Dogs are good friends of humans. Some dog lovers want to take their pets along with them wherever they go. However, many malls, bars and restaurants don't allow dogs inside. But in good news for dog owners, the world's first bus tour for dogs appeared on the streets of London last month.

    The tour is free. It takes owners and their dogs to some of London's best parks and hottest dog-walking spots(地点). For example, the buses stop at Hyde Park and Green Park. The tour guides on the buses explain the history of dogs in London and about the many corgis(柯基犬) owned by Queen Elizabeth II. They also give the owners a map of dog-friendly bars and restaurants in the city.

    An important question about eating out is who pays for the meal. If a friend of yours asks you to have lunch with him, you may say something like this, "I'm afraid it'll have to be someplace cheap, as I have very little money." The other person may say, "OK, I'll meet you at McDonald's."

    This means that the two agree to go Dutch, that is, each person pays for himself. He may also say, "Oh, no. I want to take you to lunch at Smith's," or "I want you to try the Chinese dumplings there. They're great." This means the person wants to pay for both of you. If you feel friendly towards this person, you can go with him and you needn't pay for the meal. You may just say, "Thank you. That would be very nice."

    American customs (1) about who pays for dates (2) are much the same as in other parts of the world. In the old days, American women wanted men to pay for all the meals. But, today, a university (3) girl or a woman in business world will usually pay her way during the day. If a man asks her for a dance outside the working hours, it means "Come, as my guest (4)." So as you can see, it is a polite thing to make the question clear at the very beginning.

    Many scientists think that the earth is getting warmer and warmer. If the change continues, the natural world and human society will face danger. Scientists believe human activity is responsible for the climate change. We produce too many greenhouse gases. They keep heat in the air and make the earth warm.

    Many of the world's governments agree. And they want to solve the problem. So from December 7 to 18, 2009, they held a conference in Copenhagen, Denmark to talk about global warming and climate change.

    Representatives(代表) from 192 countries and regions went to the meeting. Although they have not reached an agreement, the Copenhagen Accord(《哥本哈根协议》) was an important beginning to save the earth. It was made by a small group of countries including China, the US, India, Brazil and South Africa. Some other countries at the conference also showed support.

    What are the key points of the Copenhagen Accord? The accord limits global temperature increases to 20C by 2050 compared to pre-1850. Scientists think it could help the world to avoid serious climate change.

    The accord also says that developed countries must promise to cut greenhouse gas emissions(排放) to the UN by January 31, 2010. The accord asks developed countries to give money to help developing countries.

    Many countries and organizations are disappointed that the conference didn't reach a legal document(法律约定). And they think the accord is not clear enough about its goals.

    African leaders are worried that the goal of a 20C global temperature increase isn't good enough, because it will mean a much higher increase in temperature across Africa. This could cause big problems like food and water shortages across the continent.

    Still, UN Secretary General Ban Ki-Moon believes the conference was an "improvement".

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