Although it is cold outside in winter, we have heating systems to keep us warm indoors in most parts of North China and in South China, they at least have air conditioners or electric radiators. But how did ancient people    1    China keep warm without modern equipment?

During the Qin and Han dynasties, temperature adjustable rooms    2     (appear) in royal families. Royal courts had    3     (large) and more advanced rooms, called the “temperature adjustable halls”. And    4     (palace) such as Changle Palace in Weiyang Palace in Western Han dynasty had temperature adjustable halls. Changle Palace, which was    5     (original) used as the government's “office building” and “president suite” for Liu Bang, not only had heating room for winter but also rooms for     6     (cool) down in summer.

A comfortable temperature could help preserve books,     7    made these halls were good places to store books and provide a better environment for reading.

    8    is said that the “temperature adjustable hall” was built with the wall which    9     (cover) with prickly-ash mash (花椒泥). Tapestries (挂毯) on the wall, a thick blanket on the ground and wild goose feather-made curtains were also used    10     (keep) cool air outside.