单项选择题
We know less about the astronomical universe than we do about any social system because ______.
- A．theories of its origin and history are varied
B．our knowledge of it is highly insecure
C．only a very. small sample of it has been observed
D．few scientists are involved in the study of astronomy
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相关考题
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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 -
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.
