三大营养物质在消化道内被消化的顺序是（  ）

铁路运输填图

如图所示，由不同物质制成的甲、乙两种实心球的体积相等，此时天平平衡．则制成甲、乙两种球的物质密度之比为（　　）

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国有企业改革首先从什么开始（   ）

     What is your zodiac（生肖） animal? According to the Chinese lunar calendar（农历）, 12 animals mark 12 different years. It is the basis of the Chinese zodiac. Nowadays, Chinese zodiac animals have worldwide fame and are increasingly popular among western people.
    The zodiac is an important part of Chinese culture. People believe that the characteristics of a zodiac animal influence the personality of every person born in that year. For example, people born in the Year of the Tiger are considered powerful and brave.
    Zodiac animals also have some social functions. When people think it is not proper to ask: “How old are you”, they may change their question to “What is your zodiac animal?” With this question, you can figure out roughly which year someone was born and the person’s age.
     Zodiac animals are not special to China. Many countries share a similar zodiac culture with China. For example, in the Japanese Zodiac, a wild boar（野猪）takes the place of a pig and the Vietnamese（越南的）zodiac has a cat instead of a rabbit.
    But have you ever wondered how these 12 animals were chosen to represent each year? According to legend, the Jade Emperor（玉皇大帝）invited all the animals to join him for Chinese New Year. Only 12 animals went to see him. As a reward he named a year after each one in the order they arrived. The ox would have been the first to arrive, but the rat sat on his back and jumped off just before they arrived to come in first place.