未知题型 分户热计量采暖系统的特点是（ ）。

未知题型 热循环水泵的结构形式是（ ）。

单项选择题 听力原文：M: My parents will visit me next Monday. I'm looking for an apartment for them these days.W: Why not go to the overseas-students housing office to check their list of currently available apartments before seeing various landladies?Q: What does the woman suggest the man to do?(18)A．To go to the overseas-students' housing office for help.B．To check the list of the available apartment on the Internet.C．To see different landladies so as to find a satisfying apartment.D．To check out an apartment for his parents.