题目

  下列化学方程式书写正确的是 A．C+O2═ CO2                               B．C+O2         CO2↑加热  C．C+O2       CO2                   D．2C+O2 ═ 2CO2 答案：C（题文）I can sing the song, but he ______________.A. doesn’t B. does C. can D. can’t