Science is a process that builds upon existing theories and knowledge by continuously revising them. Every aspect of scientific knowledge can be questioned, including the general rules of thinking that appear to be most certain. So why is science trustworthy if it is always changing? If tomorrow we will no longer see the world as Newton or Einstein found it to be, why should we take seriously today’s scientific description of the world?

The answer is simple: Because at any given moment of our history, this description of the world is the best we have. The fact that it can be made better can’t diminish (降低) the fact that it is a useful instrument for understanding the world.

Consider a folk healer’s herbal medicine. Can we say this treatment is “scientific”? ...

What can we learn about today’s scientific description of the world?

A．It can be timeless.	B．It can be improved.
C．It is of little value.	D．It is the best at any moment.