their present channels.

　　1. The main idea of this passage is _____.

　　A.the Ice Age was a long period of time

　　B.great glaciers covered North America many years ago

　　C.changes in climate helped to melt the glaciers

　　D.how glaciers changed North America

　　2. The author states that all glaciers _____.

　　A. are two miles thick

　　B. form frozen lakes

　　C. are a million years old

　　D. move and slide

　　3. From the information in this passage we know that _____.

　　A. glaciers are destructive

　　B. all glaciers in the world move southward

　　C. the Mississippi-Missouri-Ohio system is larger than it was before the Ice Age

　　D. the Great Lakes are now smaller than they were before the Ice Age

　　4. The Ice Age lasted almost _____.

　　A. 1,000 years

　　B. 100 years

　　C.1,000,000 years

　　D. 11,000 years

　　5. In the last sentence, the word their refers to ______.

　　A. lakes

　　B. rivers

　　C. glaciers

　　D. systems

　　【答案解析】

　　1.答:D最佳【分析】A项只是第一自然段的一句话，不能概括全文，B项用词不准，原文有Cover almost all of upper half of North America并且many years ago用词也不准确。故排除B项。C项原文中未提及。

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