Scientists are alarmed that CO2 levels keep rising because the climate was much warmer then.

分类: 作业答案 • 2022-01-09 18:04:51

问题描述：

Scientists are alarmed that CO2 levels keep rising because the climate was much warmer then.
上句后半部分意思到底是现在暖和还是以前?如果是以前,哪co2怎么会持续上升呢?

答

现在暖和,CO2浓度上升的话造成温室效应但是后半句用的是过去式，而且有THEN，那不是指过去吗？