atongmu

楼主请注意：以后发贴提问请把题目贴上，便于别人解答和参考。

atongmu

19.B的结论是：trees growing in the Pazyryk Valley have annual rings that are quite distinct from trees growing in nearby valleys. 根本和判断age无关的说。

atongmu

18.D， Practicing veterinarians have a professional obligation to strive to prevent the unnecessary death of an animal except in cases of severely ill or injured animals whose prospects for recovery are dim.  扩大推理范围，提干无法推出狗死是unnecessary death of an animal。

这种题目在gmat中应该不会考。