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【单选题】
81 下列关于SO2的叙述,正确的是( )。A.
SO2是硫酸的酸酐
B.
大气中SO2的主要来源是汽车排出的尾气
C.
SO2能漂白某些物质，说明它具有氧化性
D.
SO2既可以是含硫物质的氧化产物，又可以是含硫物质的还原产物
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举一反三
【简答题】All agriculture in Egypt is watered by ______.
【简答题】A．Reading B．Sheffield C．Manchester D．Egypt
【单选题】根据短文回答 41～45 题。 Ancient Egypt Brought Down by Famine Even ancient Egypt's mighty pyramid (金字塔) builders were powerless in the face of the famine (饥荒) that helped bring down their civilization around 2...
A.
Because they once worked miracles
B.
Because they were well-built
C.
Because they were actually very weak
D.
Because even they were unable to rescue their civilization