A．Most of us should take more exercise.
B．It's better to live in the town.
C．The brain contracts if it is not used.
D．The more one uses his brain, the sooner he becomes old.

A.Most
B.
B．It's
C.
C．The
D.
D．The

【参考答案】

C
解析：What is the most possible conclusion of the passage?