如果正数x、y同时扩大10倍,那么下列分式中值缩小10倍的是( )
A:x−1y−1
B:x+1y+1
C:x2y3
D:xx+y
A:Hi, Li Ming.
B:Hi, Mrs Li.
A:What are you doing?
B:I'm reading a story book. What are you doing?
A:I'm writing a letter. May I look at your story book?
B:Certainly. Here you are.
A:Thank you.