利用反应2Cu+O₂+2H₂SO₄=2CuSO₄+2H₂O可以制备CuSO₄，若将该反应设计为原电池，其正极电极反应式为____。

地球上的生物可以分为五大类群：____、____、____、____、____．

    My name is Leo. I am eight years old. I am 1 the UK. I like 2 model aeroplanes. I want to be a pilot. I 3 to fly an aeroplane.

    There are six people in my family. My parents are both 4. I have two brothers, John and Jack. They are both students at middle school. John is good at 5. He wants to help people at sea in the future. Jack paints very 6. He wants to be a painter. I have a sister too. Her name is Daisy. She likes 7 and dancing Very much. She 8 to be a singer.