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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?

    Noise pollution is doing much harm to our health now. Noise，in fact，is unwanted sound and is a kind of invisible (无形的) killer. More and more students enjoy listening to music very much. When they listen to MP3 players, they like to turn up the volume (音量). Some people love listening to loud music. Furthermore, while watching TV, they keep the volume up. But they haven't realized that the noise is weakening their hearing. In fact, the noise not only influences each member in the family, but also makes a difference to the comfort of neighbors.

    Noise pollution is a source of increasing misery (痛苦) to people in our society. If people are often disturbed by it, they may feel uncomfortable or upset. What's worse, the noise can make people mad sometimes. If a worker works in a printing factory for too long, his/her hearing loss is much faster than a common person working in a quieter environment. So everybody must pay more attention to noise pollution. Generally speaking，the following four types of noise should be watched out for：

    Noise in the street

    Construction site (建筑工地) noise

    Noise at work

    Transportation noise

    I think the local department (部门) should take measures to control the noise levels, but it's everybody's duty to keep a quiet environment.

    Australia's Great Barrier Reef(礁) is the world's largest reef system. It is over 2,600 kilometers long. The reef is home to many animals: fish, birds, turtles, sharks and even whales. Unfortunately, the reef that all these animals call home is in danger.

    Climate(气候)change, over fishing and water pollution are damaging(毁坏)the reef every year. Coral(珊瑚)reef experts at Australian universities say that if we do nothing to stop it, the coral reef could be destroyed before the year 2030.

    Everyday things like driving cars, using electricity and running a factory give out greenhouse gases into the air. These gases make Earth warmer and warmer. This is a problem for the Great Barrier Reef and other reefs around the world.

    Coral is very fragile, and even a 2-degree increase in water temperature is enough to kill it, according to Ove Hoegh-Guldberg, reef researcher at the University of Queensland, Australia. If the water temperature doesn't go down, the coral dies.

    But it's not only the coral that's in danger. One quarter of all sea life lives on coral reefs.

    If air pollution is not slowed down or stopped, then the water will warm by at least 3 degrees in the next 20 years, according to reef experts in a report from University of Queensland. This would spell the end for the Great Barrier Reef and all its sea life.

    As space science develops, man has learned more and more about space. Space is not only amazing but also dangerous. While working in space, spacemen are facing danger as well as success.

    Scientists have found out that the radiation（辐射）is the greatest danger to spacemen in space. When spacemen are working in space, they are in danger of the radiation from the sun and other stars, which is bad for their health. The harm of the radiation won't be found until their children even grandchildren are born. Some special medicine may work a little, but no really effective medicine has been found so far.

    Space rubbish is also thought to be a great danger to spacemen. It's reported that there were 9,000 man-made things flying in space. About 30% of these are satellites, 10% are spaceships, and the rest are space rubbish. An explosion（爆炸）in space in 1999 made a cloud of 300,000 fragments, each at least 4mm in size. A small piece of these even knocked a spaceship window and caused some damage（损坏）.

    Scientists are watching and reporting any possible danger all the time. They are working to deal with space rubbish. Although space is really dangerous, it interests many people on the earth. In the near future, it may be possible for people to spend a few days in a space hotel. We may even choose to leave the earth and live in space in a few years. So we should do something to help improve the space environment.

Few parents can hear the words "What can I do to help?" from their kids. Teenagers spend more time on video games, computers and mobile phones, so they help less with housework.

Students at a primary school in Fuzhou, East China's Fujian Province were required to clean the school toilets to help them develop good habits. But some parents are strongly against the idea. They can't see the advantages of students doing such chores. They think that the school should provide students with a proper education, not the chance to be school cleaners.

In fact, parents, schools and society play an equally (同等地) important role in developing the character of students. It is good for schools to give students such tasks, because few of the students will do them at home. Their parents want them to do homework only.

In recent years, some parents will make mountains out of molehills when students are asked to do some chores in schools. Some will complain the teachers if their kids get hurt in schools; some will even challenge the schools' teaching methods and management. As a result, many primary schools, especially those in big cities, do not let students join in outdoor activities during breaks, fearing that they might get hurt. This is bad for the development of students' best qualities.

What the primary school in Fuzhou doing is worth praising. Doing chores can put a sense of responsibility (责任感) into students' minds and teach them the spirit of rules as well as teamwork. Also, it can make students' in-school experiences more meaningful.

Stamp collecting is becoming a big hobby for young people to remember their trips. Lovers of this hobby enjoy collecting stamps about the places they visit. They usually buy stamps in the local(当地的) post office.

Jenny, a 25-year-old teacher, enjoys collecting stamps. For her, this is a great way to record her trips. Once during a two-day trip to Beijing, she collected over 90 stamps! They're all about beautiful artworks.

Ben, a 12-year-old teenager from Beijing, said collecting stamps helped him learn about the culture and history of a place. He likes to buy different kinds of stamps while travelling. For example, when he went to Xi'an, he bought a special stamp. It has a picture of an old Chinese stone bridge on it."The stamp looks very marvellous. It makes me more interested in Chinese culture,"he said. Then he started to look for more stamps with interesting pictures. Ben also shares them with his friends. It encourages them to visit more places.

"These days, more and more tourists share their stamps online. Stamp collecting is a good way to help people know more about the local culture. It's really educational,"said Gina, a teacher from a school of Tourism Management in Dongguan.