A、It’s less expensive. B、It’s more comfortable. C、It’s faster. D、It’s more direct. C这道题要考生对“since”这类表示原因的词要引起注意，并且考生应当特别留心"but"这

M: You see,a marine biologist is now appearing on the screen.
W: Yeah.We are now being taken on a tour familiarizing with life in the salty depths.It’s an interesting tele teaching lesson.
Q: What are the man and woman doing?

M: Since it’s the rush hour, let’s take tile subway.
W: OK. It’ s not as direct as the bus ,but it’ s faster and there will be less chance of a traffic jam.
Q: Why do the man and the woman decide to take the subway?