It has been estimated that the earth’s surface temperature has increased ______one quarter to three fourths 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 fourths of a degree since 1850.

选项 A、by
B、at
C、to
D、with

答案A

解析 应该掌握选择项中四个介词的不同用法,修饰数字的介词一般为“by”,所以A项正确。全句意思为“据估计,从1850年以来,地表温度增加了0.25到0.75度”。
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