Question

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(滑動). They pushed down giant trees in their paths and scraped(刮削)the earth bare(光禿禿)of soil.Many animals moved farther south to escape.Others stayed and were destroyed.

When winters of little snow came,the summer suns into the edges to 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.Itsmelting formed the Great Lakes.These lakes are today little changed from their early sizes the glaciers.This is the Mississippi Missouri Ohio system.These rivers were miles wide at first.Through the years they settle into their present channels.

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 systems 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

Answer 1

1----5    DDACB      

解析:

1.這是一】閱讀理解第一段敘述四大冰川覆蓋了北美的北部地區(qū)；中間兩段主要敘述了冰川的變化及對土地的改變；最后一段說明了北美的一些地形是由于冰川造成的。所以答案為冰川怎樣改變了北美。答案為D。

2.這是一道推斷題。盡管作者寫了冰川存在的時間、厚度，然而，主旨是寫冰川對地形的改變，而造成這種地形改變的原因是冰川的滑動。答案為D。

3.這是一道主旨題。從第二、三段可以知道冰川是具有破壞性的，帶走土壤和樹木，迫使動

物遷移；B選項中的“all”帶有絕對性，文中作者并未如此表述；C選項與最后一段的倒數(shù)第二句話相矛盾；D選項中提到的“Great Lakes”在最后一段的第二、三句中說明Ice Age 前

后他們的大小并未作很大的改變。答案為A。

4.這是一道計算題。第一句話“About one million years ago,the Ice Age began.”告訴

我們Ice Age延續(xù)的時間大約為一百萬年。答案為C。

5.這是一道所指題。最后兩句話“These rivers were miles wide at first.Through the years they settle into their present channels.”說明“their”指的是rivers，而不是指lakes。答案為B。