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【简答题】
设函数f（x）=xsinx（x∈R）， （Ⅰ）证明f（x+2kπ）-f（x）=2kπsinx，其中k为整数； （Ⅱ）设x 0 为f（x）的一个极值点，证明 ； （Ⅲ）设f（x）在(0，+∞)内的全部极值点按从小到大的顺序排列a 1 ，a 2 ，…，a n ，…，证明 。
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【多选题】下列各点中，能表明1912年成立的南京临时政府是一个资产阶级共和国性质的革命政权的是：()。
A.
资产阶级革命派在这个政权中占有领导和主体的地位
B.
它制定的政策集中代表和反映了中国民族资产阶级的愿望和利益
C.
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D.
它没有提出任何可以满足农民土地要求的政策和措施
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【判断题】If free trade is allowed and a country exports a good, domestic producers of the good are worse off and domestic consumers of the good are better off when compared to the before-trade domestic equilib...
A.
正确
B.
错误
【单选题】For better or worse, listening to an audio book almost always feels like a shared experience. I feel myself not merely a passive audience but engaged in a kind of exchange. Readers are not reading to ...
A.
suggest that unconscious expressions often betray one’s true opinions
B.
assert that listening to audio books is enjoyable regardless of the reader's speaking ability
C.
imply that some audio-book readers have surprisingly poor speaking skill
D.
argue that a speaker's vocal inflections can obscure the author's intended meaning
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