2. 考研
  3. It has been estimated that the earth’s surface temperature has increased ______ one quarter to three fourths of a degree since 1

It has been estimated that the earth’s surface temperature has increased ______ one quarter to three fourths of a degree since 1

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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项答案正确。全句意思为“据估计，从1850年以来，地表温度增加了0.25--0.75°F”。
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