Life-long learning is the concept that “It’s never too soon or too late for learning.” — a philosophy that has taken root in a larger number of different organizations. Life-long learning is an attitude — learners believe that one can and should be open to new ideas, decisions, skills or behaviors. Life-long learning throws the well-known rule “You can’t teach an old dog new tricks” out of the door. Life-long learning provides the general public with learning opportunities at all ages and in different ways: at work, at home and through leisure activities, not just through formal channels such as school and higher education.
Life-long education is often achieved through distance learning or e-learning, continuing education, home schooling, etc. It also includes training programs for those who want to improve their qualifications, bring their skills up to date or retrain for a new line of work. In later life, especially in retirement, continued learning takes various forms, crossing traditional academic limits.
One of the reasons why life-long education has become so important is the rapid progress of modern science and technology. Although the period of primary, secondary and university education is increased, the knowledge and skills gained there are usually not sufficient for a professional career spanning(跨越) three or four decades.
The philosophy of life-long learning goes against the concept that “ ______”.

A．It’s never too late to learn.

B．Whoever cares to learn will always find a teacher.

C．A little knowledge is a dangerous thing.

D．You can’t teach an old dog new tricks.

What is the main idea behind life-long education?

A．To force people to keep in learning new skills throughout their working life.

B．To provide teachers with extra income.

C．To allow people to have chances to receive education throughout their life.

D．To prevent students from learning at school.

The underlined word “sufficient” in the last paragraph can be replaced by “______”.

A．popular	B．well-educated
C．well-informed	D．enough

It can be inferred that ______.

A．life-long education is the requirement of fast development of education

B．the increased period of school education is a supplement（补充） to life-long learning

C．the education system is failing to keep pace with rapid technology development

D．life-long education is intended for retired workers at home