How beautifully she sings! I've never heard _____. [ ]

A. the better voice

B. a good voice

C. the best voice

D. a better voice

查询全体主管的姓名（m_name）、出生年份（birth）和所在部门（dept），要求用 小写字母表示所有部门名，数据表名为 manager 实现该功能的语句为______。

A．select "m_name", 出生年份：,birth,islower(dept) from manager

B．select m_name,"出生年份：", birth,islower(dept) from manager

C．select m_name,"出生年份：", birth, dept from manager

D．select m_name,"出生年份：", birth,upper(dept) from manager