容易：

A Separate Peace

Of Mice and Men

The Pearl

The Old Man and the Sea

中等：

The Grapes of Wrath

All Quiet on the Western Front

The Chosen

The Good Earth

难点的：

Memoirs of a Geisha by Arther Golden

Fahrenheit 451 by Ray Bradbury

Having Our Say by The Delaney Sisters

1984 by George Orwell

Night by Elie Weisel

Slaughterhouse Five by Kurt Vonnegut

Catch 22 by Joseph Heller

Portrait of the Artist as a Young Man by James Joyce

Heart of Darkness by Joseph Conrad

Emma by Jane Austen

Cry of the Beloved Country by Alan Paton

Invisible Man by Ralph Ellison

Kite Runner by Khaled Hosseini

The Color Purple by Alice Walker

PS:推荐在 amazon.com 买书

Nathaniel Hawthorne：The Scarlet Letter，Edgar Allen Poe：The Masque of the Red Death，

这个问题非常好哦。这里推荐几本：Lord of Flies, Animal Farm, All quiet in the western front, The great gatsby, Rasin in the sun等等...如果英语功底好的，还可以读读莎士比亚

Great Gatsby
Old man and the sea
Hunger Games
The Lord of the Ring

To Kill a Mockingbird
Pride and Prejudice
Tess of the D'Urbervilles
The Old Man and the Sea
Lord of the Flies

可以看看这几本书， MSNBC 里面有介绍的，http://today.msnbc.msn.com/id/43945489/ns/today-back_to_school/t/books-you-really-should-have-read-high-school/#.T3Co1NlkgTA

我以前读书的时候也看过一些，没有全部看完。下面这几本比较记得清楚。
The Adventures of Huckleberry Finn
The Great Gatsby
The Scarlet Letter
Frankenstein
The Catcher in the Rye

Hunger Games
The Help