---Are you worried about the coming exam?

---No, I think the more _________you are, _________mistakes you’ll make.

A．careful; the less

B．carefully; the fewer

C．carefully; the least

D．careful; the fewer

用吸附柱色谱分离游离羟基葸醌衍生物，一般不用的吸附剂是（）

A．氧化铝

B．硅胶

C．聚酰胺

D．磷酸氢钙

E．活性炭