A few years ago, I had the opportunity to play the character of Ronald McDonald for the McDonald's Corporation.
One day each month，we visited hospitals bringing a little happiness to the children there. But there were two rules placed on me during a visit. First, I could not go anywhere in the hospital  without permission. And second, I could not physically touch anyone within the hospital. They did not want me to carry germs(细菌)from one patient to another. Breaking either of these rules, I was told, I could lose my job. One day, as I was heading down a hallway and on my way home, I heard a little voice coming through a halfopened door，“Ronald，Ronald.”
I stepped in and saw a boy，about five years old, lying in his dad's arms, Mom with a nurse on the other side. I knew by the feeling in the room that the situation was grave. I asked his name. He told me it was Billy and that I did a few simple magic tricks for him. As I stepped back to say goodbye, he asked me “Ronald, would you hold me？”
At such a simple request, my heart was screaming, “Yes！”But my mind was screaming louder. “No！You are going to lose your job！”
“Hold me” was such a simple request, and yet I searched for any reasonable excuses that allowed me to leave, but none. It took me a moment to realize that in this situation, losing my job may not be the disaster I feared. Then, I picked up this little boy. He was so weak and so scared. We laughed and cried for 45 minutes. With tears in my eyes, I left them. Less than 48 hours later, I received a phone call from Billy's mom that Billy had passed away. She and her husband simply wanted to thank me for making a difference in their little boy's life.
Billy's mom told me shortly after I left the room. Billy looked at her and said, “Momma, I don't care any more if I see Santa this year because I was held by Ronald McDonald.”
For the record, McDonald's Corporation did find it out, but, given the situation，permitted me to go on with my job. I continued as Ronald for another year before leaving the corporation to share the story of Billy and how important it is to take risks.
The underlined word “grave” in Paragraph 3 means “________”.

A．weak

B．serious

C．interesting

D．exciting

When Billy asked the author to hold him, at first the author ________.

A．was unwilling to do so	B．was glad to do so
C．hesitated to do so	D．hurried to do so

What lesson did the author draw from his experience?

A．To amuse others is enjoyable.	B．To take risks is important.
C．To break rules is necessary.	D．To be fired is not fearful.

We learn from the story that ________.

A．the author left the corporation because he broke the rules

B．the author left the corporation because he didn't like the rules

C．the boy was quite happy with the experience with the author

D．the boy was quite happy with Santa at Christmas