以下是引用sisy80在2006-12-19 13:07:00的发言:
弱问DS题,例如下面这道题,问X是奇数吗,如果条件(1)能推出X是偶数,那么(1)是充分的吗。 我的意思是说必须能推出X是奇数才可以吗。如果题目问,ask if x is an odd interger? 是不是主要推出唯一性,或奇或偶都可以。谢谢。
Is x an odd integer? (1) x + 3 is an odd integer. (2) x/3 is an odd integer. A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient. B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient. C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient. D. EACH statement ALONE is sufficient. E. Statements (1) and (2) TOGETHER are NOT sufficient.
按照DS题,只要能够推出关于问题的确定结论就算是sufficient 从1可以推出X是偶数,结论:X is not an odd integer,sufficient 从2可以推出X是奇数,结论:x is an odd integer, sufficient 所谓充分,就是单只这个条件就而已推出确定的结论^^ |