单项选择题

The earth moves around the sun.

A．before
B．round
C．after
D．over
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单项选择题
These are the motives for doing it.
A．reasons
B．excuses
C．answers
D．replies
单项选择题
The Constitution's vague nature has given it the flexibility to be adapted when circumstances change.
A．imprecise
B．apparent
C．clear
D．easy
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