题目

设a表示向东3m，b表示向北4m，c表示向上5m，则( )A. a-b+ c表示向东3m, 向南4m, 向上5mB. a+ b-c表示向东3 m, 向北4 m, 向上5 mC.2a-b+c表示向东3m,向南4m,向上5mD.2(a+ b+ c)表示向东6m,向北8m,向上5m 答案：A_ _What are you going to do this afternoon?_ _My hair is too long. I want to get my hair__________.A．cutB．to cutC．longD．too long