1 . Stephen Warren, study leader at the University of Washington — has been on the case of the green icebergs for more than 30 years. He first took samples from one of these green hunks of ice in 1988, near the Amery Ice Shelf, East Antarctic. Most glacial ice occurs in shades of white to brilliant blue. The bluer the ice, the older it is. Typically, compression (压缩) from accumulating layers of snow pushes air bubbles out of the ice, reducing the scattering of white light. The compressed ice absorbs most of the light except for blue — creating the blue color seen in the hearts of icebergs and glaciers.

The green ice was similarly bubble-free, and yet it looked green instead of blue. Warren and his team soon found that the green ice came not from glaciers, but from marine ice. That’s the ice from the undersides of floating ice shelves.

At first, the team thought that organic material in the marine ice was causing the green color. But further research showed that the green marine ice didn’t have a higher-than-usual amount of organic impurities. Now, a new study finds that a different sort of impurity may be the root cause of the green ice. Warren and his colleagues report that the marine ice at the bottom of the Amery Ice Shell has 500 times more iron than the glacial ice above.

This iron comes from the rocks under the Antarctic Ice Sheet, which are turned into fine powder as glaciers move over them. The icebound iron oxidizes (氧化) as it contacts seawater. The resulting iron oxide particles take on a green color when light scatters through them. When icebergs break off the larger ice shelf, they carry this iron-rich ice with them. It’s like taking a package to the post office. The iceberg can deliver this iron into the ocean far away, and then melt and deliver it to other living things that can use it as a nutrient.

We three were running down the path, shouting and laughing when our dog Rubby suddenly stopped in the distance. He turned around and eyed us, with his tail swinging up and down.

My little brother Toby immediately sped up and rushed to where Rubby was. He bent down. picked up something and ran back to us.

It was a bunch of keys. We gathered in a circle, examining the keys one by one. hoping to find some useful information about its owner. There were 3 keys — a house key, a mail key and a car key and a unique key fob (吊坠) very likely designed specially.

“Gosh, the owner might be in great trouble,” my sister sighed. She was right. We once lost our keys. Although we had an extra house key, it took our parents quite a long time to get a new mail key. let alone there was a car key.

Who might have lost them?

Alter many wild guesses, we finally drew a conclusion. It might belong to someone in our neighborhood as only our neighbors wandered into the woods for a walk. But it was still impossible to figure out who it was. We had a very big neighborhood.

“The owner might come back to look for them,” Toby reminded.

So we decided to stay where we were, keeping a watchful eye on all passers-by. Our little dog ran in circles of excitement since we stayed so long in the wild. We remained in the woods for two hours, asking everyone we came across whether they lost their keys, but in vain.

It seemed we had to give up. But my sister wouldn’t, saying that she just couldn’t stop picturing the owner brushing aside tall grasses hoping to find the lost keys. “How anxious and upset the owner would be!”

I took a look at the bunch of keys again and quite by accident, found the key fob had the alarm button. “Look! If we press the alarm button, close enough of course, we can set off the owner’s car alarm.”

“That’s brilliant.”

We rushed back to our neighborhood.

The door opened and in front of us stood an old lady.

A good teacher-student relationship will make learning enjoyable and interesting for the students.

To set up a good teacher-student relationship, a teacher’s     1     (behave) is important. The teacher should motivate(激发) the students so that they want to learn. A good teacher should be     2     (patience), friendly and strict. However, being too extremely friendly may cause students to become lazy and stop making progress. On the other hand. being too strict may frighten the students. So a teacher should avoid    3     (go) to extremes(走极端) in treating his students. And teachers should encourage the students to think independently and learn to study by     4     (they).

As for the students, they must always respect their teachers. Students should be eager to learn as well as willing    5     (work) hard. It     6     (be) important to listen with attention in class and it’s more important to learn to raise some questions and work out problems     7     new ways.

Above all, both students     8     teachers have to focus on what they should do most.     9     means that the students have to study hard and teachers have to be responsible when teaching. Besides, students and teachers have to respect each other, which is an    10     (extreme) necessary basis of setting up a good teacher-student relationship.

Today is my son Matthew’s last day at home before college. I know that this is good news. I feel extremely proud that Matthew will go to a great school. But looking at the suitcases on his bed sends me out of the room to a hidden corner where I can’t stop crying     1     (bitter). Maybe it’s normal for most people.

    2     (feel) rather depressed, I tell myself, “Pull yourself together!” There are parents sending their kids off to battle fields.

One of the greatest gifts of my life is my boys, Matthew and John Owen. Through them, I have explored the mysterious and complicated bond(纽带) between fathers and sons over the past years By the time Saturday came around, I     3     (be) unable to enjoy the day’s activities.

Now, standing among Matthew’s so many things including a     4     (collect) of science magazines, all of a sudden, I realize it’s me who has become a boy again. All my sadness and longing     5     (hold) on to things are back, sweeping over me as they did when I was a child.

His bed,     6     position is in the corner of the room, is tidy and spare. It already has the feel of a guest bed, In my mind I remember wrapping him in his favorite blanket. That was our nightly routine until one evening he said, “Daddy, I don’t think I need a blanket tonight.” I think of all the times when we lay among the covers, reading books or magazines, I look at the bed and think of all the recent times when I was     7     (annoy) at how late he was sleeping. I’ll never have to worry about that again.

For his part, Matthew, who is an     8     (ambition) boy, has been a rock. He is treating the time to leave as just another day at home. After all, someone’s got to be strong. The reason why I’m proud is     9     he is charging into the first chapter of his adult life with such confidence. I myself am to blame     10     the feelings of sorrow and bitterness.

8 . How to choose a career-for many, it’s a big and scary question. Deciding on the right career path is one of the most important decisions you’ll make in your life. With endless career options available, making the right choice can be overwhelming (令人不知所措的).     1    . Here is a practical guide on how to choose a career path.

    2    .

No matter who you are, I know there are plenty of things you’re good at. Make a list of every single one that comes to mind. What subjects did you do very well in school? What talents do people compliment (赞美) you on? These are all evidences that tell you what your strengths are. Don’t leave out any skill, even if you don’t think it qualifies as a career skill. You never know how your unique set of strengths could transfer to a job.

Figure out your motivation.

The next factor you need to consider is your mission. Who are the people you most want to help? What problems do you want to solve? What causes inspire or concern you? How have you been able to help people in ways that were meaningful to you?     3    , because without having a deeper purpose of or the reason for your work, it will be hard to stay with it in the long term.

Do some research.

Thorough survey about the listed careers is of great importance. Here is where you could find out the minimum requirements for each profession educationally, physically and mentally. As you continue your research, first consider jobs that are in line with your expectations.     4    

Identify your passions (激情).

Passion isn’t just a pipe dream (白日梦). It’s a very real and necessary part of doing a job that’s meaningful to you. No one wants to do work that makes them feel bored! Finding your passion doesn’t mean the work will always be easy, but it does mean you’ll be fulfilled while doing it. Make a list of the activities that bring you to life, energize you, inspire you, and make you lose track of time.

    5     when you choose the future job.

9 . The future of space exploration may depend on an art form from the past: origami (折纸艺术), the ancient art of paper folding.

Researchers from Washington State University (WSU), US have used origami to possibly solve the problem of storing and moving fuel to rocket engines, a key challenge in space travel, according to Newswise. They’ve developed a foldable plastic fuel “bladder (囊状物) “resistant to super cold temperatures, which could be used to store and pump fuel in spacecrafts of the future. Their findings have recently been published in the journal Cryogenics.

“Folks have been trying to make bags for rocket fuel for a long time,” said Jake Leachman, one of the lead researchers. “We currently don’t do large-scale and long-duration trips because we can’t store fuel long enough in space.”

Meanwhile, NASA is also looking to paper folding to help observe distant planets. The agency is currently developing Starshade, a foldable, sunflower-shaped piece of hardware that would help block starlight and enable telescopes to view distant objects more clearly in space.

“A huge part of my job is looking at something on paper and asking, ‘Can we fly this?’” Manan Arya, a technologist in California, said. “Once I realized this is how you fold spacecraft structures, I became interested in origami. I realized I was good at it and enjoyed it. Now, I fold constantly.”

Using origami for space purposes isn’t new, however. Solar arrays (太阳能阵列), experimental wings for space shuttle programs and an inflatable satellite were also inspired by origami in both past and present space projects.

“With most origami, the magic comes from the folding,” Robert Salazar, who helped design the Starshade and now works on the Transformers project, said in a statement. “There are so many patterns to still be explored.”

10 . Experiencing culture

CHI’s Academic Year Program (AYP) is your chance to study in America and spend either an academic year or a semester living with a volunteer host family.

The requirements for studying in America

*High school students who are aged 15 to 18

*A score of at least 212 on the ELTiS (English Language Test for International Students) exam

Application

Contact a partner agency in your country or a nearby one. We can also send you a list of partners near you. They will set you up with an application and let you know what you need to submit in order to be considered.

Admission and visa

Our Admission Department reviews and accepts your application. We issue and send your agency the Form DS-2019, which is the official US Department of State document that allows you to apply for and receive your J-1 visa. Once you receive the DS-2019, you can make your visa appointment, When the visa is granted(授予), you are set to travel to America.

Homestay

Meanwhile, our Field and Operations staff work hard to find you the perfect family and school as soon as possible! Once they find the right host family for you, you can start to get to know your host family by email.

Depart to the US and meet your family and friends

Your agency will book your flight according to your school start date. When you arrive, we will give you a student orientation(迎新会)and introduce you to other exchange students and the surrounding community. When school starts, you will begin the process of cultural exchange.

Contact us: 1-800-432-4643; 1-415-459-5397

Location: 255 W End Avenue San Rafael, CA 94901