一瓶未贴标签的粉末状常见金属R，为了测定R的相对原子质量，准确称取一定量金属粉末，在坩埚内加强热使其完全氧化，冷却后再称重，重复试验，获得如表数据。请回答：

（1）表格中m=　    　。

（2）该金属氧化物中，R元素和氧元素的质量比为　       。

（3）已知R的化合价为+3价，则R的相对原子质量为　        　。

    Christmas is coming.1 you are thinking what gifts you need to buy, the Alice Ferguson Foundation is busy 2 the environment by building relationships between people and nature.

    At the 3 of the year, it designs events to help children celebrate Christmas without increasing the amount of 4 they create.

    Hanna Seligmann who works for the foundation, said they 5 that from Thanksgiving Day to New Year's day, the household trash increases by 25 percent. Many young people do not know the6 they throw away do not decompose (分解), or break down, at the same rate. For example, paper dissolves（溶解） in about four weeks. A metal can take up to 100 years. A plastic bag will not decompose for 450 years. Glass takes 1,000 years.

    Hanna Seligmann shows adults and children 7to reduce waste during the holiday gift-giving season.

    She encourages using things that are 8 in our houses like newspaper or old magazines. With imagination，children can wrap gifts in a 9 napkin or even a beautiful scarf. In fact，there's no better way to celebrate the holiday by giving10to the planet.

法国当代著名的哲学家、文学家萨特说：“一个人从他被投进这个世界的那一刻起，就要对自己的一切负责。”对自己负责，说到底是（  ）