"I'vechangedmymind．Iwantedtohaveacamera，butnowIwantmydaddyback．"LucienLawrence'slettertoFatherChristmas，writtenafterhisfatherhadbeenkilledoutsidehisschoolgate，musthavetouchedeveryheart．Lucienwen
"I've changed my mind．I wanted to have a camera，but now I want my daddy back．"Lucien Lawrence's letter to Father Christmas，written after his father had been killed outside his school gate，must have touched every heart．Lucien went on to say that without his father he couldn't see the stars in the sky．When those whom we love leave us，we cannot see the stars for a while．
But Lucien，the stars are still there，and one day，when you are older and your tears have gone，you will see them again．And，in a strange way，I expect that you will find your father is there too，in your mind and in your heart．I find that my parents，long dead now，still appear in many of my dreams and that I think of them perhaps more than I ever did when they were alive．I still live to please them andI'm still surprised by their reactions（反应）．I remember that when I became a professor，I was so proud，or rather so pleased with myself，that I couldn't wait to send my parents the message．The reply was a long time in coming，but when it did，all Mother said was"I hope this means that now you will have more time for the children!"I haven't forgotten．The values of my parents still live on．
It makes me pause（暂停） and think about how I will live on in the hearts and minds of my children and of those for whom I care．How many people would want me back for Christmas？It's a serious thought，one to give me pause．I said to myself silently，sometimes，in the dead of night．Yet I know the death comes to us all，and sometimes comes suddenly．We must therefore（因此） plan to live for ever，but live as if we will die tomorrow．We live on，I'm sure，in the lives of those we loved，and therefore we should have a care for what they will remember and what they will treasure．If more parents knew this in their hearts to be true，there might be fewer deaths on our streets today．
56．According to the whole text we can see that the first paragraph___．
A．raises the subject of the text
B．s