用化学用语填空：
①2个氢分子____ ；②3个氧原子____ ；③铜离子____ ；④缺乏____ 元素，会导致骨质疏松，佝偻病；⑤+2的镁元素____ 。

阅读理解。

    Aunt Judy's birthday is coming. She will be 38 years old. Dad and Mum are going to take me to her house. She lives in Guangzhou. We are going to go there by train. Her birthday party will be on Saturday. We are leaving on Friday afternoon. And we are coming back on Sunday evening. I am going to give my dear Aunt Judy a picture . I am drawing it now. I am drawing some beautiful flowers. I am drawing a small dog, too. That's because she likes dogs. The picture will be very nice.