单项选择题

Flag Day is a legal holiday only in the state of Pennsylvania, ______ Betsy Ross sewed the first American flag.

A．which
B．where
C．that
D．has
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单项选择题
By cutting down trees we ______ the natural habitat of birds and animals.
A．damage
B．injure
C．hurt
D．harm
单项选择题
The vast majority of people in any given culture will ______ to established standards of that culture.
A．confine
B．conform
C．confront
D．confirm
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