They did considerable work to ______ the masses of the United States with the elementary problems of Latin America.

A．allow

B．acquaint

C．notify

D．propagate

储蓄国债(电子式)具有( )特点。

A．针对个人投资者，不向机构投资者发行

B．采用实名制，不可流通转让

C．采用电子方式记录债权

D．免缴利息税