中央银行的资产业务主要有（）。
A.再贴现业务
B.再贷款业务
C.对政府贷款业务
D.黄金与外汇储备
E.经理国库业务
参考答案：A, B, C, E
Using his hybrid rice, farmers are producing harvests before.[ ]
A. as twice large as
B. twice large than
C. larger than twice
D. twice as large as
税收的固定性既包括时间上的连续性，又包括征收比例的固定性。( )
