题干
—What is that?
—________.
A：It's great
B：How nice
C：It's a CD
答案(点此获取答案解析）
C
—________.
A：It's great
B：How nice
C：It's a CD
a kJ/mol、P—O b kJ/mol、P==="O" c kJ/mol、O==="O" d kJ/mol。
