“化学为生命密码解锁”，“DNA”承载着生命遗传的密码，胞嘧啶（C₄H₅ON₃）是DNA水解产物之一．
（1）胞嘧啶中碳、氢、氧、氮四中元素的质量比为____
（2）____g胞嘧啶中含32g氧元素？

用所给词的正确形式填空
                                                                                My  Dream  Job
        When I grow up, I'm  ____   (go) to do what I want to do. I'm going to move somewhere    ____  (interest). Paris     ____   (sound) like a city that I could enjoy. There are   ____   (lot) of art exhibitions there. I want to be    ____   (a) artist. So how am I going to do it?    ____   (one), I'm going to find a part-time job for a year or two and save some money. Then, I'm going to be a student at an art school in Paris. And I'm going to study    ____    (France) at the same time. Next, I'm going to hold art     ____ (exhibit) because I want to be rich and buy a big house for my   ____  (parent). I also want to travel all over the world. One day, I'm going to retire somewhere quiet and   ____    (beauty).

如图所示，当开关S断开和闭合时，电流表示数比是1：4，则电阻R₁和R₂之比是（　　）

阅读下列材料：

两宋时期，在气候温和、资源丰富的南方，形成了闻名天下的“粮仓”，培育出新的手工行业，出现了世界上最早的纸币。

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