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（本题满分15分）已知函数 . （Ⅰ)当 时，求函数 的单调区间; （Ⅱ）是否存在实数 ，使得函数 有唯一的极值，且极值大于 ？若存在，,求 的取值 范围；若不存在，说明理由； （Ⅲ）如果对 ，总有 ，则称 是 的凸 函数，如果对 ，总有 ，则称 是 的凹函数.当 时，利用定义分析 的凹凸性，并加以证明。
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举一反三
【单选题】— What did you say? — So you _____________ to me. [ ]
A.
won't listen
B.
didn't listen
C.
haven't listened
D.
weren't listening
【单选题】She maintained a calm appearance,though really she was furious.
A.
expose...to
B.
adhere to
C.
reversed
D.
exposure
E.
handle
F.
take liberty with
G.
adolescence
H.
lay hands on
I.
exterior
J.
individual’s
【单选题】If you that movie last night, you wouldn't be so sleepy. [ ]
A.
haven't watched
B.
hadn't watched
C.
didn't watch
D.
wouldn't have watched
【单选题】Edward, you play so well, but I you played the piano.
A.
don’t know
B.
hadn’t know
C.
didn’t know
D.
haven’t known
【单选题】---So you haven't read the information form? ---_________makes the matter worse is that I don't have a single copy．
A.
It
B.
What
C.
That
D.
Which
【单选题】You haven’t read the new book that has been so highly acclaimed yet, ______?
A.
haven’t you
B.
has it
C.
hasn’t it
D.
have you
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