Everyone knows we must exercise regularly to maintain good health．Indeed, staying physically fit is a big part of our culture．We consider （and rightly so） that healthy people are attractive people．Since most of us want to be attractive, there is no shortage of exercise clubs, training videos, magazines, and books offering to help us stay physically fit．
Unfortunately, however, our culture does not place the same emphasis on mental fitness．Although we admire and love men and women with strong and healthy-looking bodies, we don’t have the same degree of respect or attraction for smart, educated and mentally healthy people．This is a shame, because there are immense rewards for people who have developed the ability to think well．
If your mind is well trained and flexible, you will be able to understand a great deal of what happens around you．And if you are also well educated--- that is, if you understand basic science, mathematics, music, art, literature, history and so on--- you will find it much easier to make good decisions throughout your life．Over the long run, this leads to a sense of control over your destiny and a much better life than otherwise．
People who are poorly educated or who don’t think well--- that is, people who are not mentally fit see things differently．Their world is controlled by mysterious, but often malevolent (恶意的) forces．Such people live within a system they will never master, forced to follow the rules they will never understand．Although it may not be obvious, most people spend their lives being manipulated (控制) by others．They are told what to do, what to think, how to spend their money, and what they should and should not aspire (渴求) to in life．
In my opinion, if you want to live well, you must be able to use your mind well．For this reason, I want you to be able to concentrate, solve problem, understand complex ideas, and think clearly and quickly．Such skills will make it easier for you to make informed decisions, understand current events, choose good friends, manage your money well, make wise long-term decisions, and appreciate music, art and literature．
The key to developing such skills is to enjoy learning, and to have the ability and motivation to teach yourself．
67．The writer of the passage feels disappointed that______________．
A．some people have not the skill to make good decisions
B．the world of the physically healthy people is controlled by mysterious forces
C．mentally healthy people are not as popular as physically people
D．too much has been done to help people stay physically fit
68．The underline word “this” refers to___________．
A．the understanding of a great deal of what goes on around you
B．the understanding of basic science and mathematics
C．good training in body and mind
D．being able to make good decisions in life
69．The writer of the passage thinks that those who are not mentally fit___________．
A．live a poor and mysterious life         B．can’t control over their life
C．often do what others do          D．enjoy being fooled and ruled
70．The best title of the passage will most probably be______________．
A．Mind Helps You More                B．Train Your Mind
C．Make Informed Decisions             D．Learn More to Help Yourself