单项选择题

The word "paradox" ( Para. 1 ) means" ______ ".

A．implication
B．contradiction
C．interpretation
D．confusion
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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
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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