The boy insisted that he           old enough, and          the right to make his own choice.

A．was; be given

B．was; was given

C．be; give

D．is; given

噬菌体在医学和生物学中有重要意义，其主要应用有( )

A．噬菌体分离与测定
B．检测标本中的未知细菌
C．细菌的鉴定与分型
D．分子生物学的重要实验工具
E．以上均包括