单项选择题

The author believes that our knowledge of social systems is more secure than that of physical systems because ______.

A．it is not based on personal experience
B．new discoveries are less likely to occur in social sciences
C．it is based on a fairly representative quantity of data
D．the records of social systems are more reliable
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单项选择题
Which of the following statements is true
A．The men in Samoa were not quite blind.
B．A girl called Virginia could read newsprint even when she was blindfolded.
C．Rosa' s ability to see was confined to her fingers.
D．The result of the last test on Rosa was least doubtable.
单项选择题
Which of the following makes the demonstration most persuasive
A．To read through glass, blindfolded.
B．To identify the color and shape of light on a screen while securely blindfolded.
C．To carry out the test with someone pressing on her eyeballs.
D．To work from behind a screen, blindfolded and with a card round her neck.
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