题目

Rewrite the following sentences as required（根据所给要求，改写下列句子。每空格限填一词。）【1】A fire broke out in a department store yesterday. （改为一般疑问句）__________ a fire __________ out in a department store yesterday?【2】People can donate money, food and medicine to victims through the Red Cross. （对划线部分提问）__________ __________ people donate money, food and medicine to victims?【3】The trousers were too long, so I shortened them.（保持句意基本不变）The trousers were too long, so I __________ them __________.【4】T已知f(α)＝ (1)化简f(α)； (2)若α是第三象限角，且cos(α－)＝，求f (α)的值．