解析：选D　细节理解题。根据Great Expectations 部分中的Hardcover: 400 pages可知，Great Expectations是精装书，其他三本书均为简装书。

　　4．If you want to get free shipping, you should buy ________.

　　A．Little Women and Great Expectations

　　B．Little Women and The Grapes of Wrath

　　C．The Grapes of Wrath and The Adventures of Tom Sawyer

　　D．Great Expectations and The Adventures of Tom Sawyer

　　解析：选B　数字计算题。根据文末"FREE shipping on orders over ＄30" 可知，购书满30美元免运费，Little Women 和 The Grapes of Wrath 两本书总售价为 31.32 美元，符合免运费要求。

　　B

　　In the summer of 1862, a young man belonging to a Vermont regiment was found sleeping at his post. He was tried and sentenced to be shot. The day was fixed for the execution (处决), and the young soldier calmly prepared to meet his fate.

　　Friends who knew of the case brought the matter to Mr Lincoln's attention. It seemed that the boy had been on duty one night, and on the following night he had taken the place of a comrade who was too ill to stand guard. The third night he had been again called out, and, being exhausted, he fell asleep.

　　As soon as Mr Lincoln understood the case, he signed a pardon (赦免令), and sent it to the camp. The morning before the execution arrived, Mr Lincoln had not heard whether the pardon had reached the officers in charge of the matter. He began to feel uneasy. He ordered a telegram to be sent to the camp, but received no answer.

　　As last, feeling that he must know that the boy was safe, he ordered a carriage and rode rapidly ten miles over a dusty road and beneath a hot sun. When he reached the camp, he found that the pardon had been received and the execution had been called off.

　　The soldier was set free, and his heart was filled with lasting gratitude. When the campaign opened in the spring, the young man was with his regiment near Yorktown, Virginia. They were ordered to attack a fort, and he fell at the first volley (齐射) of the enemy.

　　His comrades caught him up and carried him bleeding and dying from the field."Bear witness，" he said, "that I have proved myself a brave soldier, and I am not afraid to die." Then, making a last effort, with his dying breath he prayed for Abraham Lincoln.

　　语篇解读：本文讲了一件林肯与一位年轻的士兵之间关于知恩图报的故事。

5．The young soldier was sentenced to death because________.