题目

Daniel Brown was just five years old when he climbed into the family car and let it roll away down the road. He was only three when he flooded the kitchen. His mother, Angela Brown, is in despair. She is very busy looking after her new baby, a little girl called Laura, as well as Daniel. She told us, “Daniel is so full of curiosity.”At that moment, we hear a huge crash and then silence. We go upstairs and find Daniel crawling out of a wardrobe(衣橱)he has pulled over onto the floors, with a book in his hand.“It’s for you, Mum,” he says and looks up at his mum and smiles. Seven-year下列反应中必须加入氧化剂才能进行的是A．KClO3→O2B．Cu 2＋→ CuC．Fe+2→Fe+3D．CuO→CuCl2