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（本小题共13分） 已知函数 R）． （Ⅰ）求函数 的定义域，并讨论函数 的单调性； （Ⅱ）问是否存在实数 ，使得函数 在区间 上取得最小值3？请说明理由．
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A.
that
B.
which C what D. how
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A.
which are
B.
they are
C.
that is
D.
what is
【单选题】. Some animals are in danger, and the scientists are doing ___ they can ___ them.
A.
that; to save
B.
whatever; to save
C.
what; save
D.
the thing; save
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