- 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)
- reams.溪流
autiful.美丽的
3.polluting.污染
tronauts.宇航员
rests.森林