问题
单项选择题
下式中是酸性蓄电池充电方程的是（）。
A、2PbSO4+2H2O，PbO2+Pb+2H2SO4
B、2PbSO4+2H2O，PhO2+Pb+2H2SO4
C、PhSO4+H2，Pb+H2SO4
D、PbSO4+H2，Pb+H2SO4
答案
参考答案：A
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下式中是酸性蓄电池充电方程的是（）。
A、2PbSO4+2H2O，PbO2+Pb+2H2SO4
B、2PbSO4+2H2O，PhO2+Pb+2H2SO4
C、PhSO4+H2，Pb+H2SO4
D、PbSO4+H2，Pb+H2SO4
参考答案：A
Mr. Smith lived in a village. He had ___36__ farms and about twenty people working for him. He often told them _37_ hard and be honest. (诚实的). One day he went to a farm and worked with the workers there. Soon it was time __38___ lunch. He put ___39___ nice bread on the table and ___40___. A few minutes later he came back again but he ___41____ find the bread. ‘Who ate ___42__ on the table?’ he shouted. Some of the workers answered, ‘We ___43___.’ The others said, ‘We saw nothing.’ ‘Well,’ said Mr. Smith, ‘__44___ are a lot of mice in the rooms, you know. So I ___45___ some poison in the bread. ___46___ they eat, they must die. Then I can kill them.’ As soon as he finished, four workers began to cry. ‘Oh, dear!’ ‘___47___?’ asked Mr. Smith. ‘We ate the bread when you were out. We are going to die.’ One of them cried. ‘___48___,’ Mr. Smith said _49___ a smile, ‘I only ____50_____ you. Use your head.’
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