单项选择题
[听力原文] M: How much is the medicine W: Let me see. $15.19 It’s too expensive!
A.$50.19. B.$15.90. C.$50.90. D.$15.19.
A.One. B.Two. C.Three. D.Four.
A.30 minutes. B.37 minutes. C.7 minutes. D.23 minutes.