单选题
It can be inferred that researchers abandoned the presynaptic hypothesis because______ .
A、
a new and more attractive hypothesis was suggested
B、
no research was reported that supported the hypothesis
C、
research results provided evidence to counter the hypothesis
D、
the hypothesis was supported only by studies of animals and not by studies of human beings
【正确答案】
C
【答案解析】
从第三段的实验结果知道contrary to their expectations，即结果与他们事先的预想相反，故选C。
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