A：OH一、F—、O2—、Ne
B：CH4、NH3、H2O、HF
C：NH4+、Na+、H3O+、PH4+
D：F一、O2一、Mg2+、A13+
—The Dragon Boat Festival is coming. I'm going to give a talk about it to the exchange students.
— Great! But don't forget to tell them _________.
第一段中作者集中描述了这种马的两点品格：____、____。
