試題詳解

50.A: Kathy, what do you do to stay in shape? B: I exercise a lot. Instead of getting around by bus or MRT, I walk to get around. A: ________________ If I do this, I can not only exercise but also save some money. 
(A)I think you’re crazy.
(B)But it may take a lot of time. ƒ
(C)That sounds like a good idea.
(D)Staying in shape is impossible.