血清学抗体滴度资料的平均数平均水平最常计算的是（）。

A.算术均数

B.中位数

C.几何均数

D.全距

E.众数

After staying in hospital for long，the patient was advised to go to the seaside to ________ his health．[ ]

A．take up  

B．pick up

C．carry up  

D．make up