14-2-25

番茄炒蛋

14-2-25
25. Unless negotiations begin soon, the cease-fire will be violated by

one of the two sides to the dispute. Negotiations will be held only if

other countries have pressured the two sides to negotiate; an agreement

will emerge only if other countries continue such pressure throughout

the negotiations. But no negotiations will be held until international

troops enforcing the cease-fire have demonstrated their ability to

counter any aggression from either side, thus suppressing a major

incentive for the two sides to resume fighting.

If the statements above are true, and if negotiations between the two

sides do begin soon, at the time those negotiations begin each of the

following must also be true EXCEPT:

(A) The cease-fire has not been violated by either of the two sides

(B) International troops enforcing the cease-fire have demonstrated

that they can counter aggression from either of the two sides

(C) A major incentive for the two sides to resume hostilities has been

suppressed

(D) Other countries have exerted pressure on the two sides to the

dispute

(E) The negotiations'reaching an agreement depends in part on the

actions of other countries.

答案是a
可是原文的第一句话说的和问题里的if negotiations between the two sides

do begin soon两句相对应的话，a也好像是对的啊
谁能帮我把第一句翻译一下
我的理解是除非谈判立即开始，否则就会打起来

snow_mountain

你对第一句话的理解应该没错，不过你把必要和充分条件搞混了。

第一句话是这样推的：由 the two sides will not violate the cease-fire  推出 negotiation will begin soon.

已知negotiation will begin soon, 并不能推出two sides will not violate the cease fire.

番茄炒蛋

给自己举了一个例子，总算是想通了
谢谢bryony了

tianwan

unless := if not 即     not A unless B表达为：A→B fficeffice" />

                                                                                                         A unless B表达为：非A→B: 本题是：unless B, A.注意啊，这些公式必须要记住，不然会吃亏的。我这题就是作错了。看了bryony的解释后，赶紧查feifei手册。所以，《费费逻辑》是必看的！

ffice:word" />only if:         A only if B表达为A→B

if only:         A if only B表达为B→A

                                                 A is necessary to B：B→A

Whenever，whoever，wherever := if