题目

According to the news report, ______ have been injured in the big forest fire.   A. many a firefighter                 B. more than one firefighter   C. a great many firefighters        D. a good number firefighters   答案：C如果一个三角形的三条高的交点恰好是该三角形的一个顶点，则该三角形的形状为（    ）。