填空题

From 1948 to 1961, the proportion of American blacks earning less than $ 3000 a year declined from 78 to 47 percent; at the same time, blacks earning more than $10.000 increased ______ from less than 1 to 17 percent. (Proportion)

【参考答案】

proportionally

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填空题

In Yugoslavia, the late 1960s and early 1970s were marked by improved relations with other countries, regardless of their political ______. (orient)

问答题

The only solid pieces of scientific truth about which I feel totally confident is that we are profoundly ignorant about nature. Indeed, I 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 to be told by any of us how little we know and how bewildering seems the way ahead. 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 understand how things worked or ignored the problem, or simply made up stories to fill the gaps. Now that we have begun exploring in earnest, we are getting glimpses of how huge the questions are, and how far from being answered. It is not so bad being ignorant if you are totally ignorant; the hard thing is knowing in some detail the reality of ignorance, the worst spots and here and there the not-so-had spots.

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