______no air or water, there would be no life in the world.

A． There was

B． There were

C． Is there

D． Were there

[试题].Waterandairare_______tohumanbeings.Wecannotlivewithoutthem.A.harbourB.functionC.definiteD.essential

[单选题]A．n energy tax would curb ordinary air pollution, limit oil imports and cut the budget _____.[A] disposition[B] deficit[C] defect[D] discrepancy

[问答题]Air pollution is more serious than water pollution.

[问答题]Air pollution is more serious than water pollution.

[单选题])8． ‘Would you like to drink some water?A． Yes，l' d love to．B． No，l' d love to．C． Don’t ask me．D． Sorry，l can't．

[问答题]What would you like to drink, mineral water or tea?

[问答题]What would you like to drink, mineral water or tea?

[单选题]_____ the 2008 Olympic Games, the air quality in Beijing would not be so go

[单选题]If tap water were as dangerous as some people think，_________would be getti

[单选题]Compressed air is supplied by air compression to （）.A . the air receiversB . the starting valvesC . the cylinder coversD . the distributor