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问题 选择题

下列各组离子能在指定溶液中大量共存的是   [ ]

①无色溶液中：K+、Cl－、H2PO4－、PO43－、SO42－

②使pH=14的溶液中：CO32－、Na+、S2－、AlO2－

③室温下水电离的c(H+)＝10－13mol/L的溶液：K+、HCO3－、Br－、Ba2+

④加入Mg能放出H2的溶液中：NH4+、Cl－、Na+、SO42－

⑤使甲基橙变红的溶液中：MnO4－、NO3－、Na+、Fe3+

⑥室温下c(H+)/c(OH－)＝1012的溶液中：Fe2+、Al3+、NO3－、I－

A．①③⑥　　　　

B．①②⑤　

C．②④⑤　　

D．①③④

答案

答案：C

完形填空

During the Second World War．John's family didn't have a washing machine．Therefore，小题1:_____ （keep）clothes clean became a problem for them.

Before long，a family friend decided 小题2:______（join）the army and his wife was going with  him．John's family told them that they could take care of their furniture while they were away. To the family’s surprise，the friend suggested they should use his Bendix washing machine．“It would be better for it to 小题3:______（use），rather than sitting quietly，”he said．

Young John helped with the washing，and he developed a deep love of the old，green Bendix．

later，the war ended and the family's friend returned．When he came小题4:_____(take) the machine away．John became very sad．His mother saw this and said to him．“Son， you must remember that machine小题5:____(not belong) to us in the first place. It was a gift for us小题6:_____(be) able to use it for such a long time．So，instead of 小题7:_____ （be）sad about the loss．Let’s be grateful that we 小题8:_____ （be）able to use it at that time.”

We have all experienced loss：loss of people and things．However，if we see the thing we小题9:______（lose）as a gift that we were given for a time，maybe the sad memories 小题10:_____( change) into thankful ones．
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单项选择题

联合国教科文组织在《学会生存》中主张建设学习化社会，其建设学习化社会的关键在于（）。

A.推行回归教育

B.改革正规教育

C.实施终身教育

D.发展成人教育
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