Please check this PDF if you are interested. Try searching for "CRICHTON" & "PROTECTED" in the PDF. The PDF is in Chinese I guess, so I dint understand much but the answers of the Section-1 & Section-4 of Listening match :)...
I have written Protected, Evironment, Diseases, Poison (some people saying Gun) , Forests, Potatoes, Winter, Population, Density(some say Hunting), Crops