It can be inferred(推断出)that the main idea of this passage is ______.

A．Since human beings cannot live alone, being neighbor will be important again.
B．Machines are not good because they keep people apart.
C．Neighbors are not necessary in our time of machines.
D．Machines call replace good neighbors as they can work for people and entertain people.

A．When the power failure hit New York City, people only minded their own business.
B．Nobody needs all the machines we have made till now.
C．People used to pay each other with their building, raising, and so on.
D．People have difficulties in finding a good neighbor today.