正在看og的diagnostic test部分,碰到一个DS的问题 Does the integer k have at least three different positive prime factors? (1) k/15 is an integer. (2) k/10 is an integer. The correct answer is C; both statements together are sufficient.
拿一道今天做错的CR大家讨论一下！ 34. Ayear ago, Dietz Foods launched a yearlong advertising campaign for its cannedtuna. Last year Dietz sold 12 million cans of tuna compared to the 10 million sold during the previous year, an increase directly attributable to new customers brought in bythe campaign. Profits from the additional sales, however, were substantially less than the cost of the advertising campaign. Clearly, therefore, the campaign did nothing to further Dietz's economic interests. Which of the following, if true, most seriously weakens the argument? (A) Sales of canned tuna account for a relatively small percentage of Dietz Foods' profits. (B) Most of the people who bought Dietz's canned tuna for the first time as a result of the campaign were already loyal customers of other Dietz products. (C) Aless expensive advertising campaign would have brought in significantly fewer new customers for Dietz's canned tuna than did the campaign Dietz Foods launched last year. (D) Dietz made money on sales of canned tuna last year. (E) In each of the past five years, there was a steep, industry-wide decline in sales of canned tuna.
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发表于 2012-12-14 12:00:35
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