单项选择题

The word "paradox" ( Par

A．1, Line 1 ) means" ______ ".A. implicationB. contradictionC. interpretationD. 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 information in paragraph 5 indicates that PCPA was responsible for ______.
A．a lack of sleep
B．the cats' meowing
C．normal sleeping patterns
D．sleeping about 15 hours a day
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