单选题
By actual measurement ravens are the most percipient of birds, and on______evidence they seem more______than most other living creatures.
A、
(A) anecdotal… cognizant
B、
(B) reliable … contumelious
C、
(C) preliminary … retiring
D、
(D) subjective … sapient
E、
(E) unavailable … intelligent
【正确答案】
D
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