(2014·新课标ⅱ) joe simpson and simon yates were the first people to climb the west face of the siula grande in the andes mountains. they reached the top __1__， but on their way back conditions were very __2__. joe fell and broke his leg. they both knew that if simon __3__ alone, he would probably get back __4__. but simon decided to risk his __5__ and try to lower joe down the
