One sunny Monday，I decided to go for a walk with my husband．I was wearing a special diamond（钻石） ring that day． It was my 20th birthday gift from my grandmother．

    As we were walking in the park， I unintentionally looked down at my hand and found the diamond on my ring was missing． I was really worried so I went back to look for it． I knew how small the chances were of finding it， but I still wanted to give it a try．

    As I was fixing my eyes on the ground， I ran into an old gentleman by accident．"What's wrong，love？" he asked nicely． "Sorry that I ran into you，"I said，"But I lost something． I'm really worried． "I explained about the missing diamond and showed him the hole in my ring．"That's not going to be easy to find it， "he said． "Tell you what， love， I take a walk here every day． I'll keep my eyes open for it． "I thanked him expecting nothing．

    A few days later， my husband and I met the old man again in the park．"Guess what， "he said． "I found your diamond! "I couldn't believe what I saw when the gentleman handed the diamond back to me．Then my husband offered him money for his help， but he refused．

    The old man could have easily kept the diamond or sold it， as it's worth several thousand dollars．But he didn't． All I have to do is to look at my ring and remind myself that there are still kind and generous souls out there． Now thanks to this man， I'll spend more time trying to do something nice for other people．

（1）The relationship between the lady and the old gentleman is　　．

A． husband and wife

B． father and daughter

C． owner and thief

D． strangers

（2）The underlined word "unintentionally" in Paragraph 2 probably means"　　"．

A．有意地

B．无意间

C．故意地

D．不小心

（3）After the gentleman found the diamond， he　　．

A． called 911 to look for the lady

B． sold the diamond for a lot of money

C． kept the diamond to himself

D． returned it when he met the lady

（4）According to the passage， we can know the following EXCEPT that　　．

A．The diamond ring is a special gift for the lady

B． the lady lost her ring while she was walking

C． she knew it was difficult for her to find the diamond

D．She was surprised when the gentle handed the diamond back

（5）The main idea of the story is　　．

A． We can trust people who offer help

B． Strangers can be very nice sometimes

C． Keep an eye on your own things

D． Keep your eyes on the road when you walk on the street