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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单项选择题
Her speciality is heart surgery.
A. region
B. site
C. field
D. platform
单项选择题
I don’t quite follow what she is saying.
A. observe
B. understand
C. explain
D. describe
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