阅读理解(每小题2分，共30分)
A
My friend，Dick，has a large police dog．Its name is Jack．Every Saturday afternoon，Dick takes Jack for a long walk in the park．Jack likes these long walks very much．
One afternoon，a young man came to visit my friend．He stayed a long time．He talked and talked．Soon it was time for my friend to take Jack for a walk．But the man was still(仍然) there．Jack became very worried(着急的)．He walked around the room several times and then sat down in front of the man and looked at him．But the man kept talking．Finally Jack couldn’t stand it．He went out of the room and came back a few minutes later．He sat down again in front of the man，but this time he held the man’s hat in his mouth．
From the story，we know that Jack is ________．

A．Dick’s good friend

B．a large police dog

C．a young man

D．a young man’s dog

Where does Dick walk his dog every Saturday afternoon？

A．In his room．

B．In the street．

C．In the park．

D．In the field．

Jack became very worried one afternoon because ________．

A．Dick couldn’t take him out for a walk at the usual time

B．a young man came to visit Dick that afternoon

C．Dick walked around his room several times

D．he couldn’t find the young man’s hat

What does the underlined word“stand”mean in the passage？

A．站立

B．理解

C．支持

D．忍受

Why did Jack sit down again in front of the man with the hat in his mouth？

A．Try to make the man laugh．

B．Like the young man very much．

C．Ask the young man to leave．

D．Want to talk with the young man．