单选题The primary topic of the passage is which of the following?AThe origin of bioluminescence in plankton predatorsBThe disadvantages of bioluminescence in microorganismsCThe varieties of marine bioluminescent life formsDSymbiotic relationships between predators and their preyEHypotheses on the causes of bioluminescence in plankton
单选题
The primary topic of the passage is which of the following?
A
The origin of bioluminescence in plankton predators
B
The disadvantages of bioluminescence in microorganisms
C
The varieties of marine bioluminescent life forms
D
Symbiotic relationships between predators and their prey
E
Hypotheses on the causes of bioluminescence in plankton
参考解析
解析：
作者在文中第二句先表明水下微生物普遍发光的原因“remains obscure, and suggested explanations are controversial”，接着详细阐述了一些相关的假想，因此E项概括出了文章的主旨，最符合题目要求。
作者在文中第二句先表明水下微生物普遍发光的原因“remains obscure, and suggested explanations are controversial”，接着详细阐述了一些相关的假想，因此E项概括出了文章的主旨，最符合题目要求。
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