61._________A. waterB. airC. energyD. safety

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

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

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

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

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

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