题干
“— Is this your notebook?
—Yes, it is.”
朗读这组问答句的正确声调是_______.
A：— Is this your↘notebook? —↘Yes, ↗it is.
B：— Is this your↘notebook? — ↗Yes, ↘it is.
C：— Is this your↗notebook? —↘Yes, ↘it is.
D：— Is this your↗notebook? — ↗Yes, ↘it is.
答案(点此获取答案解析）
C
2Cu+CO2↑中，氧化剂是（ ）