题目

Boys_________ model planes to dolls, while girls _________ have dolls than model planes. A. would rather; prefer                     B. prefer; would rather C. would rather; would rather            D. prefer; prefer 答案：B写出下列反应的表达式：①红磷在空气中燃烧；②双氧水和二氧化锰的混合物；③铁丝在氧气中燃烧；④氯酸钾和二氧化锰加热 ．