The Longman Dictionary of American English is unique because it has been written using the Longman Defining Vocabulary． Other dictionaries use high﹣level language in their definitions which forces students to look up the defining words as well as the words they're looking up in the first place． Only the Longman Dictionary of American English uses a defining vocabulary made of the 2，000 words that make up the intermediate﹣level student's most used vocabulary．

　　What are the other features？

　　The Longman Corpus Network is a powerful group of databases consisting ofmillions of words． The Longman American Written Corpus contains over 110 million words taken from newspapers， journals， magazines， best﹣selling novels， technical and scientific writing， and coffee﹣table books．

　　Longman compilers （编者）use this computerized word bank to acquire a new depth of knowledge about words， usage， prepositions， the latest language trends' and grammatical patterns using up﹣to﹣the﹣minute technology．The written and spoken corpuses assure that this edition of the Longman Dictionary of American English will provide the most accurate and up﹣to﹣date assistance to students who want to speak and write American English．

1. Longman Dictionary of American English is mainly for ．

A. low﹣level learners

B. learners of different levels

C. advanced﹣level learners

D. intermediate﹣level learners

2. The main purpose of this passage is to ．

A. tell readers why American English is more popular

B. inform students of how they can find the grammar patterns

C. guide readers how they can use the dictionary on computer

D. explain why the dictionary is different from other dictionaries

3. The following about the dictionary are all correct EXCEPT that ．

A. the definitions are easy to read

B. it is made up of 2，000 words