电镀时，阳极的作用仅仅是导电，所以对阴极镀层的质量没有影响。

Man: The front tire is flat, and the seat needs to be raised.
Woman: Why not take it to Mr. Smith
Question: What kind of work does Mr. Smith probably do

A．He fixes bicycles.

B．He raises sleep.

C．He sells chairs.

D．He's a gardener.