How much were the CO2 levels before the Industrial Revolution?A.400 parts per million B.280 parts per million C.120 parts per million D.680 parts per million 请帮忙给出正确答案和分析,谢谢!
How many fans were injured according to the news item?A.More than a thousand B.More than two thousand C.Less than a thousand D.Less than two thousand 请帮忙给出正确答案和分析,谢谢!