Water, water everywhere. It lasted almost two months, but in August it ended. It left 45 people dead and $10 billion worth o

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问题     Water, water everywhere.
    It lasted almost two months, but in August it ended. It left 45 people dead and $10 billion worth of damage in nine states of the US@[A]@It was quite a big Mississippi flood ever recorded.
    In St. Louis, Missouri, 9,000 people were forced to leave their homes while the city was in danger. St. Louis is just downriver from the points where the Missouri and Illinois Rivers flow into the Mississippi. All the three rivers were flooding. But the city escaped the worst when levees broke upriver. A levee is built of river sand and clay.
    Eleven miles of flood walls were built in the late 1960s. The walls are 18 inches thick and 5 to 22 feet high. They were designed to protect against a 52-foot flood. In St. Louis, water almost reached the top of flood walls. It measured 49.4 feet.

选项 A、was the heaviest one in the history
B、happened in Missouri and Illinois states
C、happened in less than 20 percent of the states of the USA
D、was recorded several times

答案C

解析 题干问:“文章中提到的洪水情况是什么样?”文章说这次洪水是有记录以来很大的一次,而不是历史上最大的一次,所以答案A不正确。洪水发生在美国的9个州,所以选项B说得不全面。美国共有50个州,9个州的数量小于美国州总数的20%,所以选项C是正确的。这么大的洪水是有记录以来的第一次,所以说它被记录了几次是错误的,D错误。
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