这两道题 我想了很久，就是解释不了，各位怎么想呢？？
8. Artificial seaweed made of plastic has been placed on a section of coast in order to reverse beach erosion. The inventor of the seaweed has concluded that the recent buildup of sand on that section of coast proves that the artificial seaweed reverse beach erosion
Which of the following， if true， would most seriously weaken the inventor's conclusion?
(A) The amount of recent sand buildup on that section of coast was less than had been predicted on the basis of the results obtained in controlled experiments.
(B) Because artificial seaweed would be buried eventually by additional sand deposits on the coast， more artificial seaweed would need to be put in place every four years.
(C) Artificial seaweed of another material which had been previously developed by the inventor failed to add sand to coastline in past trials.
(D) The amount of recent sand buildup on that section of coast is the same as the amount of recent sand buildup on otherwise very similar section of coast without artificial seaweed.
(E) The amount of recent sand buildup on that section of coast， although considerable， is not yet enough to replace the amount lost during storms on that section of coast in the last twenty years.
这道题的P是不是. Artificial seaweed made of plastic has been placed on a section of coast in order to reverse beach erosion
C是不是the recent buildup of sand on that section of coast proves that the artificial seaweed reverse beach erosion
呢？这道题给我的感觉好像结论证实了P，把P重复了一下的感觉
为什么选择D呢？
1.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 rates 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 through out 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
这道题题目中有because，明显之后内容“有风吹”是P，但是问题中explanation（一般都是解释的是现象，而非结论）似乎又提示“冰融化的快”才是P，而“有风吹”是C，怎么办呢？
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发表于 2012-7-12 22:40:32
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