问题 选择题

若{an}是等差数列,首项a1>0,a2011+a2012>0,a2011×a2012<0则使前n项和Sn>0成立的最大自然数n是(  )

A.4021

B.4022

C.4023

D.4024

答案

设等差数列的公差为d,

∵a2011×a2012<0,

∴(a1+2010d)(a1+2011d)<0

若d>0,∵首项a1>0,∴(a1+2010d)(a1+2011d)>0,不满足

∴d<0,即a2011>a2012

∴a2011>0,a2012<0

∵a2011+a2012>0,

∴a1+a4022=a2011+a2012>0

∴S4022=2011•(a1+a4022)>0

∵a1+a4023=2•a2012<0

∴S4023=4021•a2012<0

∴Sn>0时,n最大值为4022

故选B.

阅读理解

It was starting to get dark and Bobby turned to walk home when suddenly his eyes caught the setting sun’s rays reflecting off something along the roadside. He reached down and discovered a shiny dime(一角钱). Never before has anyone felt so wealthy as Bobby felt at that moment.

As he held his new found treasure, a warmth spread throughout his entire body and he walked into the first store he saw.

His excitement quickly turned cold when the salesperson told him that he couldn’t buy anything with only a dime.

He saw a flower shop and went inside to wait in line. When the shop owner asked if he could help him, Bobby presented the dime and asked if he could buy one flower for his mother’s Christmas gift. The shop owner looked at Bobby and his ten cents offering. Then he said to him, “You just wait here and I’ll see what I can do for you.”

The sound of the door closed as the last customer left. All alone in the shop, Bobby began to feel cold and afraid. Suddenly the shop owner came out. There, before Bobby’s eyes, lay twelve long stem, red roses, with leaves of green and tiny white flowers all tied together with a big silver bow. Bobby’s heart sank as the owner picked them up and placed them gently into a long white box. “That will be ten cents, young man.” The shop owner said reaching out his hand for the dime.

Sensing the boy’s reluctance(勉强), the shop owner added, “I just happened to have some roses on sale for ten cents a dozen. Would you like them?”

When the man placed the long box into his hands, he knew it was true. Walking out of the door that the owner was holding, Bobby heard the shopkeeper say, “Merry Christmas, son.”

小题1:Bobby feel that he was rich?

A.Because he found a purse with many dollars

B.Because he found some money on the way home.

C.Because he was given a bunch of flowers

D.Because he found some hidden treasure.小题2:What can we infer from the third paragraph?

A.Christmas gifts were always very expensive

B.The salesperson’s words greatly disappointed Bobby.

C.Bobby was tired of trying one shop after another

D.The salesperson was trying to cheat Bobby.小题3:While waiting for the shop owner in the flower ship, Bobby           .

A.was full of excitement and joy

B.was very thankful to the shop owner

C.felt he had been cheated by the owner

D.was not sure whether the owner would accept his offering

问答题

某企业2010年5月份经济业务如下:

(1)6日,将当日多余的现金60 000元存入银行。

(2)8日,购Z设备一台,价值500 000元,签发给对方五个月期限的商业汇票一张。

(3)10日,购入原材料一批,价款20 000元(不含税价),增值税税率为17%,材料已验收入库,并以银行存款支付了货款。

(4)13日,以银行存款支付职工保险费1 700元。

(5)25日,企业销售商品,商品销售价款260 000元(不含税价),增值税税率为17%,其中之前预收对方50 000元,其余款项未收到,但已确认记入收入,编制确认收入的分录。

(6)31日,根据考勤记录和产量记录计算本月应付的职工工资,其中生产工人工资为19 000元,车间一般人员工资为3 500元,厂部行政管理部门人员工资为5 000元。

(7)31日,计算本月应交所得税4 800元。

要求:根据业务(1)至(7)顺序填列下面的记账凭证。(本题共计16分)

(1)请根据业务(1)填制如下的记账凭证。

会计主管:×记账:×出纳:×审核: ×制单:×

(2)请根据业务(2)填制如下的记账凭证。

会计主管:×记账:×出纳:×审核: ×制单:×

(3)请根据业务(3)填制如下的记账凭证。

会计主管:×记账:×出纳:×审核: ×制单:×

(4)请根据业务(4)填制如下的记账凭证。

会计主管:×记账:×出纳:×审核: ×制单:×

(5)请根据业务(5)填制如下的记账凭证。

会计主管:×记账:×出纳:×审核: ×制单:×

(6)请根据业务(6)填制如下的记账凭证。

会计主管:×记账:×出纳:×审核: ×制单:×

(7)请根据业务(7)填制如下的记账凭证。

会计主管:×记账:×出纳:×审核: ×制单:×