2. 外语
  3. The author is primarily concentrated on ______.

The author is primarily concentrated on ______.

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问题 The author is primarily concentrated on ______.
选项 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
答案C
解析 subscribe to赞成，同意。句意：我从不赞成人比动物重要这种看法。hang on坚持下去，(打电话)不挂断；engage in从事于；indulge in沉溺于。
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