题目信息
Biologist: Species with broad geographic ranges probably tend to endure longer than species with narrow ranges. The broader a species' range, the more likely that species is to survive the extinction of populations in a few areas. Therefore, it is likely that the proportion of species with broad ranges tends to gradually increase with time.
The biologist's conclusion follows logically from the above if which of the following is assumed?
The biologist's conclusion follows logically from the above if which of the following is assumed?
A:There are now more species with broad geographic ranges than with narrow geographic ranges.
B:Most species can survive extinctions of populations in a few areas as long as the species' geographic range is not very narrow.
C:If a population of a species in a particular area dies out, that species generally does not repopulate that area.
D:If a characteristic tends to help species endure longer, then the proportion of species with that characteristic tends to gradually increase with time.
E:Any characteristic that makes a species tend to endure longer will make it easier for that species to survive the extinction of populations in a few areas.
参考答案及共享解析
共享解析来源为网络权威资源、GMAT高分考生等； 如有疑问，欢迎在评论区提问与讨论
本题耗时：
已选答案：
正确答案：
D:If a characteristic tends to help species endure longer, then the proportion of species with that characteristic tends to gradually increase with time.
答案D
题目大意：生物学家，地理范围较广的物种可能比范围较窄的物种存活时间更长。一个物种的范围越广，该物种越有可能在少数地区的种群灭绝中幸存下来。因此，宽范围物种的比例可能会随时间逐渐增加。
题目逻辑：选择的选项应该要能论证“宽范围物种的比例可能会随时间逐渐增加。”，也就是描述时间变化的不同。
A.只描述了现在分布，未描述时间变化的不同，不是个好选项。
B.未描述时间变化，不是个好选项。
C.未描述时间变化，不是个好选项。
D.该选项说，如果某个特征倾向于帮助物种生存更长的时间，则具有该特征的物种的比例往往会随时间逐渐增加。描述了时间变化中数量增长的情况，是正确的。
E.未描述时间变化，不是个好选项。
题目大意：生物学家，地理范围较广的物种可能比范围较窄的物种存活时间更长。一个物种的范围越广，该物种越有可能在少数地区的种群灭绝中幸存下来。因此，宽范围物种的比例可能会随时间逐渐增加。
题目逻辑：选择的选项应该要能论证“宽范围物种的比例可能会随时间逐渐增加。”，也就是描述时间变化的不同。
A.只描述了现在分布，未描述时间变化的不同，不是个好选项。
B.未描述时间变化，不是个好选项。
C.未描述时间变化，不是个好选项。
D.该选项说，如果某个特征倾向于帮助物种生存更长的时间，则具有该特征的物种的比例往往会随时间逐渐增加。描述了时间变化中数量增长的情况，是正确的。
E.未描述时间变化，不是个好选项。
加入收藏
在线答疑
题目来源
