听力原文：M: Uh, where am I? W: Excuse me. Do you need any help? M: Nah, I... I'm just looking.., well... Uh, well, actually.., yeah. Um... [23] I want to go to the science museum, but I've been lost for the past few hours, and [24] I can't make heads or tails of these ticket machines. W: Ah, well, just press this button. And from here, it's a dollar fifty. M: Okay. W: Then, get on the train at Platform. No. 4. M: Alright. Oh, how often do the trains come around this time of day? W: Usually, [25] they come about every six minutes. M: Okay. And where do I get off the train? W: Get off at State Street Station, three stops from here. M: Okay. I've got it. Thanks for your help. W: No problem. Good luck. (20)