题目

Hollywood movies are regularly filled with crime and violence. They can be exciting films but sometimes all you want is a little light-hearted entertainment.Have you heard of Bollywood? All singing, all dancing and unrealistic, it is the perfect alternative to normal Hollywood movies. Bollywood is the Indian film industry, based in Mumbai, formerly known as Bombay.【小题1】Yet Bollywood is the largest producer of films in the world. This year the Indian Filmgare Awards, Bollywood's Oscars, turn 50 years old.The typical Bollywood movie usually has the following ingredients: a cup of romance根据所学知识，写出下列物质的化学式：①双氧水________________ ② 生石灰 _____________③氢氧化钙______________ ④四氧化三铁____________