题干
阅读对话,选择正确的答案。
Sarah: Mum, where is my skirt?
Mum: Is it on your bed,
Sarah: No, it isn't．It's orange．It's your dress．
Mum: Is it red?
Sarah: Yes, it is．
Mum: Is it on the chair?
Sarah: Yes．Thanks．Mum．
Cu2O＋H2↑。下列说法正确的是（ ）