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（?宁夏）下列各组气体中均能用固体氢氧化钠干燥的一组是（ ）
A．H2、O2、HCl
B．H2、O2、CO
C．H2、SO2、CO
D．O2、CO、C02最新问答：
SO2、CO2是酸性氧化物，HCl是酸性气体，它们都能与碱生成盐和水，所以不能用氢氧化钠来干燥．
而H2、O2、CO是中性气体，能用碱来干燥．
故选B
点评：
本题考点： 空气中常见酸碱盐的质量或性质变化及贮存法；常见气体的检验与除杂方法．
考点点评： 在初中阶段的干燥剂有三类，一类是碱性干燥剂，一类是酸性干燥剂，一类是中性干燥剂．碱性干燥剂干燥的是碱性和中性气体，而酸性干燥剂干燥的是酸性和中性气体，中性干燥性能干燥所有的气体．
无选项英语完型填空（每空一个单词）
the first printed newsbook,published in 1513 and titled the trewe encounter,was an account of the battle of flodden field.the anglo-scottish wars of the 1540s＿＿printers with material for more newsbooks.during the 17th century,news sheets ＿＿ to the business centers of europe,＿＿news of commerce.as the historian bernard weisberger has pointed out,the newspaper”＿＿as a handmaiden of commerce by emphasizing news of trade and business.”
to this day,much of our news is about the＿＿of *** and business,and our journalism＿＿to stress drama of war and other calamities.
a major difference between these old news carriers and modern journalism is that the news＿＿－newspapers,magazines,television and radio stations－＿＿at such a diverse audience that many different kinds of news are presented in a ＿＿issue or newscast.editors look for a balanceed news reportto＿＿to a wide audience,for economic survival depends upon holding the mass audience.最新问答：
shifted
called
served
actions
continues
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adapt
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