题目选项分析

After analyzing data gathered by weather satellites, scientists report that the Earth's northern latitudes have become about ten percent greener since 1980, due to more vigorous plant growth associated with warmer temperatures and higher levels of atmospheric carbon dioxide.

After analysis of data, gathered by weather satellites, scientists report the Earth's northern latitudes as having become about ten percent greener since 1980, due to more vigorous plant growth associated with warmer temperatures and higher levels of atmospheric carbon dioxide.