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°”。

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GCT工程硕士（英语）

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