阅读下列短文，从每题所给的四个选项中，选出最佳选项。

　　His name was Fleming, and he was a poor Scottish farmer．One day, while trying to make a living for his family, he heard a cry for help coming from a nearby bog(泥塘)．He dropped his tools and ran to the bog．There, trapped to his waist in black mud, was a terrified boy, screaming and struggling to free himself．Farmer Fleming saved the boy from what could have been a slow and terrifying death．

　　The next day, a fancy carriage pulled up to the Scotsman's surroundings．An elegantly dressed nobleman stepped out and introduced himself as the father of the boy Farmer Fleming had saved．“I want to repay you,” said the nobleman．“You saved my son's life．”

　　“No, I can't accept payment for what I did,” the Scottish farmer replied, waving off the offer．At that moment, the farmer's own son came to the door of the family hovel(陋屋)．“Is that your son?” the nobleman asked．“Yes,” the farmer replied proudly．

　　“I'll make you a deal．Let me take him and give him a good education．If the boy is anything like his father, he'll grow to a man you can be proud of．”

　　And that he did．In time, Farmer Fleming's son graduated from St．Mary's Hospital Medical School in London, and went on to become known throughout the world as the noted Sir Alexander Fleming, the discoverer of penicillin．

　　Years afterward, the nobleman's son was stricken with pneumonia(肺炎)．What saved him? Penicillin．

　　The name of the nobleman? Lord Randolph Churchill．His son's name? Sir Winston Churchill．

　　Someone once said, “What goes around, comes around．”

(1)

(2)

(3)

(4)