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发布时间：2006-06-22 00:08     点击：

1. Many ecologists believe that lots of major species in the world are on the________ of extinction.(05/01)

A) margin                                   B) border

C) verge                                      D) fringe

2. Any salesperson who sells more than the weekly ________ will receive a bonus.(05/01)

A) ratio                                      B) quota

C) allocation                               D) portion

3. He suggested that we put the scheme into effect, for it is quite_____.(04/01)

A) probable                                 B) sustainable

C) feasible                                   D) eligible

4.This book is about how these basic beliefs and values affect important_____ of American life.(04/01)

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