lsat题，求解答

来源：百度知道 编辑：UC知道 时间：2024/05/25 14:09:34
ron washed a total of seven objects after eating his lunch. Two of the objects were pieces of china: a mug and a plate. two were piees of glassware: a water glass and a juice glass. three were utensils: a fork, a knife, and a spoon. ron washed the two pieces of china consecutively, the two glasses consecutively, and the t:
he washed each of the objects exactly once.
he washed the glassware after either the china or the utensils but not after both.
he washed the knife before the spoon, and he washed the mug before the plate.
he did not wash any two objects at the same time.

if ron washed the spoon immediately before the fork, then which one of the following statements can be true?
a. he washed the knife second.
b. he washed the knife third.
c. he washed the plate third.
d. he wahshed the plated sixth.
e. he washed the plate seventh.

我选的是b，但正确答案是e。 为什么呢？

答案就是E
有下列四种情况：
mpwjksf
mpjwksf
ksfwjmp
ksfjwmp
你自己再细看看题吧，是不是哪里理解有问题，这个题不算难题～
还有问题给我站内消息～

先看题干，是can be ture,就是说，可能正确的，而不是必然正确的。

从这句话中he washed the glassware after either the china or the utensils but not after both可以推出：(China or Utensil) Glassware (Utensil or China) 的顺序，即：(m/P) (W/J) Utensils 或者
Utensils （W/J) (M/p) 【/指代顺序可换】
又知：he washed the knife before the spoon, and he washed the mug before the plate.以及可以推出一共6种大致情况：
(m P) (W/J) （k f s) ; (k f s) （W/J) (M p)
(k s f) ; (k s f)
(f k s) ; (f k s)

ok！题干告诉我们，s在f的前面，就可以提炼出两种大致情况：
(m P) (W/J)(k s f) ； (k s f)（W/J) (M p)
这不很清楚了么？？看答案呗，A.K2 k只能在5或1，所以不可能在2；B.K3 同A；C.P3 P只能在2或7,所以不能在3； D.P6 同C；E.P7就可能正确而不必然正确，因为还有情况P可能在2，所以这就符合了题干的要求:Can be ture。