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 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 passengers, is on.
答案B没有问题。可觉得D也可以削弱啊，从除霜口排出的温暖气体很快就冷却了，说明也不是因为defrosting vent的功效使得前挡风玻璃上的霜融化。 这里有一个问题，defrosting vent是通过排出的气体来除霜的吗？
D的意思是除霜口排除的风很快就冷却了
文章的结论：因为有这个除霜口的风，挡风玻璃上的冰很快就融化了
B说的是其他没有除霜口的风的地方的冰也很快就融化了，除霜口的风不是原因。
D和结论没有什么关系。冷却的快不能解释什么。cool和condensed是不一样的概念。
谢谢版版，D我今天又想了一天还是没有想通呢。题目说因为除霜口的风，挡风玻璃上的冰很快就融化了。
但这风是热的才能融化冰吧，现在它很快就冷却了，说明有可能不是因为这个风，而是汽车发动了本身产生的热量让冰融化的呢？
汗，我也觉得是不是再钻牛角尖阿
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