Today, the world's diversity (多样性) of food crops is quickly decreasing. But scientists around the world are taking action. They are building seed banks. At seed banks, scientists store the seeds of many different crops.

    There are now 1,400 seed banks around the world. However, some banks are in warm countries. If the electricity fails, the seeds will get too hot and die. Other seed banks are in countries troubled by war. Sometimes people damage the seed banks. If this happens, valuable seeds can be lost forever!

    The organization Global Crop Diversity Trust decided they wanted to deal with this problem. So, they decided to build a global seed bank. This seed bank would contain a back-up, or extra copy, of all the world's seeds. Smaller seed banks would still collect and keep local seeds. But they would also send copies of their seeds to the global bank.

    Scientists from the Global Crop Diversity Trust chose the cold, snowy mountains of Svalbard, Norway to build the global seed bank — the Svalbard Global Seed Vault (斯瓦尔巴全球种子库). Organizations, farmers, or local seed banks store their extra seeds there. And the people who place their seeds in the vault are the only people who can take them out. They pay to ship their seeds to Norway, but it does not cost them any money to store their seeds. The Global Crop Diversity Trust pays for this.

    Cary Fowler is a scientist who heads the Global Crop Diversity Trust. He said, “If the Seed Vault simply supplies seed banks with copies of seeds that those banks lost by accident, the Seed Vault will be worth more than it cost.”

    As most of us know, talking and listening don't go smoothly every time. Will parents take you seriously, believe what you say, listen to and respect your opinions? {#blank#}1{#/blank#} But some of what happens depends on you, too. Since communication is a two-way street, the way you talk can influence how well a parent listens and understands you. So here are some guidelines to consider when talking to parents:

    Be clear and direct. Be as clear as you can about what you think, feel, and want.{#blank#}2{#/blank#} They can listen better or be more helpful if they understand what you mean and what's really going on.

    Be honest. If you're always honest, a parent will be likely to believe what you say. If you sometimes hide the truth or add too much drama, parents will have a harder time believing what you tell them. If you lie, they'll find it hard to trust you.

    Try to understand their point of view. If you have a disagreement, can you see your parents' side?{#blank#}3{#/blank#}Telling parents you understand their views and feelings helps them be willing to see yours, too.

    Try not to argue or complain. Using a tone that's friendly and respectful makes it more likely parents will listen and take what you say seriously.{#blank#}4{#/blank#}If you think your emotions might get the better of you, do something to blow off steam before talking: Go for a run. Cry.{#blank#}5{#/blank#} Do whatever it takes to sound calm when you need to.

A. Hit your pillow.

B. If you can, say so.

C. A lot depends on your parents.

D. Think twice before you make a decision.

E. Your parents won't always see things your way.

F. Give details that can help parents understand your situation.

G. Of course, this is hard for any of us when we're feeling heated about something.

When I lived in Spain, some Spanish friends of mine decided to visit England by car. Before they left, they asked me for advice about how to find accommodation. I suggested that they should stay at "bed and breakfast" houses, because this kind of accommodation gives a foreign visitor a good chance to speak English with the family. My friends listened to my advice, but they came back with some funny stories.

"We didn't stay at bed and breakfast houses," they said, "because we found that most families were on holiday." I thought this was strange. Finally I understood what had happened. My friends spoke little English, and they thought "VACANCIES" meant "holidays", because the Spanish word for "holidays" is said "vacaciones". So they did not go to the house where the sign outside said "VACANCIES", which in English means there are free rooms. Then my friends went to the houses where the sign said "NO VACANCIES", because they thought this meant people who owned the house were not away on holiday. But they found that these houses were all full. As a result, they stayed at hotels.

We laughed about this and about mistakes my friends made in reading other signs. In Spanish, the word "DIVERSION" means "fun". In English, it means that workmen are repairing the road, and that you must take a different road. When my friends saw the word "DIVERSION" on a road sign, they thought they were going to have fun. Instead, the road ended in a large hole.

English people have problems too when they learn foreign languages. Once in Paris when someone offered me some more coffee, I said "Thank you" in French, I meant that I would like some more, however to my surprise the coffee pot was taken away! Later I found out that "Thank you" in French means "No, Thank you".

Gardening 380 Kilometers above Earth

    Astronauts have to go through physical, psychological, and technical training. They also go through training in how to care for plants. These “astronaut gardeners” share their work and living space with plants.

    Taking seeds and plants along on a trip isn't a new idea. As space trips become longer, it will be necessary to grow food in space. {#blank#}1{#/blank#} Because of this, it's not practical to send everything needed for a long journey, only to be used once and thrown away.

    Plants can serve many uses on a space journey. They can provide more fresh things. {#blank#}2{#/blank#} Also, plants can help to make air quality better because they produce oxygen. They can improve the quality of the air inside the spacecraft—the only air the astronauts can breathe.

    {#blank#}3{#/blank#} Due to the lack of gravity in space, the oxygen that the plants produce stays around the plants. This can actually kill them, so fans are needed to circulate the air. Without gravity, roots don't “know” to grow down, leaves don't “know” to grow up, and water doesn't easily travel up the roots to the leaves. {#blank#}4{#/blank#} Besides, soil is too heavy to send to space, and special liquid gels (胶) are used to help plant growth.

    Scientists are also working on the plants themselves. They are trying to make plants grow more rapidly and grow with less water and light in space, and they are looking for ways to make plants more resistant to disease. {#blank#}5{#/blank#} Imagine that deserts may one day provide lots of fresh food for local people, saving transportation costs. Similarly, plants that are resistant to disease could provide an important food supply. With the world's population now at seven billion (十亿) people, our astronaut gardeners may help discover ways to feed those billions.

A. Every plant grown in space must have several uses.

B. However, there are challenges with growing plants in space.

C. Such methods may result in improvements back here on Earth.

D. The cost of taking anything into space is about $22,000 per kilogram.

E. Specialized containers are being developed to help the plants grow correctly.

F. Astronauts will welcome the addition of fruits and vegetables to their diet of dry foods.

G. Currently all oxygen is taken aboard in tanks and then caught again so it can be reused.

The man who could see the future

    The ability to predict the future is a rare talent. American author Isaac Asimov (1920-1992), one of the great science fiction writers of his age, had such a talent. {#blank#}1{#/blank#} Now that we're here, let's see what he got right.

    {#blank#}2{#/blank#} Asimov thought computers would cause a revolution comparable to the industrial revolution of the 19th century. Specifically, he said that "mobile computerized objects" would be an important part of everyday life. Here, he clearly predicted our world of smartphones, tables and other devices. He also had a great deal to say about space exploration. {#blank#}3{#/blank#}

    How did Asimov develop his special sense of future developments? {#blank#}4{#/blank#} He read the newspapers and magazines sold in his parents' candy store. His scientific interest gained sharper focus at Columbia University in New York. Asimov went to study chemistry, but became bored with pure laboratory science. Instead, he thought hard about the social implications (作用) of science. He wanted to communicate his ideas to the public.

    {#blank#}5{#/blank#} Asimov had his finger on the pulse (脉搏) of both scientific and social change. He had a clear vision of what was coming around the corner for humanity in his works like the Galactic Empire series (《银河帝国系列》). "His predictions are absolutely fascinating," Calum Chase, an English writer, told BBC News. "He was a genius."

    There are some children who love to fly and then there are the kids who are afraid of the unknown. The following tips may help you if you want to travel with your children by plane.

    ●{#blank#}1{#/blank#} If you tell the child he will soon be flying on an airplane and leave it at that, his imagination can turn to fear. Instead, tell him how wonderful it is to fly.

    ●Don't tell children about the dangers of flying. {#blank#}2{#/blank#} And you can promise him that the plane will not crash.

    ●Read a book to your children. {#blank#}3{#/blank#} Reading may also make your children fall asleep.

    ●Bring a comfort thing that your child enjoys. {#blank#}4{#/blank#} Be sure to bring that blanket along as it will provide a safety net for the child. Having this blanket along may also help him fall asleep. Bring a safe electronic device that shows movies or supports video games, and offers children puzzles.

    ●Bring snacks. Children are picky eaters and may not like the food being offered. Three to five hours can be a long time on an airplane without food. {#blank#}5{#/blank#} When they are upset, it is easier to let fear of the unknown take control.