题目内容：
根据下列文章,请回答题。MilkThat Paid a Medical BillOne day, a poor boy who was selling goodsfrom door to door to pay his way through school found he had only one thindime(1o分钱)left，and he was hungry．He decided he would ask for a meal at thenext house．However, he lost his nerve when a lovely young woman opened the door．Insteadof a meal he asked for a drink of water．She thought he looked hungry so shebrought him a large glass of milk．He drank it slowly。and then asked，“How muchdo I owe you?” You don't owe me anythin9，”she replied．“Mother has taught usnever to accept pay for a kindness．”He said，“Then I thank you from my heart．”
As Howard Kelly left that house，he not onlyfelt stronger physically, but his faith in God and man was strong also．He hadbeen ready to give up and quit．
Years later that young woman becamecritically ill．The local doctors were baffled(感到困惑)．They finally sent her tothe big city,where they called in specialists to study tier rare disease。Dr．HowardKelly was called in for the consultation．When he heard the name of the town shecame from，a strange light filled his eyes．Immediately he rose and went down thehall of the hospital to her room．Dressed in his doctor's gown he went in to seeher．He recognized her at once．He went back to the consultation room determined todo his best to save her life．From that day he gave special attention to thecase．After a longstruggle the battle was won．
Dr．Kelly requested the business office topass the final bill to him for approval．He looked at it；then wrote something onthe edge and the bill was sent to her room．She feared to open it。for she wassure it would take the rest of her life to pay for it all．Finally she looked，andsomething caught her attention on the side of the bill．She read these words：“Paidin full with one glass of milk．”Tears of joy flooded her eyes as her happy heartprayed：“Thank You。God，that Your love has spread abroad through human hearts andhands。”Theboy sold goods from door to door because A．he wanted to help support his famil
B．heneeded money for schoo1．
C．he had to pay back a student loa
D．hedid not have enough pocket mone
参考答案：
答案解析：