单选题This passage is mainly about ______.A deforestation in the rural agricultural societiesB use of rice husks as an insulation materialC design and use of a solar ovenD maintenance of temperature in a solar oven
题目
单选题
This passage is mainly about ______.
A
deforestation in the rural agricultural societies
B
use of rice husks as an insulation material
C
design and use of a solar oven
D
maintenance of temperature in a solar oven