单选题
According to the author, a key factor in the ability to reason is ______.
A、
the subject's knowledge of grammar
B、
the amount of sleep the subject has had
C、
the level of arousal of the subject
D、
the extent to which the subject has been taught to mason
【正确答案】
C
【答案解析】
由最后一段最后一句“when short of sleep they raised their arousal level and better at…”可知缺少睡眠能提高医生的警觉性，从而使推理能力提高，所以选C。
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