阅读下面短文，掌握其大意，然后从各题所给的A、B、C和D项中，选出最佳选项。
My neighbor is a doctor. He and his wife are
some of the1people I have ever met. A few years ago,
we started this kind of "favor war" where one of us would do something
kind for the other, such as2the driveway or building a shed, and next
time the other would3to top it with another favor.
Yesterday morning, it snowed heavily and I remembered
he shoveled (铲) my driveway for me. So I took out my shovel and took care of both our
driveways and sidewalks because it was my turn to do a favor4.
It took a while but I finished it and got into my car for work.
That night I got a5on
my door, it was my neighbor. He immediately shook my hands and thanked me for shoveling
his driveway and sidewalk, so that he was able to get to work earlier and6a
boy.
"As soon as I started the car early this
morning, a call came through that a young boy in our neighborhood was seriously
ill.7, my partner and I were only about 2 minutes
away, but the closest ambulance 10 minutes," added he. "A young boy got
to live his life because you did me the favor."
It wasn't too much8to
shovel a driveway, but what I did got a young boy to see his family again, go back
to school again and live his life again.9favor is too small. Even the
smallest favor can make the biggest10. One favor will always be followed by another.
