单项选择题

No case is on record of a ______ being ceasing to be ______ under cultivation.

A．variable,variant
B．variant,variable
C．varied,various
D．variable,variable
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单项选择题
External dangers usually enforce ______ harmony and subordination.
A．inside
B．inner
C．internal
D．interior
单项选择题
A．of courseB．thereforeC．indeedD．as such
A．of course
B．therefore
C．indeed
D．as such
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