how important air is to human being用what 还是how

how important air is to human being用what 还是how How important It is to limit air and water pollution 句子有错吗 ___ important air is to living things! a.what b.what an c.what a d.how how important it is 还是how important is it how important happiness is!翻译 It is important to take indoor air pollution seriously. 英语二选一选择题.Air and water ( ) important.【is；are】 How important it is _____ (save) water! how important is english in our 为什么答案是how important it is? 空气真清新啊!How fresh the air is!what fresh air it is! meeting it is!A.What a important B.What important C.How an important D.What an important Rice,air and water ( )all important for us is or are Water and air ( ) important.A.has B.is C.have D.are _____ important air is to living things!A.howB.what anC.what a D.what Clean air is important to good health.请问to good health是什么成分? But air is important in many other ways-ways that are not always widely know意思 Air is so important for us.We can not live________(with)it.