Man has been storing up useful knowledge about himself and the universe at the rate which has been spiraling upward for 10000 years.
1 j4 }' d' n7 f( a& C5 _ g) Q The __1_ took a sharp upward leap with the invention of writing,but even __2_ it remained painfully slow for several centuries.The next great leap forward __3_ knowledge acquisition did not occur __4_ the invention of movable type in the 15th century by Gutenberg and others.__5_ to 1500,by the most optimistic __6_,Europ was producing books at a rate of 1000 titles per year.This means that it __7_ a full century to produce a library of 100000 titles.By 1950,four and a half __8_later,the rate had accelerated so sharply that Europe was producing 120000 ttitles a year._9_ once took a century now took only ten months.By 1960,a __10_ decade later,the rate had made another significant jump,__11_ a century's work could be finished in seven and a half months.__12_,by the mid-sixties,the output of books on a world__13_,Europe included,approached the prodigious figure of 900 titles per day.! ^5 l. r: F/ W. N
One can __14_ argue that every book is a net gain for the advancement of knowledge.Nevertheless we find that the accelerative __15_ in book publication does,in fact,crudely __16_ the rate at which man discovered new knowledge.For example,prior to Gutenberg __17_ 11 chemical elements were known.Antimony the 12th,was discovered __18_ the time he was working on his invention.It was fully 200 years since the 11th,arsenic,had been discovered.__19_ the same rate of discovery contioned,we could by now have added only two or three additional elements to the periodic table since Gutenberg.__20_,in the 450 years after the time,certain people discovered some seventy additional elements.And since 1900 we have been isolating the remaining elements not a rate of one every two centuries,but of one every three years.8 m3 f7 Q9 q/ `8 _9 @% K
1) A accumulation B development C knowledge D rate0 j5 }6 m+ H9 s) g. H2 C- ~2 S* e
2) A so B if C then D when J- ~: y# ?4 }( D [/ C$ ]
3) A to B by C from D in
% h' J- p9 g) Q7 W/ |/ i 4) A until B since C when D before3 _( Z; B$ z4 Z U& t
5) A as B due C prior D next
8 O$ p! q5 A) o' L8 o 6) A examples B estimates C evidence D evaluation) Y5 d- O( U( @
7) A would take B had taken C was taking D would have taken
# f+ s! Q* ^# ]3 ]& ?4 T 8) A decades B centuries C dozens D years, }1 f8 ]6 f) a+ ?- M/ S/ k6 g
9) A this B these C it D what+ F- q: s+ C+ s7 \9 K# j. t
10) A plain B historic C single D eventful
/ D, n/ ]0 L& b& e9 n+ i% w 11) A now that B so that C as D when
% A) N4 w+ N% L( [% d3 o6 o5 J 12) A however B but C and D therefore. w: X$ f) Z3 P4 J1 H
13) A scope B sphere C scale D stretch" e8 }1 Z7 n- ]7 ~: m+ v" T
14) A therefore B hardly C accordingly D therefore
- _+ B6 d' O; N8 x9 [ 15) A line B circle C diagram D curve
" E2 ]6 F. M# h4 U, e* z% x9 X" ` 16) A fit B like C resemble D parallel
# `5 P: x3 f& |# X$ {) S' \ 17) A about B only C more than D less than; E) Y D- ?* q
18) A in B at C on D for
/ X' n- F9 V! P 19) A as B had C if D with) W& @" w4 S# z! x. ~" C
20) A in addition B in turn C instead D in particular# m9 U3 L- q- S3 b$ h9 L: K/ ?. \1 w# d
答案:DAAAC BABDC BCCBD DBBBC |