A-A+
The author is primarily concentrated on ______
问题详情
The author is primarily concentrated on ______.
A.explaining the effects that the burning of fossil fuels might have on climate
B.illustrating the effects of CO2 on atmospheric radiation
C.discussing effects that changes in the CO2 level in the atmosphere might have on climate.
D.challenging hypotheses about the effects of water vapor and CO2 on climate
参考答案
正确答案:C
解析:作者主要讨论大气中CO2含量对气候造成的影响。作者在第二段和第三段专门讨论这一问题。A不能选,因为作者只是轻描淡写地讨论这一问题。