维生素D缺乏性佝偻病激期，最主要的表现是
A．多汗B．骨骼改变C．血钙升高D．血磷升高E．夜惊
参考答案：B
下列反应中，不属于氧化还原反应的是[ ]
A．C + O2 CO2
B．CH4 + 2O2 CO2 + 2H2O
C．CaO + H2O == Ca(OH)2
D．CuO + H2 Cu + H2O
Do you think people will have robots ?[ ]
A. at their homes
B. in their home
C. in their homes
D. at homes
CO2 
CO2 + 2H2O 
Cu + H2O