31页35.Pollution is more and more serious than before .sure .Peple should ------------cutting treesA.prevent B.be prevented C.be kept 理由

31页35.Pollution is more and more serious than before .sure .Peple should ------------cutting trees A.prevent B.be prevented C.be kept 理由 31页35.Pollution is more and more serious than before .sure .Peple should ------------cutting treesA.prevent B.be prevented C.be kept 理由 Air pollution is more serious than water pollution.的意思? why air pollution is the most serious? N___ pollution is bad for our hearing. What's wore is that pollution has The pollution in Lijiang is very few. This noise pollution is very s___ it is （t ）the pollution is worse and worse There is a lot of pollution.(改为一般疑问句） ____ ____ ____ of pollution. the pollution of SO2 is now the most dangerous problem of air pollution Lt is true that a____ pollution is still the most s___ now,but it is only one kind of pollution. It is important to take indoor air pollution seriously. 用英文回答what is the cause of water pollution? pollution is (harm) to 中间用什么形式 Air pollution is now a serious problem in China 英译汉 More and more water is getting_____.pollute polluting polluted pollution The air is filled with pollution同义句