题干
— What's this?
— a quilt.
A：This's
B：This is
C：It's
D：Its
答案(点此获取答案解析）
C
— What's this?
— a quilt.
A：This's
B：This is
C：It's
D：Its
2C(g)+2D(g),在不同条件下的反应速率如下，其中反应速率最快的是 （ ）
