試題詳解

79. According to the results of the study mentioned in the passage, what is true？
(A) Two monkey species were selected because of the size of their brain.
(B) The injection of a transneuronal tracer makes it possible to track neuronal circuits.
(C) M1 is the only controlling factor in a monkey’s complex speech.
(D) Human complex speech abilities may be due to the cricothyroid muscle.