Which details from "The Oasis: Africa" best support the central idea that nature can be severe and unkind? Select each correct answer. “This was a day when fear laid his hand upon us, when each of us felt the knife at his throat.” "'Does the Effendi think I would desert him in his hour of need? But God is good, let us press on.'" "The Arabs were clearly dejected at not having reached the oasis, and several had already commenced to feel the pangs of thirst." "Clutch tight your water-skin on the desert, for there is no charity on the Sahara, and he that has no water shall not drink!"