In western culture,21 was the age________ young people traditionally received a key to their parents’ door, as a symbol of entering adulthood.

A．in which

B．on which

C．at which

D．to which

中国人民银行决定从2011年起，上调金融机构一年期人民币存贷款基准利率各1.08个百分点，其他期限档次存贷款基准利率作相应调整。这表明中国人民银行（）

A.是以赢利为目标的金融企业

B.是我国的中央银行

C.在银行业中居于主体地位

D.是政府实施金融调控的机构