---Do you often cook at home, Lucy?

---No, It is my husband _________ does most of the housework.

A．that

B．whom

C．what

D．which

不符合β-地中海贫血杂合子的是（）

A.β链合成减少

B.HbA减少

C.HbA2减少

D.HbF增高

E.以上都不是