十一届三中全会的核心内容是 [ ] A．高度评价真理标准问题的讨论 B．重新确立

国内某作家完成了一部小说，3月份第一次出版获得稿酬20000元，8月份该小说再版获得稿酬10000万元，该作家两次所获稿酬应缴纳个人所得税( )元。

A．3860

B．4800

C．3460

D．4660

使用资源管理器可以完成文件/文件夹的建立、（）、复制、删除。

A、使用

B、移动

C、开

D、串联

One might ask why speculation is permitted when there is so real a danger of loss. The basic reason is that speculation can perform useful functions in the market equilibrium and encourages faster entry of more suppliers. If the price change lagged until after an actual commodity shortage had occurred, the fluctuation would probably be sharper and more sudden. Remedial supply action could not be further delayed. Similarly, if speculators foresee a surplus in some commodity, their selling of futures will help drive the price down to some extent before the surplus actually occurs. When speculators foresee a shortage and bid up the price, they are also helping to conserve the present supply.

假定现在的年利率为10%，某投资者欲在3年内每年的年末收回10 000元，那么此时他需要存入银行( )元。(不考虑利息税)

A．40000

B．24 869

C．28 366

D．25 382

煮沸灭菌时，为了使沸点提高到105℃，应加入（）

A.碳酸氢钾

B.碳酸氢钠

C.碳酸钙

D.亚硝酸钠

E.乳酸钠