____he is, ____ he can do something that grown-ups do.

   A. A boy as; but            B. Boy as; yet           C. A boy though; yet    D. Boy as; but

________he is, ________he can do something that grown-ups do．

       A．A boy as; but                                     B．A boy though; yet 

       C．Boy as; yet                                      D．Boy as; but

________ he is, ________ he can do something that grown-ups do.

[　　]

The train shakes back and forth, its wheels making a loud noise against the tracks．Outside the window the freezing cold of winter rules．The carriage is filled with cold, tired passengers．

Suddenly a little boy　 31　 his way through the grown―up legs and sits down by the window．He is all alone among the unfriendly grown-ups．What a brave child, I think．His father　 32　 to stay by the door behind us. The train begins to crawl into a tunnel. Then something very strange happens suddenly. The　 33　little boy slides down from his seat and leans his hand on my knee. For a moment, I think that he wants to　 34　 me and return to his father, so I help him to stand up. But instead he leans forward and holds his head up towards me. He wants to say something to me, I think．I lower my head to receive the message. Wrong again! What I do receive is a　 35　 kiss on the cheek.

The boy calmly returns to his seat, leans back and continues looking out of the window．I am　36　. What just happened? A child kissing unknown grown―ups on the train. How can anybody want to kiss such a man that has so much beard? Soon enough, all of my neighbors are certainly　 37　 . Nervous and a little surprised, we cast a look in the direction of the father. When he sees our questioning　38　as he gets ready for his stop, he offers a clue.

 “He’s so happy to be alive,” the father says. “He has been very sick..”

Father and son disappear into the crowd moving toward the exit. The doors close and the train goes on. On my cheek I can still　 39　 the child’s kiss―a kiss that has triggered(触发)some soul―search inside me. How many go around kissing each other from the joy of being alive? How many even give much thought to the privilege of living?

The little kisser taught us a sweet but serious lesson: Be careful you don’t let yourself　 40　 before your heart stops!