Many years ago，when I was fresh out of school and working in Denver，I was driving to my parents’ home in Missouri for Christmas. I stopped at a gas station(加油站) about 50 miles from Oklahoma City，where I was planning to stop and visit a friend. While I was standing in line at the cash register(收款台)，I said hello to an older couple who were also paying for gas.
I took off，but had gone only a few miles when black smoke poured from the back of my car. I stopped and wondered what I should do. A car pulled up behind me. It was the couple I had spoken to at the gas station. They said they would take me to my friend’s. We chatted on the way into the city，and when I got out of the car，the husband gave me his business card.
I wrote him and his wife a thankyou note for helping me. Soon afterward，I received a Christmas present from them. Their note that came with it said that helping me had made their holidays meaningful.
Years later，I drove to a meeting in a nearby town in the morning. In late afternoon I returned to my car and found that I’d left the lights on all day，and the battery(电池) was dead. Then I noticed that the Friendly Ford dealership—a shop selling cars—was right next door. I walked over and found two salesmen in the showroom.
“Just how friendly is Friendly Ford？” I asked and explained my trouble. They quickly drove a pickup truck to my car and started it. They would accept no payment，so when I got home，I wrote them a note to say thanks. I received a letter back from one of the salesmen. No one had ever taken the time to write him and say thank you，and it meant a lot，he said.
“Thank you” — two powerful words. They’re easy to say and mean so much.
小题1:
The author planned to stop at Oklahoma City________.
A．to visit a friend
B．to see his parents
C．to pay at the cash register
D．to have more gas for his car小题2:
The words “took off” underlined in Paragraph 2 mean “________”．
A．turned off
B．moved off
C．put up
D．set up小题3:
What happened when the author found smoke coming out of his car?
A．He had it pulled back to the gas station.
B．The couple sent him a business card.
C．The couple offered to help him.
D．He called his friend for help.小题4:
The battery of the author’s car was dead because________.
A．something went wrong with the lights
B．the meeting lasted a whole day
C．he forgot to turn off the lights
D．he drove too long a distance小题5:
By telling his own experiences，the author tries to show ________.
A．how to write a thankyou letter
B．how to deal with car problems
C．the kindheartedness of older people
D．the importance of expressing thanks
便可算出纸带的加速度为0.16m/s2。在未加砝码时都能测量出加速度，说明砝码盘质量提供了合外力