将表面已完全钝化的铝条，插入下列溶液中，不会发生反应的是( ) A．稀硝酸 B．稀盐酸 C．硝酸铜 D．氢氧化钠
（2010·福建福州屏东中学高三9月阶段性考试）The little boy insisted ___________to watch the opening ceremony of the Beijing 2008 Olympic Games. A. on taking B. to be tak
一走时准确的时钟（设它们的指针连续均匀转动） A．时针的周期是1h，分针的周期是60s B．分针的角速度是秒针的12倍 C．如果分针的长度是时针的1.5倍,
Where ____Paul and Steve _____from ? A. do , comes B. does, come C. do , come D. is, come
Look at that old woman ! She is looking around for help . She must be lost . A．socially B．accidentally C．desperately D．absolutely
配平化学方程式 KMnO4＋FeS＋H2SO4——MnSO4＋Fe2（SO4）3＋S↓＋K2SO4＋H2O
+
+
+…+
=29.