单项选择题

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

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单项选择题

Which of the following statements about W. E. B. Du Bois does the passage best support（）

A． He sacrificed the proven strategies of earlier black leaders to his craving for political novelty.
B． Preferring conflict to harmony, he followed a disruptive course that alienated him from the bulk of his followers.
C． He proved unable to change with the times in mounting fresh attacks against white racism.
D． He relied on the fundamental benevolence of the white population for the eventual success of his movement.
E． Once an adherent of Washington's policies, he ultimately lost patience with them for their inefficacy.

单项选择题

It can be inferred that Booker T. Washington in comparison with W. E. B. Du Bois could be described as all of the following EXCEPT（）

A． submissive to the majority
B． concerned with financial success
C． versatile in adopting strategies
D． traditional in preaching industry
E． respectful of authority