在一国金融体系中，居于主体地位的是( )。
A．中央银行
B．商业银行
C．政策性银行
D．非银行金融机构
参考答案：B
解析：[知识点] 金融概述
Once a reporter receives his assignment from the chief-editor, he has to ______ on his work and tries his best to work on it until the chief-editor ______ it. [ ]
A. fix his attention; approves
B. focus; proves of
C. concentrate; approves of
D. get down; approves
5岁儿童的头围约是
A．36cmB．40cmC．46cmD．50cmE．56cm
