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【简答题】
设函数f（x）=ax-（a+1）ln（x+1），其中a＞0． （Ⅰ）求f（x）的单调区间； （Ⅱ）当x＞0时，证明不等式： x 1+x ＜ln(x+1)＜x ； （Ⅲ）设f（x）的最小值为g（a），证明不等式：- 1 a ＜g(a)＜0 ．
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举一反三
【单选题】Senator Smart, who understands economic principles, is trying to convince workers in her district that trade with other countries is beneficial. Senator Smart should argue that trade can be beneficial
A.
only if it allows us to obtain things that we couldn't make for ourselves.
B.
because it allows specialization, which increases total output.
C.
to us if we can gain and the others involved in the trade lose.
D.
in only a limited number of circumstances because others are typically self-interested.
【简答题】旅游资源包括的范围很广，种类繁多，按照其形成的条件，可将旅游资源分为____旅游资源和人文旅游资源。
【简答题】农业生态旅游资源包括田园风光生态旅游资源、（）旅游资源和（）生态旅游资源等。
【单选题】It was a fixing sight: there, in the Capitol itself, a U.S. Senator often mocked for his halting, inarticulate speaking, reached deep into his Midwestern roots and spoke eloquently, even poetically, a...
A.
annoyed.
B.
amazed.
C.
agonized.
D.
agitated.
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