隔热耐火材料
参考答案：
是指气孔率高，体积密度低，热导率低的耐火材料。
---What about going hiking this afternoon, Simon?
--- I prefer ______ to _________ , it is too hot.
A．going hiking, stay at home
B．to stay at home, hike
C．to hike, stay at home
D．staying at home, going hiking
