6 月英语六级真题和答案听力Passage 1 At some 2300 miles in length, the Mississippi is the longest river in the United States
At some 1000 miles, the Mackenzie is the longest river in Canada
But these waterways seem minute in comparison to the world’s 2 lengthiest rivers: the Nile and the Amazon
The Nile which begins in central Africa and flows over 4100 miles north into the Mediterranean hosted one of the world’s great ancient civilizations along its shores
Calm and peaceful for most of the year, the Nile used to flood annually, thereby creating, irrigating and carrying new topsoil to the nearby farmland on which ancient Egypt depended for livelihood
As a means of transportation, the river carried various vessels up and down its length
A journey through the unobstructed part of this waterway toda