12．
A mother wanted to encourage her son to play the piano．She bought tickets to the concert of a great pianist．When the evening arrived，they found their seats near the front of the concert hall and looked at the big piano waiting on the stage（舞台）．Soon the mother found a friend to talk to and her son ran off．
At eight o'clock，the lights in the hall became weak，and the concert was set to start．The mother began to look for the boy．Then，she saw her 6-year-old son on stage．He was on the piano bench playing Twinkle，Twinkle Little Star．
The mother was very amazed．Before she could get her son back，the famous pianist himself was on the stage and quickly moved to the piano．
"Don't stop．Keep playing，"he said kindly to the boy．The great pianist reached down with his left hand and began filling in the bass （低音部） part of the song．Soon，his right arm reached around the other side and played a beautiful piece of music．Together，the old pianist and the little boy impressed people with their beautiful music．
In all of our lives，we receive helping hands-some we notice，some we don't．Equally we ourselves also have lots of chances to give a helping hand to others-sometimes we want people to know，sometimes we don't．Little of what we all achieve comes without others'help．What we receive we should give back．
44．The mother took her son to the piano concert becauseC．
A．her friend sent them two tickets
B．the pianist invited them there
C．she wanted to develop his interest in piano
D．her son liked the pianist very much
45．When the mother found her son playing on stage，she feltD．
A．happy
B．encouraged
C．interested
D．surprised
46．What did the pianist ask the boy to do？B
A．To go back to his mother．
B．To keep playing the piano．
C．To play the bass part of the song．
D．To watch him play instead．
47．What does the story tell us？A
A．It is good to give a helping hand to others．
B．Great people always like to help others．
C．It is important to give a child a lesson on stage．
D．A mother should take good care of her child．
What should you do if there is a fire at school？Do you know how to protect yourself in a large crowd？Every year since 1996，on the last Monday of the last week in March，the 
