[单项选择]

It is hard to predict how science is going to turn out, and if it is really good science it is impossible to predict. If the things to be found are actually new, they are by definition un known in advance. You either have science or you don’t, and if you have it you are obliged to accept the surprising and disturbing pieces of information, along with the neat and promptly used bits.
The only solid piece of scientific truth about which I feel totally confident is that we are profoundly ignorant about nature, l regard this as the major discovery of the past hundred years of biology. It would have amazed the brightest minds of the 18th century Enlightenment(启运动) to be told by any of us how little we know and how bewildering the way ahead seems. It is this sudden confrontation with the depth and scope of ignorance that represents the most significant contribution of the 20th century science to the human intellect. In earlier times, we either pretended to understa
A. man can find solutions sooner or later to whatever questions concerning nature he can think up
B. man cannot solve all the problems he can think up because of the limits of human intellect
C. sooner or later man can think up all the questions concerning nature and answer them
D. questions concerning consciousness are outside the scope of scientific research