A、90 B、130 C、525 D、230 D问题问的是男士一晚上要付多少钱。根据女士所说So, two single rooms at $ 40 a night and three double rooms at $ 50 a night 可知,男士一

W：Bright Star Hotel.
M：Good afternoon.My name is Martin.I’d like to book some rooms for tomorrow for a week.
W：OK.What kind of rooms would you like?
M：Two single rooms and three double rooms.
W：Sure, we have single rooms at $ 30，$ 40 a night and double rooms at $ 40, $ 50 a night.
M：Fine.I would like single rooms at $ 40 and double rooms at $ 50.
W：So, two single rooms at $ 40 a night and three double rooms at $ 50 a night.
M：Yes, that’s right.Thank you.
W：You’re quite welcome.
Q17：How long does the man book the rooms?
Q18：How many rooms does the man book?
Q19：How much will the man pay for one night?