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