[求助] OG-7

the ice on the front windshield of the car had formed when moisture condensed during the night. the ice melted quickly after the car was warmed up the next morning because the defrosting vent, which blows only on the front windshield, was turned on full force.

which of the following, if true, most seriously jeopardizes the validity of the explanation for the speed with which the ice melted?

A the side windows had no ice condensation on them

B even though no attempt was made to defrost the back window, the ice there melted at the same rate as did the ice on the front windshield

C the speed at which ice on a window melts increases as the temperature of the air blown on the window increases

D the warm air from the defrosting vent for the front windshield cools rapidly as it dissipates throughout the rest of the car

E the defrosting vent operates efficiently even when the heater, which blows warm air toward the feet or faces of the driver and and the passengers, is on

我不太理解题目的意思，也不清楚这道题是哪种类型，请大虾耐心为莱鸟讲解分析一下题意和答案

题干：“defrosting vent”因

           “the ice melted quickly ”果

答案B：在无“defrosting vent”情况下，也出现了“the ice melted quickly ”

所以题干中的因果关系不正确

这个题是什么题型呀？

因果关系？削弱？

我不知道这种weaken题怎么做

找因果关系？

我是看问题，看它是要weaken什么。

是weaken conlcusion呢，还是premises。

然后在题目中找到相应的部分，去weaken它就好了。

姐姐看看lawyer的帖子吧。

http://forum.chasedream.com/dispbbs.asp?BoardID=24&ID=74525

谢谢妹妹

我仔细琢磨琢磨。。。