题目

Look at the girl. ______is my good friend and ______birthday is on September 11th. A . He; his B . He; he's C . She; her D . She; she's 答案：C皮划艇是我国的奥运优势项目之一，比赛中，运动员一手支撑住浆柄的末端（视为支点），另一手用力划桨，此时的船桨是（ ）A．等臂杠杆B．费力杠杆C．省力杠杆D．省功杠杆