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
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单项选择题
He promised to return the book the next day without ______ .
A．fail
B．default
C．trouble
D．failure
单项选择题
______ allowing for his age, he still acts very immaturely.
A．But
B．Yet
C．Although
D．Even
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