61._________A. waterB. airC. energyD. safety

________ are used to protect your feet.A.HelmetsB.Safety gogglesC.Safety boots

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This passage mainly discusses ______ .A．the functions of carbon dioxide and waterB．the rol

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People around Florida stocked up on the following EXCEPT______.A．bottled waterB．various ve

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How much ______ is there in the tin？A、waterB、orangeC、cakesD、cake

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59._________A.. waterB. liquidC. methodsD.sources

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_________(53)A.high temperature B.hot airC.heat D

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61._________A.water B.air C.energy D.safety

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