We"ve all read global-warming scare stores. Though some scientists insist there is cause for alarm, evidence 21 otherwise. Global warming may be coming, but if it does, it won"t necessarily be 22 And it might actually be a boon (恩惠) for the environment.
When Senator Mitchell 23 his doomsday (世界末日) idea, crude computer climate models were predicting two or three times as much warming as they 24 do. Now researchers say that the earth is likely to warm by about three degrees Fahrenheit (华氏) during the next century.
That may sound like a lot, but it isn"t. The world has experienced 25 that much warming fairly recently in history. And we loved it! Between A.D. 900 and 1300, the earth warmed by some three 26 , according to the Oregon Institute of Science and Medicine. Scholars refer to that period—one of the most 27 in human history—as the Medieval Climate Optimum (适宜的).
Food production surged (猛增), many scientists believe, because winters were 28 and growing seasons longer. Key agricultural 29 experienced fewer floods and droughts. Death rates 30 in many places, partly because of the decrease in hunger.
A. currently I. presented
B. approximately J. indicates
C. inclined K. extreme
D. favorable L. suggest
E. declined M. numbers
F. degrees N. milder
G. regions O. constructive
H. frequently