Besides reducing human labor, robots can also ______.

A．Check your number and call again.
B．Ask the operator to put you through.
C．Ask the operator what has happened.
D．Tell the operator what has happened.

A．Differences between people will gradually disappear.
B．Differences between people will not exist as one hopes.
C．Differences between people will always continue to exist and the world will be a dull place.
D．Differences between people do exist even though different nationalities behave exactly alike.