题型:选择题 Mr. Wang is a _____ man, he has a lot of money. He often helps the _____ .[ ]A. rich, rich B. poor, rich C. rich, poor D. poor, poor 查看答案
题型:选择题 (2分)(2012•巴中)下列化学方程式书写正确的是( )A.H2O2H2O+O2↑B.HCl+NaOH=NaCl+H2O C.2Al+O2="2AlO" D.2H2O=2H2+O2 查看答案