单项选择题

When a typist gets tired, ______.

A．she has to try hard to raise her automatic
B．she can type only automatically
C．she cannot think about what she is doing
D．she can seldom type automatically

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单项选择题

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