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【单选题】
As a promotional experiment, Omega Company distributed four million catalogs. In one of the two versions of the catalog, the description of each item for sale mentioned a 'Made by Hand' label. The number of purchases from consumers receiving that catalog was twenty percent greater than the number of purchases from consumers receiving a catalog that did not mention the label. Thus, the mention of the label stimulated sales. Which of the following, if true, could best be used to challenge the conclusion drawn above?A.
Consumers receiving the catalog mentioning the label had previously purchased items from Omega Company by mail but consumers receiving the other catalog had not.
B.
Surveys showed that consumers returned purchased items to Omega Company during the promotional campaign at the same rate regardless of which catalog they received.
C.
The number of purchases from Omega Company declined substantially after the promotional campaign was completed .
D.
Omega Company mailed three times as many catalogs that did not mention the 'Made by Hand' label as catalogs that did mention the label.
E.
Omega Company sold twenty percent fewer items during the year of the promotional campaign than it had during the previous year.
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举一反三
【单选题】x+y小于10且x-y大于0的逻辑表达式是________。
A.
x+y <10 Or x-y>0
B.
x+y <10 . And. x-y>0
C.
(x+y)<10 : (x-y)>0
D.
x+y < 10 And x-y>0
【简答题】使某人自己能被理解
【单选题】下列选项中,属于唱衰社会主义,鼓吹中国崩溃论的人和作品包括( )。
A.
尼克松《1999, 不战而胜》
B.
布热津斯基《大失败——二十世纪共产主义的兴亡》
C.
章家敦《中国即将崩溃》
D.
以上都是
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【简答题】已知数据文件IN72.DAT中存有200个4位数，并已调用读函数readDat()把这些数存入数组a中，请编制一函数jsVal()，其功能是：把个位数字和千位数字重新组合成一个新的十位数ab(新十位数的十位数字是原4位数的个位数字，新十位数的个位数字是原4位数的千位数字)，以及把百位数字和十位数字组成另一个新的十位数cd(新十位数的十位数字是原4位数的百位数字，新十位数的个位数字是原4位数的十位数...
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