TheRiverofDoubt_英文散文

　at once an incredible adventure narrative and a

　penetrating biographical portrait, the river of

　doubt is the true story of theodore roosevelt's

　harrowing exploration of one of the most

　dangerous rivers on earth.

　the river of doubt-it is a black, uncharted tributary

　of the amazon that snakes through one of the

　most treacherous jungles in the world. indians

　armed with poison-tipped arrows haunt its

　shadows； piranhas glide through its waters；

　boulder-strewn rapids turn the river into a roiling

　cauldron.

　after his humiliating election defeat in 1912,

　roosevelt set his sights on the most punishing

　physical challenge he could find, the first descent

　of an unmapped, rapids-choked tributary of the

　amazon. together with his son kermit and brazil's

　most famous explorer, c？ndido mariano da silva

　rondon, roosevelt accomplished a feat so great

　that many at the time refused to believe it. in the

　process, he changed the map of the western