构成因子的两个亚基是（）
A.α和γ
B.α和β
C.α和δ
D.γ和δ
E.ε和β
参考答案：B
．--- I’m sorry. I should not have been so rude to you.
--- You____-- something not very nice to me, but that’s OK.
A．have said
B．had said
C．were saying
D．did say
一般温度在（）以上，酶的破坏才显著增强。
