44．What's the main idea of the text?

　　A．The Mississippi River Floods America's Heartland.

　　B．New Orleans is attacked by one disaster after another.

　　C．The Morganza Spillway plays a great role in controlling floods.

　　D．The natural disasters cause huge loss in America each year.

　　答案　A　[主旨大意题。结合第一段的主题句“The Mississippi River flows down the middle of the United States to the Gulf of Mexico”可知本文主旨。]

　　45．The serious flooding in America ________.

　　A．made 25,000 people homeless

　　B．was taken to another river system

　　C．explore a three­kilometer­wide hole

　　D．was caused by melted snow and heavy rains from the north　

　　答案　D　[细节理解题。由首段“Right now，melted snow and heavy rains from the north are moving south.It has been the worst flooding in eighty years in states along the Mississippi”可知，美国中部地区遭受的最严重的一次洪涝灾害是由于暴雨及积雪融水造成的。]

　　46．We can infer from the passage that it had been ________ years since Morganza

　　Spillway was used last time.

　　A．28

　　B．38

　　C．10

　　D．5

　　答案　B　[推理判断题。根据第四段最后一句“The spillway was used only once in 1973.”可推知，距上次泄洪道使用已经38年了。]

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