the researchers' conclusion concerning the absence of demographic bias would be most seriously undermine if it were found that A the older an individual carnivore is ,the more likely it is to have a large number of tooth fractures D the mehods used to determine animals' ages in fossil samples tend to misidentify many older individuals as younger individuals
为什么选D 不选A?OG解释说A不是Undermine而是support。。。 没看懂原文里说 researchers dismissed demographic bias because older individuals were nor overrepresented in the fossils samples.这句话的意思 求达人解释………………