Mrs．White has a son．His name is Sam．The young man begins to work in a post office in a big city this autumn．He asks his mother to visit the city．The old woman is happy and catches a train．Soon she gets to the city，but she doesn't know where the post office is．She begins to look for it．At a bus stop she asks an old man，"Excuse me，sir．How can I get to the post office，please？"

"We have about forty post offices in our city，" says the old man，"Which one do you want？"

The old woman gives Sam's address to him and the old man says， "Walk along this street and take the fourth turning on the left．His post office is just there．"

Mrs．White thanks the old man and soon finds her son．They're very happy．A week later the old woman goes to the zoo．She sees all kinds of animals．But after that she can't find the way again．At the same bus stop she meets the same old man and she asks the same question again．

"Oh dear！" the old man calls out．"Are you still looking for your son？"

（1）Where does Sam work？ 　　

A．	In a zoo．
B．	In a post office．
C．	At a train station．
D．	At an old people's home．

（2）How does Mrs．White get to her son's workplace from the bus stop？ 　　

A．	On foot．
B．	By train．
C．	By bus．
D．	By taxi．

（3）What does Sam give his mother before she arrives？ 　　

A．	A ticket．
B．	His address．
C．	His phone number．
D．	His key．

（4）Why is the old man so surprised to see Mrs．White again a week later？ 　　

A．	Because he knows her now．
B．	Because he is very happy to see her．
C．	Because he thinks she hasn't found her son yet．
D．	Because he thinks she has already been back home by train．

（5）What can you infer（推断） from the passage？ 　　

A．	Mrs．White knows the city well．
B．	Mrs．White doesn't find her son at last．
C．	Sam's post office isn't far from the bus stop．
D．	The old man always waits at the bus stop for someone to ask him the way．