2. 外语
  3. It has been estimated that the earth’s surface temperature has increased______one quarter to three quarters of a degree since 18

It has been estimated that the earth’s surface temperature has increased______one quarter to three quarters of a degree since 18

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问题 It has been estimated that the earth’s surface temperature has increased______one quarter to three quarters of a degree since 1805.
选项 A、to
B、by
C、at
D、with
答案B
解析 增加或降低／减少了多少用介词by，增加到或降低／减少到多少用介词to，考生一定要区分清楚。类似用法的词还有：decrease，fall，drop，reduce，rise等。题句意为：“据估计，自从1805年以来地球表面的温度已经增加了0．25度到0．75度。”
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