121个人排成一排，请问站在中间的是( )
A．第59个
B．第60个
C．第61个
D．第63个
参考答案：C
声音和光在空气中的传播速度分别约为340m/s和3×108m/s．在百米赛跑时，如果计时员在听到发令枪响时才开始计时，则计时的时间比运动员实际跑的时间______（选填“多”或“少”）了______s．
According to the regulations for lifeboat falls，which action must be taken with the falls no later than 5-year intervals?（）
A.Proof tested
B.End-for-ended
C.Renewed
D.Weight tested
