What's the author's attitude towards long-promised home robot

A．they can do some domestic jobs in hospital
B．they can cook and package food
C．they can greet people at the' counter
D．they can do jobs human needs to solve a shortage of labourers

A．To assemble machines.
B．To do some kinds of cleaning.
C．To work as service men.
D．To tell that the corner where walls and ceilings meet goes in, not out.