A、Sugar. B、Both A and C C、Vitamin C D、Salt. B题目询问女士建议男士往水里放什么。由对话的相关内容“Put a little sugar andvitamin C in the water．”可知应放糖和维生素C，

M: How much are the carnations and the roses?
W: One dollar for each carnation and(9)one and a half for each red rose.
M:(9)Then I’d like a dozen red carnations and half a dozen red roses.
W: I bet it’s for your mother,(8)as it’s Mother’s Day today.
M: Well, not completely true.(8)It happens to be her birthday.
W: Oh, really? I guess she must be very happy to receive these beautiful carnations from you.
M: Yeah, she will. She really likes flowers. So I buy her some every year. I’d just wish they would stay fresh longer than they do.
W:(10)Put a little sugar and vitamin C in the water. They’ll stay fresh for days.
M: Really? I’ll tell my mother. And thanks for your suggestion.
W: That’s all right. Happy birthday to your mother!
Questions 8 to 10 are based on the conversation you’ve just heard.
8. What day is it today?
9. How much does the man spend on red roses?
10. What does the woman suggest the man put in the water?