新人求助 如何复习

Try a few logical question I wrote for this forum and see how good you are.  For example, this one:

GMAT 逻辑分析题 (14)

Recently discovered prehistoric cave paintings on Diaoyu Dao, or Uotsuri Jima in Japanese, have archaeologists puzzled. The traditional theory about these cave paintings was that they were mostly a description of the favorite diets of the prehistoric painters. This “diet” theory cannot be right, because these painters must have needed to eat the animals populating the East China Sea if they were to make a living on the island and to sail across the East China Sea, but there are no paintings that distinctively depict these sea creatures in the cave.

Each of the following statements, if true, weakens the argument against the traditional theory about the cave paintings EXCEPT:

a) While living on the island, the cave painters hunted, caught, and ate land animals.
b) A significant part of the original cave paintings on the islands were lost during a tsunami.
c) The cave paintings that were recently discovered on the islands pictured many land animals.
d) The cave painters learned the Chinese traditional method of how to preserve meats.
e) These cave paintings on the island were completed by the original islanders who ate the meat of farmed land animals.