单项选择题

Astronomers were happy to know that their ______ a bout stars in the universe were correct.

A．philosophy
B．assumptions
C．descriptions
D．consumptions
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单项选择题
It is clear that lack of education will greatly ______ the laid-off workers from getting a job again.
A．hamper
B．confuse
C．perplex
D．reverse
单项选择题
The old Roman walls may still be seen, but not in their ______.
A．integrity
B．compactness
C．installment
D．flexibility
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