Every student in our class had an application form in his hand，but no one knew which office ________.

A．to send it to

B．to send it

C．to be sent to

D．to have it sent

能反映机体内维生素C贮存水平的是（）。

A.血浆维生素C浓度

B.白细胞维生素C浓度

C.脱氧尿嘧啶抑制试验

D.空腹尿中维生素C和肌酐含量测定

E.尿负荷试验