问题 单项选择题

The IPCC announcement three years ago that "most of the warming observed over the last 50 years is" ______.

A.possibly due to human activities

B.possibly because human activities

C.due to likely human activities

D.human activities likely attributable

答案

参考答案:A

解析:[分析] 短语题型。 根据第二段第二句The IPCC announced in 2001 that “most of the warming ob served over the last 50 years is likely to be attributable to human activities”.中的 attributable to指“可归于……的”;C项的due to指“由于,应归于”;be cause是连词后面跟从句,因而应排除B。修饰due to的副词不应放在to的后面,因而排除C。D不符合表达习惯。

填空题
单项选择题