阅读下列短文，从每题所给的A、B、C、D四个选项中选出最佳答案。

　　Tibet is one of the most popular places for Chinese tourists．The number of travelers to Tibet has grown by 10％ every year over the last few years．Since July 1, 2006, when the first train ran the 1, 956 kilometers from Xining to Lhasa, more and more people have been going to Tibet．

　　The train stops at several famous places along the way, such as Qinghai Lake, Kunlun Mountain, and the Potala Palace(布达拉宫)．Passengers can also enjoy many activities during the journey, like Tibetan dancing and Karaoke．

　　On the train, passengers in the seats can have tea, eggs and noodles for breakfast, and fried chicken and green vegetables for lunch and dinner．Unlike most Chinese trains which have open-hole toilets(厕所), this one has special toilets which can collect the waste．There is also a special rubbish system in the train that keeps the environment clean．All the windows on the train protect people from the bright sunlight．TVs and electrical sockets(插座)for computers and mobile phones can be found on the train．

　　Because there isn't much oxygen(氧气)high in the Tibetant Plateau(高原), trains will have oxygen masks(氧气罩)for those who need them．They are there to ensure that passengers feel comfortable when they have enough oxygen on the famous “roof of the world”．There are also doctors on the train to make sure that all of the travelers are safe．

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