单项选择题

George Spilich's experiment was conducted in such a way as to ______.

A．compel the subjects to separate major information from minor details
B．put the subjects through increasingly complex tests
C．cheek the effectiveness of nicotine on smokers
D．register the prompt responses of the subjects
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单项选择题
Which of the following statements is true
A．Active smokers in general performed better than deprived smokers.
B．Active smokers responded more quickly than the other subjects.
C．Non-smokers were not better than other subjects in performing simple tasks.
D．Deprived smokers gave the slowest responses to the various tasks.
单项选择题
The purpose of George Spilich's experiments is ______.
A．to test whether smoking has a positive effect on the mental capacity of smokers
B．to show how smoking damages people's mental capacity
C．to prove that smoking affects people's regular performance
D．to find out whether smoking helps people's short-term memory
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