1. 听材料，回答问题。

1. （1） What are the speakers talking about?

   A . Using the left hand. B . Operating machines. C . Designing machines.
3. （2） Who is the machine designed for?

   A . Right-handers. B . Left-handers. C . Newcomers.
5. （3） What can we learn from the conversation?

   A . Left-handers can't run the machines. B . The woman only uses her right hand. C . The woman is more skillful than the man.