第22届冬季奥林匹克运动会于2014年2月7日在俄罗斯索契成功举办，如图所示为索契冬奥会宣传海报，索契之所以能举办冬季奥运会，其原因是（ ）

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Bury trip﹣﹣June 18th，2016

    We will be leaving the Perse School at 13：45．Please be at the school gate 10minutes early．If you are late，you may miss the bus and not be able to go! If you miss the bus，you won't get your money back．The bus is planned to arrive in Bury at 14：30，although this depends on traffic．You will have free time to walk around and we will meet at the same location where we arrived at 17：15to return to the Perse School by about 18：00．

    Things to do Visit the Abbey

    The Abbey is the min （废墟）of a church which was built more than 1，000years ago．There are many nice gardens in it．And next to the Abbey，there is a big new church．

    Have a drink in the Nutshell

    This little bar is famous in Britain because it is officially （正式地）the smallest bar in the country．Good things are put in small bags，and the Nutshell serves some of the area's finest beer，as well as fascinating photos．

    Have a look at a beer shop

    At the Greene King shop you can taste and buy some of the local beer，as well as food such as potato chips．There are also clothes available to buy．

    Several places are listed，but feel free to plan your own visit．

阅读下列短文，根据短文内容，从短文后各题所给的A、B、C、D四个选项中，选择最佳选项。

                                                                                       Bags of Love

      Last year, I worked in a middle school near my mother's house, and I stayed with her for a month. During that time, I helped her do some

 housework and buy some food.

      After the first week, I noticed that the food was eaten up very quickly. Then I began keeping an eye on my mum. To my surprise, I found

that she would put some of the food into a paper bag and go out with it at about nine every morning. And finally, I decided to follow her. I saw her taking the food to the street children. She would also spend a lot of time talking and playing with them.

      One day, I talked to a neighbour and found out that my mum was well-known in the area. The children were very friendly with her and even thought of her as their own mother. Then it hit me – why wouldn't she want to tell me about it? Was she worried that I would stop buying food if I found out?

  When my mum got home, I gave her a big hug (拥抱). I told her she didn't need to keep it a secret from me. And she told me something about the children. Some of them lived with an old lady in a small house. Others slept on the street. For years, she was helping the poor street children by giving them food. After she told me everything, I was so moved by how selfless (无私的) she was. She helped others in need. As her son, I was so proud of my mum.

      I continued to buy food for my mum after that. But I always added one more bag for her other children.

 工业上常用二氧化碳和氨气（化学式：NH₃）反应来制取尿素化学式：CO（NH₂）₂，该反应的化学方程式为：CO₂+2NH₃CO（NH₂）₂+H₂0，现生产240t尿素，需要氨气的质量为多少？