两道GMAT逻辑题求大神解答~~

jingqixiang10

1.Prolonged and unseasoned frost produce frost rings in deciduous trees, which grow in moderate climates. Frost rings do not appear in any of the fossilized deciduous trees that have been found in Antarctica. Hence, it is unlikely that such frosts occurred in Antarctica at the time the fossilized trees lived.
which of the following is an assumption on which the arguement depends?
A There are fossilized nondeciduous trees from Antarctica that bear frost  rings.
B Deciduous trees are more likely to bear frost rings than are other tree varieties.
C The process of fossilization does not completely obscure frost rings in deciduous trees.
D Present-day deciduous trees are more sensitive to changes in temperature than were the deciduous trees of ancient Antarctica.
E Prolonged and unseasonable frosts that might have occurred in Antarctica when the now-fossilized trees were still living did not always produce frost rings in deciduous trees.

2.The program to control the entry of illegal drugs into the country was a failure in 1987. If the program had been successful, the wholesale price of most illeagal drugs would not have dropped substantially in 1987.
The arguement in the passage depends on which of hte following assumpions?
A The supply of illegal drugs dropped substantially in 1987.
B The price paid for most illegal drugs by the average consumer did not drop substantially in 1987.
C Domestic production of illegal drugs increased at a higher rate than did the entry of such drugs into the country.
D The wholesale price of a few illegal drugs increased substantially in 1987.
E A drop in demand for most illegal drugs in 1987 was not the sole cause of the drop in their wholesale price.

arthur124

1. C和2. E？？？？求正解

jingqixiang10

arthur124 发表于 2013-4-2 16:49
1. C和2. E？？？？求正解

对的，楼上讲讲怎么解题的思路呀？

angelica812

价格下降可以是因为需求降低，或supply increase。。。。e选项是需求降低；c选项是供应增加。
为啥c不可以选呢？