Which detail from “the oasis: africa” best supports the central idea that nature can be severe and unkind? “lulled by the soft music of the brook, in infinite content, i sank back on to the soft carpets, and was soon in a dreamless slumber.” “footsore and weary, but every before us the pointing finger of the arab sheikh, and his ceaseless: ‘on, on.’” “misery of hunger, torture of thirst; unending discomfort of swarming lice.” “in a short time we were on the fringe of one of the most delicious spots i have ever seen.”