_________(56)A.gas B.liquidC.solid D.air

On opposite ends of a single shaft of a turboblower are a gas driven _____ and a air compr

The Old New England villages have changed relatively little______a gas station or two in r

The _____ compressor and its electrical motor are entirely housed in a gas-tight casing.A.

Researchers discovered that plants______with a virus give off a gas that activates disease

When filled with a gas______ lighter than air, a balloon becomes buoyant and rises.A．muchB

_________(57)A.things B.chemicals C.water D.air