While we are still children ,most of us live at home with our parents, more or less peacefully . But as we become teenagers , things change ,and we begin to grow apart from our parents . This means we are almost ready to leave the house where we grew up and make a new home of our own .
All humans must do this ,but they don’t all do it in the same way . If ,for instance ,you belong to a primitive tribe (原始部落) ，then as you grew up ,you’d learn the skills you needed as an adult---how to catch fish ,how to keep the house and look after children . You would be ready to marry in your early teens and you would build a house and live near your family in the village.
This seems a very old way of life , but it is what humans have been used to through hundreds of years. And it is what we are still used to in the 21^st century ,for man hasn’t changed in the short time since he became civilized(文明的). But could you leave home and look after yourself during the teen years ? Most people would not do very well . Why ? Because although man hasn’t changed very much , the society he lives in has changed greatly ,which means that we have to learn more and more before we are ready to leave our parents’ shelter( 居所 ) and live alone .
However ,sometimes it is very frustrating to live at parents’ home . Parents can be very upset about late nights ,criticizing friends and always saying that we are noisy and dirty . But we still need our emotional (情感的) shelter till we finish our studies , and that is why we usually stay in our parents’ home until we feel grown up enough to deal with living alone .
When does the relationship with parents start changing ?

A．When we are children .

B．When we become teenagers .

C．When we are alone .

D．When we get married .

For most teenagers of the  21^st century ,making a new home of their own may be ________.

A．difficult	B．unimportant
C．impossible	D．quite easy

Why must we know more to be able to live alone ?

A．Because we are becoming less talented .

B．Because our society has changed a lot .

C．Because not enough is taught in our schools.

D．Because man has never really been civilized.

From the passage ,we know living at parents’ home when we become teenagers _______ .

A．is always pleasant

B．must be very exciting

C．makes us feel lonely

D．may be annoying