People sometimes like to read stories of dogs very much.They

People sometimes like to read stories of dogs very much.They think that dogs are much cleverer than cats,sheep,cows or other animals in their homes.
One of my close friends,Bob,has a very large police dog named Jack.Every Sunday afternoon,Bob and Jack have a walk in the park nearby.Jack likes these walks very much.One Sunday afternoon,I paid a visit to my friend.I stayed there for a long time and my friend and I had much more talk with each other than ever before.Soon it was time for them to take a walk in the park.We forgot that.Jack became worried about it.He walked around the room several times and then sat down in front of me and looked at me.But I still paid no attention （注意） to him.I went on talking with my friend.At last,Jack could not wait any longer.He went out of the room and came back a few minutes later.He sat down in front of me again.But this time,he held my hat in his mouth.Suddenly,I understood what Jack meant and so did my friend.
21.How many people are there in this story?______.
　　A.One B.Two C.Three D.Four
22.Jack______.
A .is a close friend of mine
B.enjoys long walks in the park every Sunday afternoon
　　C.has many close friends D.enjoys talks in the room
23.Jack was worried because______.
　　A.he wanted to eat something B.it was Sunday afternoon again
　　C.he was not feeling well
D.he wanted his master （主人） to take him for a walk
24.Jack took my hat in his mouth to show that ______.
　　A.I should leave the house at once
　　B.he liked my hat very much
　　C.he was hungry and he tried to eat it
　　D.he wanted to have a rest
25.Which of the following is true?______.
　　A.When Jack and I were talking,my friend didn't pay any attention to us
　　B.When I was talking to my friend,Jack didn't pay any attention to us
　　C.When my friend and I were talking,we didn't pay any attention to Jack
D.When my friend was talking to Jack,I paid attention to them