Until the current warming trend exceeds the range of normal clima

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Until the current warming trend exceeds the range of normal climatic fluctuations, there will be, among scientists, considerable_____the possibility that increasing levels of atmospheric CO2 can cause long-term warming effects.

A、interest in
B、uncertainty about
C、enthusiasm for
D、worry about
E、experimentation on

答案：B

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不太明白为什么选B

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