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  3. Recent studies of the Philippine fruit bat fauna have confirmed some previou

Recent studies of the Philippine fruit bat fauna have confirmed some previou

游客2025-02-19  29
问题     Recent studies of the Philippine fruit bat fauna have confirmed some previous hypotheses regarding bats on oceanic islands: for example, species richness [the number of different species in a particular area] and abundance are generally highest in the lowlands and decrease with increasing elevation. With few exceptions, each endemic species [species native to a particular place] is restricted to the modern islands that made up a single island during periods of low sea level, and genetic differentiation has been influenced by the ecology of the species and the current and past geographic and geological conditions. However, far more previous hypotheses have been overturned than supported. Some endemic Philippine species use disturbed habitat as extensively as nonendemic species that are widespread in Southeast Asia. Levels of genetic variation within all species are high, not low, and rather than showing evidence of an intrinsic vulnerability to extinction from natural causes, independent lineages of these bats have persisted in rather small areas for very long periods of time (often millions of years) in spite of frequent typhoons and volcanic eruptions. While colonization from outside areas has clearly contributed to the high species richness, speciation within the archipelago has contributed at least a quarter of the total species richness, including many of the most abundant species. [br] Which of the following can be inferred from the passage about the “recent studies”?
选项 A、They point to the need for a significantly revised perspective on oceanic island bats generally.
B、They were undertaken with the assumption that Philippine fruit bats were somewhat atypical among oceanic bats.
C、They remain somewhat controversial among researchers because of the number of standard hypotheses that they tested.
D、They have largely confirmed what scientists thought about the Philippine fruit bat.
E、They suggest that bats on oceanic islands are more vulnerable to extinction than previously thought.
答案 A
解析 因为很多都被最近的研究推翻了，因此需要修正观点，正确。B项文中没提atypical。C项文中未提及。D项largely程度太强。E项根据第五句，该项内容表述相反。
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