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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?

    How much do you know about air pollution? When people talk about air pollution, they usually think about outdoor air 1. But do you know that there is also 2 pollution inside homes, offices, hotels and other buildings? The air in your home can be 2 to 100 times more polluted than the air outdoors! In fact, some American doctors say that 50％ of illnesses have something to do with 3 indoor air.

    A lot of pollution comes from 4 activities such as smoking and cooking. As most people 5 about 80％-90％of their time inside buildings, it is important to take indoor air pollution seriously too.

    Air pollution influences our health in many ways. When the air is polluted, not only 6 children and old people suffer from it, but people with 7 problems suffer as well. Indoor air pollution can 8 people's eyes, noses and throats. Air pollution, both indoor and outdoor, can also lead to lung cancer and heart disease! In the Great Smog of London in 1952, 4,000 9 died in a few days because of the pollution! It is 10 that half a million young children and women die each year in India because of indoor air pollution!

    June 5th is World Environment Day. This makes us pay more attention to our environment. When Wang Boxuan, a Beijing high school student, uses up his exercise books, he does not throw them away. Each one is kept at his school with hundreds of exercise books that are given by other students. Then they are sold to a Beijing paper-making factory.

    The paper is recycled and used again by students and teachers in the school. At the same time, the money that is made from the sales goes to schools in Inner Mongolia(内蒙古). The government there uses the money to plant more trees and grass. This place is one of the sources(源头)of the sandstorms(沙尘暴)that often attack Beijing during springtime.

    Wang's school is one of the schools in the capital that take part in the \"green promise" environmental protection activity. So far, nearly210，000 students have taken part in the activity, collecting more than 87 tons of waste paper.

    Have you ever paid attention to the Air Quality Index (空气质量指标) or AQI reported in the newspaper? The AQI helps us understand what the air quality around us means to our health. The AQI uses colors, numbers and words to tell us about the air. Let's see what these colors and numbers mean.

    When he was nine years old, an American boy called Milo Cress had a question: How many plastic straws (吸管)do Americans use every day?

    He quickly learned there wasn't a simple answer. The boy tried to find it out himself. Through lots of research, Cress found out that Americans use about 500 million straws every day. In hopes of cutting down plastic waste, he founded the Be Straw Free project in 2011.

    Cress started the project in his hometown Burlington. Vermont. He asked a local restaurant to stop offering straws with every drink order. It was a simple change. However, it would save money. And by doing that, the restaurant would cut down on its straw use by 50 percent.

    For the year that followed, Cress tried to spread his project across the United States. More and more restaurants agreed to join. They stop providing the customer with a straw unless he or she asks for one. Last April, Seattle became the first American city to completely ban plastic straws.

    After his project became popular, Cress took his findings on the road. He has spoken to tens of thousands of students around the world. He wants to encourage more people to say no to plastic straws.

    "Focusing on straws is one simple step we all could take," Cress says. "And it makes me feel that I, as a kid, could make a difference, too."

    There was a world's advanced robot exhibition in Moscow. Over 20 skilled robot performers from all over the world took part in the exhibition.

    The exhibition was opened by British-born Titan, a world-famous dancing robot that had performed together with artists. Besides its quick moves, the robot is also known for its stand-up comedy and beautiful voice.

    Robot Hespin, a life-sized humanoid robot can make others happy. The robot not only sings and dances but also acts as a museum guide. It's very impressive. It can even hold conversations with humans.

    Then there is Cubic, an ordinary boxy robot that has been created to make our lives easier. It can read the latest news, switch off lights, and order pizza. Cubic can hold basic conversations and tell jokes.

    South Korea's friendly robots not only dance but also clean floors. Germany's famous metal rock band performs wonderfully.

    Most of the robots seem to have some kinds of dancing skills. The organizers say that their main purpose is to create a meeting place or a global platform to enable the people of Russia to experience some of the world's most advanced robots.