根据人类体质方面的特征，地球上人类可以分 种、 种和黑种三个主要人种。
白；黄
As a new diplomat, he often thinks of _________ he can react more appropriately on such occasions.
A．what
B．which
C．that
D．how
现金日记账、银行存款日记帐、转账日记账属于序时帐。（ ）
