The rise of green house gas emissions leads to______. A．the decrease of ppm statistics B．the faster increasing rate of ppm C．the slower increasing rate of ppm D．the highest readings in recorded history
A. A．the B.the C.the D.the
【参考答案】
B 原文第四段最后一句为：Therateofincreaseisnow2．1ppm--threetimesasf......