题目

________，you need to give all you have and try your best． A．Being a winner                                   B．To be a winner C．Be a winner                                             D．Having been a winner 答案：B15、如图，A，B，C，D，E，P，Q，R，S，T是构成五角星的五条线段的交点，则图中共有线段30条．