阅读理解。
     Henry wants to borrow a book from the library. He comes to the library with his classmate. They
can't see any assistant in it, but only some robots are standing there. Henry says to the robot, "Hey, give
me a book on music." But the robot doesn't move. Then another student tells Henry, "You must say
'Excuse me' and 'Please' first when you want some help." Henry dose so and the robot brings the book.
But Henry can't get the book from the robot's hands, he thinks for a moment, then he says a word to the
robot. The robot gives him the book. Henry gets the book and goes home happily.
1. Why can they not see any assistant? Because ________.
A. the robot takes the places of (代替) the assistant
B. the library won't hire (雇用) any assistants
C. the library has to pay less for the work of the robots
D. there are no assistant to hire  
2. Why will the little robot not get the book for Henry at first? Because ________.
A. the little robot is too lazy  
B. the little robot is too tired
C. the little robot is too busy  
D. Henry talks with bad manners
3. What do you think Henry says to the robot at last?
A. Bye          
B. Thanks    
C. Hello          
D. Give
4. What kind of book does Henry like?
A. History.        
B. English.  
C. Music.        
D. Math
5. The main idea of the passage is ________
A. how to say to a robot  
B. how to borrow books
C. robots have feelings  
D. robots in the library