This, they say, is proof that the more primitive species was not simply supplanted by an advanced one ______ into one.

A．We live in relatively affluent society.
B．The environment is not as harsh and rough as it was for our ancestors.
C．Our depression is mainly caused by the action of other people not the environment.
D．We seldom suffer from depression and frustration nowadays.

A．women are not accepted in the department.
B．women are not as strong as men.
C．Yoshida will find herself in a difficult position if she becomes department head.
D．except them no one will trust her and believe her.