原题
Though previous studies, including work by Varela et al. (2012), have documented that wood density correlates negatively with resistance to water stress in angiosperm taxa, Nguyen et al. (2018) observed no such associations among Mauritian woody angiosperms. Nguyen et al. noted that while several earlier studies included a variety of habitats—wet and dry forests, savannas—and thus comprised plants with a wide range of functional trait values, the Mauritian investigation was restricted to rainforest taxa occupying climatically similar habitats, resulting in constrained ranges of such values.
Which choice best states the main purpose of the text?
ATo describe a study whose results demonstrate that a known relationship between two functional traits in angiosperms cannot be observed when sampling is restricted to homogeneous habitats
BTo explain the apparent absence of a previously observed association between two functional traits in angiosperm species sampled from an ecologically homogeneous set of habitats
CTo clarify why a geographically restricted study invalidated the finding that angiosperm species exhibit a trade-off between wood density and water-stress resistance
DTo indicate that wood density and water-stress resistance correlations in angiosperms vary significantly depending on the geographic region and climate conditions studied
正确答案：B
解题思路
老师暂未填写解题思路。