Lexile（蓝思）是衡量读者阅读水平和标识出版物难易度时使用的单位。蓝思难度的判断标准是词汇和句子长度，蓝思指数既方便学生找到合适的书，也可判读自己的阅读水平。蓝思最高值1700。
蓝思网站：www.lexile.com
把要读的书名输进去，就能得到相应的蓝思指数。
Step into Reading系列 100
Early I Can Read系列 100
Curious George系列 200
Nate the Great系列 200-480
Frod and Toad 300
Magic School Bus 系列 310-660
Magic Tree House系列 230-840
Gulliver's Travels 460
Of Mice and Men 630
Treasure Island 670
The Great Gatsby 670
Number the Stars 670
Charlotte's Web 680
The Grapes of Wrath 680
The Trumpet of the Swan 750
Winnie the Pooh 790
The Catcher in the Rye 790
A Tales of Two Cities 790
Stuart Little 890
Charlie and the Chocolate Factory 810
Wuthering Heights 880
Harry Potter系列 880-1030
The Lion, the Witch and the Wardrobe 940
Jane Eyre 1040
Pride and Prejudice 1060
Nineteen Eighty-Four 1090
Gone With the Wind 1100
Animal Farm 1170
To Kill a Mockingbird 1120
The Story of Mankind 1260
