从猿到人的转变过程中，下列哪项起到了最重要的作用[ ]
A、直立行走
B、劳动
C、语言的产生
D、手的形成
答案：B
Having concentrated for a long time he ____ his work, made some coffee and talked with his colleagues.
A．put on
B．put aside
C．put off
D．put back
下列错误中，能通过试算平衡查找的有( )。
A．某项经济业务未入账
B．某项经济业务重复记账
C．应借应贷账户中借贷方向颠倒
D．应借应贷账户中借贷金额不相等
