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【简答题】
已知函数f(1+x)是定义域为R的偶函数, f(2)= , f'(x)是f(x)的导函数,若 x∈R, f'(x) 的解集为________________.
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反馈参考答案：
举一反三
【单选题】________ animals are in danger and there will be ________ space for them if we don’t take any actions.
A.
More and more, more and more
B.
More and more, less and less
C.
Less and less, less and less
D.
Less and less, more and more
【单选题】We started off ______ Sunday noon, and arrived there ______ sunset.
A.
at, at
B.
on, at
C.
on, on
D.
at, in
【单选题】David was always ______ his best in any danger, but at that moment he froze.
A.
at
B.
in
C.
for
D.
on
【简答题】Who can you turn to in time of er, it not ______. A) any B) us C) we D) ours
【单选题】The police started off to search for the_______ boy after they received the call from the parents.
A.
missing
B.
miss
C.
missed
D.
missed
【单选题】No sooner had they got off the train__________ it started moving．A.whenB.than###
A.
No sooner had they got off the train__________ it started moving． A.when
B.
than
C.
then
D.
after
【单选题】'The child's life is not in danger any more,'the doctor said ________. [ ]
A.
in service
B.
in relief
C.
in peace
D.
in charge
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