单项选择题 建筑石膏具有多孔性，这导致其（）。

单项选择题 听力原文：M: Oh, no! It's twelve o'clock already and I haven't finish writing this report.W: Don't worry. That clock is twenty-five minutes fast, you still have time to do it.When does this conversation take place?A．At twelve o'clock.B．At twelve twenty-five.C．At eleven twenty-five.D．At eleven thirty-five.

单项选择题 听力原文：W: I need to make a hotel reservation for my father.M: How about calling the travel agency?What does the man advise the woman to do?A．To go to the hotel with her father.B．To call the hotel.C．To talk to a travel agent.D．To stay at a hotel.