Question 11 is based on the passage you have just heard.

Passage One

    As some 2,320 miles in length, the Mississippi is the longest river in the Unites States. At some 1,000 miles, the Mackenzie is the longest river in Canada. But these waterways seem minute in comparison to the world’s two longest rivers—the Nile and the Amazon.

    The Nile, which begins in central Africa and flows over 4,100 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 Egypt depended for livelihood. As a means of transportation, the river carried various vessels up and down its length. (9) A journey through the unobstructed part of this waterway today would pass by the splendid Valley of the Kings, where the tombs of many of these ancient monarchs have stood for over 3,000 years.

    (10) Great civilizations and intensive settlement are hardly associated with the Amazon, (11) yet this 4,000-mile-long South American river carries about 20% of the world’s fresh water—more than the Mississippi, Nile and Yangtze combined. Other statistics are equally astonishing. The Amazon is so wide at some points that from its center neither shore can be seen. Each second, the Amazon pours some 55 million gallons of water into the Atlantic; there, at its mouth, stands one island larger than Switzerland. Most important of all, the Amazon irrigates the largest tropical rain forest on Earth.

11. What does the speaker say about the Amazon?

解析：A。本题目为细节题。问题为：关于亚马逊河，讲话人说了些什么？根据原文可知，这条4000英里长的南美洲河流承载着世界上20%的淡水，比密西西比河、尼罗河和长江的总和还要多。故正确答案为A。