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   Cats are the most popular pets among Americans. So it is not surprising there are many expressions about cats. Do you know any of them? Now let me introduce some to you.
   Some cats like to catch small birds, like canaries. If someone looks very proud or satisfied with himself, we say he looks like the cat that ate the canary.
   Sometimes, a cat likes to play with a small animal it catches. So if you play cat and mouse with someone, you change between different kinds of behavior when dealing with another person. For example, a child might offer something sweet to her little brother, and then take it away when reaches for it.
   A cat will often catch a small animal and present it to its owner. The saying “that looks like something the cat dragged in (把…拖进来)” describes something in bad condition.
   A fat cat is a person with a lot of money.
   There are many other expressions about cats in America. How interesting! Which kind of cat are you, or which kind would you like to be?

    Many of us enjoy watching animals in the world. But do you know they can teach us?

    Geese(雁), for example, teach a very good lesson about 1. In the fall, Canada geese fly to the warm south to 2 Canada's cold winter. They lift off in no order. Yet 3 they form a V shape, with one bird leading the group.

    This V shape allows geese to 4 energy. When the front bird moves its wings up and down, the resulting force of the air lifts the next one. This continues down the line. The bird 5 has the hardest job. When it gets6 , it moves behind, and another bird moves into the lead. By sharing the role, the group can travel great distances. Geese flying in a V shape can fly 70 per cent farther without 7 than birds flying alone. During the long flying journey, geese communicate with one another. They honk(鸣叫) to 8 the birds up front to keep up the speed. They also cheer each other up 9 working toward a common goal.

    What have we learned from the lovely geese's experience and skills?

    10 together! Whether it is our personal lives or our jobs, we need other people. We need the spirit of teamwork!

    Have you ever dreamed about a trip to the space? Seeds (种子) of some vegetables and crops are a lot luckier than you, as they have travelled to space and back.

    China is among the three countries in the world that carry out agricultural research (农业研究) in space. The others are Russia and the US.

    Since 1987, China has sent about 1, 000 species of seeds into space.

    These include green peppers, tomatoes, cucumbers (黄瓜), carrots, lettuce and wheat. Even on China's first manned spacecraft Shenzhou—V, there were some seeds from Taiwan.

    "Conditions in outer space such as radiation (辐射) and low gravity can cause big changes in the seeds," said Chinese researcher Jin Xing.

    But not all seeds are better after going to space. After returning to the Earth, the best seeds are selected. These seeds produce (生产) much more and also grow faster than normal (正常的) seeds

    Cycads(苏铁)grow in warm places. They are tall and green all year round. Their leaves grow on the top and flowers seldom come out. Some have bright orange fruits. They usually need hundreds of years to grow into adult plants.

    Cycads are facing problems now. In South Africa, the situation of cycads is getting terrible, but this has drawn little attention from the public. "In fact, there are 38 kinds of cycads in South Africa. Among them, 2 kinds have disappeared since 2003 and 25 kinds are in great danger," said a gardener. "Do you know what the loneliest plant is in the world? It is Wood's Cyead. Someone found it in a forest in 1895. It is the only one of its kind."

    So what causes cycads to be in danger? Surprisingly, the danger is from the people who love them most. These slow-growing adult cycads even sell for tens of thousands of dollars each. As time goes by, they have become a symbol(象征)of wealth and position(地位)in society. This makes cyead lovers want to own more. Cyead lovers buy and plant them in their private gardens. As a result, nearly all these cyeads die because the living conditions have changed.

    Recently, South African government has taken some actions to protect cycads from being stolen traded. At the same time, people around the world should also work together to protect the plants.