6．I went home one Saturday afternoon in the autumn of 1993to get some work done in the garden．While sweeping leaves on the ground，my five-year-old son Nick came over and asked me to write something on a piece of paper to make a sign for him．
"What for？"I asked．
"I'm going to sell some of my stones，"he answered．
Nick was fascinated with stones and had collected many stones from all over．"I'm busy to do
that for you．Go and ask your mum for help．"I said．
A short time later，Nick returned with a sign，reading，"Stones．One Dollar Each"．He took the sign，a small chair and four of his best stones and walked to the road in front of our garden．There he put the stones in a line and sat down on the chair．
After half an hour，nobody passed by．I walked to him and asked him to go back，but he didn't．
Another half hour later，a small car came down the road．I watched as Nick stood up，holding his sign up．A woman rolled down a window and read the sign．I couldn't hear their talk，but I saw the woman turn to the driver and the man reach for his pocket．
I sat in the yard，as Nick ran to me．Waving the dollar，he shouted，"I told you I could sell one stone for a dollar-if you believe in yourself，you can do anything．"
49．The writer didn't help his son becauseC．
A．his wife is better at making a sign
B．he didn't know what to write
C．he was busy sweeping leaves
D．he didn't want his son to sell the stones
50．Nick was a boyB．
A．who was kind
B．who had a strong mind
C．who was honest
D．who had many hobbies
51．The best title for this passage isA．
A．My son's first sale
B．Let's collect stones
C．How to sell a stone
D．My son's hobby
52．From the story we can know thatD．
A．the story happened in spring
B．the car was driven by a woman
C．Nick spent half an hour selling one stone
D．the father might be moved （感動） by his son．
