_________(61)A.race B.paceC.speed D.step

1，－5，13，－29，______ A.－61 B.－39 C.39 D.61

61._________A. processesB. producesC. possessesD.

61._________A. enjoyedB. experiencedC. performedD

_________(61)A.race B.paceC.speed D.step

61._________A.. modificationB. detectionC. assess

_________(61)A.race B.paceC.speed D.step