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.
C为什么不对啊 可以看成是他因削弱啊
c是加强了。
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