After winning the first prize, the boy ______ himself ______ pleasure.[ ]

A. abandoned, in  

B. was abandoned, to

C. abandoned, to  

D. abandoned, on

在提取原生苷时，首先要设法破坏或抑制酶的活性，为保持原生苷的完整性，常用的提取溶剂是

A．乙醇

B．酸性乙醇

C．水

D．酸水

E．碱水