文档介绍：(A)
It is hard to predict how science is going to turn out, and if it is really good science it is impossible to predict. ：：：：：：：：：：：：：：・：：：：：：：：：
::::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 useful bits.
The only solid piece of scientific truth about which I feel totally confident is that we are profoundly ignorant about nature. ：・：：：：：：：・ ：：：：：：：：：：：：：：：：：：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 -bad spots, but no true light at the end of the tunnel nor even any tunnels that can yet be trusted.
There are probably no question
we can think up that can be answered, # sooner or later .：.： .： .： 11 ： I
：：：：：：：：：：：：：：：：：：：： Within our limits we should be able to work our way through to all our answers, if we keep at it long enough , and pay attention.
What is the author 5s attitude towards science?
He is depressed due to the ignorance to the science
He is doubtful due to the difficulty in the scientific study
He is confident though he is aware of enormous difficulties in scientific research
He is puzzled that science can not be predicted
B)
Sugar is so much a part of our modern life that we only really think about it when, for some reason, we
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can not obtain it ::::::::::::Until quite recently it was considered as a medicine and as a luxury for the very rich only.
Sugar is, then, very important to our civilization. But what exactly it is?
：：：：：：：：：：：：：：：：：：：：：：：：：：：： But there are in fact many types of sugar, and the chemist recognizes hundreds of different varieties, coming from a different source.
About 90% of the sugar produced as food. Only 10% is used in industry for purposes other than food production. ：：：：：：：：：：：：：：：：：：：： ：：：：：：：： In the future these pote