5.【分析】这一道细节题。通过文章的第五段便可以知道D为最佳答案。
6.【分析】这是一道归纳题。文中几处都谈到大火漫延的原因,即:风大、木制结构的房子、密集的房屋设置。故B是最佳答案。
B
About one million years ago, the Ice Age began. The Ice Age was a long period of time in which four great
glaciers (冰川) pushed southward to cover almost all the upper half of North America, and then melted away. Each glacier was a thick sheet of ice and snow that spread out from a center near what is now Hudson Bay in Canada. The winters were long, and the cool summers were too short to melt much of the ice and snow. The ever-growing sheet built up to a thickness of two miles at its center.
As all glaciers do, these great glaciers slid (滑动). They pushed down giant trees in their paths and scraped (刮削) the earth bare (光秃秃的) of soil. Many animals moved farther south to escape. Others stayed and were destroyed.
When winters of little snow came, the summer suns cut into the edges of the ice sheets. As the glaciers melted, rocks, soil and other things that had mixed with the ice and snow were left. New hills, lakes and rivers were formed.
The last of the great glaciers began its melting about 11,000 years ago. Its melting formed the Great Lakes. These lakes are today little changed from their early sizes and shapes. The largest of the North American river systems was also influenced by the glaciers. This is the Mississippi-Missouri-Ohio system. These rivers were miles wide at first. Through the years they settled into
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