下列选项中物质的名称、俗名、化学式一致的是（ ）
A．氢氧化钙----熟石灰---Ca（OH）2
B．二氧化碳---冰---CO2
C．氧化钙---大理石---CaO
D．氧气--臭氧---O3
A、氢氧化钙俗名为：熟石灰；化学式为：Ca（OH）2；完全一致，故A符合题意；
B、二氧化碳俗名为：干冰；化学式为：CO2；俗称错误，故B不符合题意；
C、氧化钙俗名为：生石灰；化学式为：CaO；俗称错误，故C不符合题意；
D、臭氧的化学式为O3，氧气的化学式为O2，，故D不符合题意．
故选A．
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