单项选择题

By actual measurement ravens are the most percipient of birds, and on______evidence they seem more______than most other living creatures.

(A) anecdotal… cognizant
(B) reliable … contumelious
(C) preliminary … retiring
(D) subjective … sapient
(E) unavailable … intelligent
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单项选择题
The main idea of the passage is that()

(A) explanations of the process by which higher organisms explain themselves have remained elusive until now
(B) self-amplifying activation processes may one day explain most natural processes
(C) scientists have discovered the first proof of Turing patterns to higher organism communities
(D) explanations of how organisms organize themselves into patterns are no longer so elusive as they once were
(E) activation processes are essential to the survival of many ant species

单项选择题
Nathan was a fiercely ambitious and competitive man, as quick to take offence as to give it in his business dealings, and it is not difficult to imagine him responding ______to such______.
(A) mysteriously … an entreaty
(B) fractiously … a pleasantry
(C) self-effacingly … an invitation
(D) impetuously … a contretemps
(E) gravely … a leitmotif
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