阅读下列短文,从下面每小题的A、B、C、D四个选项中选出最佳选项。 Though very cold temperatures continued to trouble the US in January this year, an act of kindness warmed everyone. In Chicago a young man provided a homeless old man with the proper footwear—from his own feet. Jessica Bell, a passenger, saw everything and posted the story on Facebook.
According to her Facebook post, Bell was taking the train home on Friday when she noticed a homeless old man sitting across from her. Bell wrote that the man was wearing tattered shoes, and many pairs of socks to keep his feet warm, but there was blood seeping (渗) through.
On the same train was another man. According to Bell's description, he was young, carrying a bag and a suitcase. He was wearing big black snow boots (靴子), which looked new and expensive. They were built for a Chicago winter. Then he did a good thing.
Bell described that the young man took off his own boots and passed them to the old man. He opened his suitcase and gave him a pair of socks as well. Then the young man put on a different pair of shoes—not as nice as the ones he had given away. He told the old man to try them on and helped him clean his feet and change into the new boots as quickly as he could, and then left the train.
At the end of her post, Bell wrote. "I love my city. I love that in a time and place where a quiet act of kindness appears without warning." The story has received thousands of comments (评论), with many people describing how moving they found the act of kindness. One wrote, "We can all learn from that young man." Others are thanking Bell for sharing the story—there are still good people in the world.