单项选择题

This passage mainly talks about ______.

A．the differences between the natural scientist and the social scientist
B．the functions of the natural sciences and the social sciences
C．the aim of the natural sciences and the social sciences
D．the differences between the natural sciences and the social sciences
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单项选择题
The natural scientist is not emotionally engaged with his subject matter because ______.
A．his subject matter is irrespective of variable conditions of time and place
B．his subject matter is indifferent to what is done to it, and ignorant of what has been learned about it
C．he is indifferent to what he does to his subject matter
D．he is ignorant of what he has learned about his subject matter
单项选择题
Paragraph 3 tells us that too much caffeine can result in ______.
A．uneven heartbeats
B．heart disease
C．hypertension
D．emotional illness
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