for the way I imagine out loud where it is picked and how the milk is produced. The sunlight streaming in, I find myself humming a happy tune when a "horrific" thought hits me—Jocasta seems to have made it!

Americans often try to say things as quickly as possible. So, for some expressions, we use the first letters of the words instead of saving each word. Many common expressions or long names are shortened this way. 

B-Y-O-B is a short way of saying, "Bring Your Own Bottle. " The letters BYOB are often found at the bottom of a written invitation to a simple social, event or gathering of friends. For example, let's say I had a New Year's Eve party. I might include on the invitation. "Please come to my party and BYOB. " The bottle each person brings is what the person wants to drink at the party or wants to share.

However, an invitation to a special event -such as a wedding-would never say BYOB. An invitation to an official or very special event often has other letters written at the bottom. The letters are R-S-V-P. These letters represent the French expression "Repondez S'il Vous Plait. " In English the words mean "Respond If It Pleases You. " Americans use the letters as a short way to say, "Please answer this invitation. "

Another expression usually used for business and not parties is A-S-A-P. So, a colleague might say she needs something done ASAP. It means as soon as possible. She might also need something done by C-O-B. That means she wants to finish it by "Close Of Business" or the end of the work day.

Beginning letters are often used to represent the names of universities. A famous one is MIT. That is short for the Massachusetts Institute of Technology. Another major university is UCLA. Almost no one ever says its real name, the University of California at Los Angeles. That takes way too long!

Top Summer Math Programs for High School Students

Canada/USA Mathcamp

This summer program offers gifted high school students the chance to "live and breathe" mathematics. Throughout the program, students explore undergraduate- and graduate-level mathematical topics. They design their own curriculum by choosing their own classes and learn from professional mathematicians in the process. Mathcampers also get the opportunity to go hiking, whitewater rafting(漂流), rock climbing and much more.

Cost: $4,500 (Financial aid is available, and the program is free for families with household incomes under $65,000)

Location: Ohio State University

Ross Mathematics Program

The program focuses on one central mathematical concept—number theory. Participants spend the entire summer solving problem sets related to integers(整数)and their properties. This process provides a great foundation for students interested in conducting mathematical research in the future. 

Cost: $6,000(Financial aid is available)

Location: two campuses (Columbus, Ohio 8. Terre Haute, Indiana)

Program in Mathematics for Young Scientists (PROMYS)

For over three decades, PROMYS has been a place of mathematical exploration for talented high school students. Students in this program attend seminars on advanced mathematical topics. They also get the chance to participate in research projects under the guidance of professional mathematicians. 

Cost: $5,500 (Financial aid is available, and the program is free for US families with household incomes under $ 60,000)

Location: Boston University

Stanford University Math Camp (SUMaC)

Students in this program choose between two courses—algebraic topology(代数拓扑学)and abstract algebra &. number theory. Both to picsare major areas of modern mathematical research. In both courses, students engage in daily problem sets, work with Stanford graduate students and attend lectures from mathematicians. 

Cost: $3,250(Financial aid is available)

Location: online

假定你是李华，请给你给学校英语报投稿，介绍你班上周举办的乒乓球比赛。内容包括：1. 比赛目的及过程；2. 你的感受。

注意：1. 词数100左右；2. 可适当增加细节，以使行文连贯。

假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的以下作文。文中共有10处语言错误，每句中最多有两处。每处错误仅涉及一个单词的增加、删除或修改. 

增加：在缺词处加一个漏字符号（∧），并在其下面写出该加的词。删除：把多余的词用斜线（\）划掉。

修改：在错的词下画一横线，并在该词下面写出修改后的词。

注意：1. 每处错误及其修改均仅限一词；2. 只允许修改10处，多者（从第11处起）不计分。

During my summer vacation, I visited Xi'an but met a kind and caring guide, who left the deep impression on me. In the way, he told us a lot about this old city. Not only we know about the history of the city, but we were also invited to eat various special snack. Unfortunately, I got my left foot seriously injuring. It was terrible painful when I walked. Seeing that I have difficulty walking, he came to my assistance. Accompanied by him, I returned back to the bus to wait for other tourists. I was really grateful for her kindness.

"Exercise for an hour every day, and we can work happily for thirty years. " (similar), if we drink a little more water every day, we will be much (healthy). A healthy diet is made up of water and large number of different kinds of foods. We know that healthy foods like fruit, vegetables and fish (be) important as they provide us with energy and fiber, without giving us too much fat and sugar.

But why is water important? The human body needs water (survive). Water is important as it (carry) poisons and waste out of our bodies. Some doctors think water is important for our health  all kinds of ways. They believe a great many  (ill) and health problems are a result of a lack of water in the body. It is surprising to learn that  we feel thirsty, we are already in the first stage of dehydration (脱水). In fact, we (advise) to drink water before we feel thirsty by many doctors. 

阅读下面短文，从短文后各题所给的A、B、C和D四个选项中，选出可以填入空白处的最佳选项。

When I was quite young, I suffered from a serious digestive (消化的) disorder. I1  several doctors. Then, I 2  some blood test and it showed that I had coeliac disease, a medical condition in which the body cannot3  food that contains gluten (谷蛋白). I removed all gluten foods. I was advised to stop eating milk products from my 4  for six months. After making these dietary changes, my digestive health 5 . After seeing how food 6  my body and life, I developed a deep interest in7 . 

8 , I went to study nutrition at the College of Naturopathic Medicine (CNM). I was 9 by the practical learning methods suggested by the experienced teachers and the interesting10  given by them in class. In addition, the 11  in my class were from different countries and backgrounds. I was 12  by how generous everyone was in 13  their knowledge and experience with each other. My time at CNM prepared me for 14  my own business and it was a great 15  for making friends and discovering opportunities. 

I now work at the Nordic Clinic in Stockholm three days a week. I see a variety of 16 with a wide range of common illnesses, 17 them to get cured through nutrition. I love my work. I am 18 about what I do as it feels meaningful and I'm making a 19 to other people's lives. I can't imagine retiring from work because I know learning never stops and I love20 expanding my knowledge and helping people in need.

Do you want to do well in your study? If your answer is yes, you must know some good time management skills.  The skills listed below are quite important. 

You should have the ability to say "no". A party this weekend? An overnight trip on Saturday? Learning to say "no" can save you a lot of time. But it is not easy to do so. You should develop some good skills in saying "no". It is very good for your time management.

You shouldn't spare time for all the fun activities. High schools are amazing because there is always something fun for you. But you cannot spend time on all of the fun activities. Choose the one that you like most. You can go there when you finish your homework. 

You should avoid putting off your tasks. This is a bad habit. You may end up with too many tasks one day. If you have a task, don't wait to get started until the last, because you may not know what to do at all if you have too many tasks and you may end up in crisis.

Staying up a little too late? Maybe not eating a healthy dinner every night of the week? In order to keep in good health, you have to check on time so as to be energetic. Practicing a little self-care can really make you have enough passion for your work with your limited time while in school. 

A. A cool club to join?

B. Some students like putting off things. 

C. You should keep your health in check. 

D. Try your best to get rid of useless things. 

E. Here are some tips to help you learn to say "no".

F. But what skills are needed for good time management?

G. In this way, you needn't feel guilty about enjoying yourself.

Li Bai holds a wine cup in his hand, while Du Fu sits in front of a desk, writing poems on the paper in front of him. It's not that we have traveled to the past. Modern technology has brought ancient poets "back to life".

The two great poets, along with other humanoid robots were presented at the World Robot Conference 2023 in late August in Beijing. They looked similar to real human beings. 

"The skin is made of medical-grade bionic silicone ( 仿生硅胶) which is why the skin looks soft and veins can be seen through it," CGTN explained in a video about Liaoning-based producer EXROBOTS. Goosebumps (鸡皮疙瘩) and palm lines can also be seen on the arms and hands.

Researchers are also trying hard to create other features of humans on robots. A US robotics company Apptronik brought out its humanoid robot called Apollo on Aug 23. Apollo has around 30 muscles. However, humans have around 300 muscles in our bodies. For now, engineers can only simplify the muscles, allowing them to do basic movements like holding objects and walking. 

The robot also contains cameras, helping it map out a 360-degree view of its environment. It also has sensors (传感器) in its head to help keep balance when walking on uncertain surfaces. 

Nowadays, bionic human-like robots mostly work with humans, as tour guides or by helping visitors at front desks. There are also robots that share the work of nurses, such as handing out medicine. This could be because people are comfortable living and working with machines that look or act like them. "They can strike a chord (引起共鸣) with people," a US robotics scientist Marc Raibert told New Yorker.

As more humanoid robots come out, safety will be the key, according to the Robot Report website. When a 70- kilogram robot breaks down and falls, humans nearby may be hurt.