分类：教育/科学-外语学习
问题：6B1.Thereareriversand___(saterms 
1.There are rivers and ___(saterms).2.The picture is very ___(fleuaub).3.We must stop ___(poutllign) the air.4.___(stoanrtasu)took this photograph from space5.People must stop cutting down the ____(rfoests) 
回答： reams.溪流
 autiful.美丽的
3.polluting.污染
 tronauts.宇航员
 rests.森林